How to foam with polyurethane foam correctly. Is it justified to use polyurethane foam without a gun, or is it still worth purchasing one?

IN modern world used in almost all types of repair and construction work. It is used during the installation of doors, windows and window sills, and plumbing fixtures. This building material has also found wide application as insulation - it is used to seal cracks and cracks, sandwich panels and various insulation materials are made from it.

The main advantage of polyurethane foam is its convenience and ease of use.

Types of polyurethane foam

In order to figure out how to use it correctly polyurethane foam, let's look at its varieties. Today, modern industry produces three types of this material: professional and household cylinders, as well as two-component polyurethane foam (we will not consider it in this article, since it is used only in production conditions). What is their difference? Which type should you prefer? How to use a balloon with polyurethane foam The main criterion for choosing this material is its purpose.

Foam for professional use (gun)

This material is sold in cylinders starting from 1.5 liters and is distinguished by the fact that it can only be used with the help. It is used, as a rule, by professional builders, since this design allows the work to be done easily and quickly.

Using a gun makes dosing the material much easier. For one-time work in living conditions the material is not very convenient, because after use you need to wash the gun, and this is an additional financial cost. There are manufacturers that complete the cylinders with a spray tube. But applying professional foam from it is not economical, since strong pressure increases its consumption.

Foam for household use

Sold in tubes with a capacity of 0.6-0.8 liters and equipped with a straw. It is intended for one-time use. Convenient to fill small spaces and corrections of various installation defects. Household polyurethane foam has the same properties as for professional use. The kit must include a tube. If necessary, you can use both a cylinder and a gun.

The cost of professional foam is much higher than household foam, and this is mainly due to the difference in their volume.

Pistol design

Before learning how to use a spray foam can, first let's look at the design of the gun. Regardless of manufacturer? its structure is the same and quite simple:

• If household foam is supplied through a PVC tube, then in a gun it is supplied through a metal tube with a special tip - a nozzle. The tip hole is 5 times smaller than the cross-section of the supply tube, due to which it increases operating pressure mixtures.
• The cylinder is connected through an adapter, which is attached to the gun body.
• The purpose of the adjusting screw is to dose the mixture output.
• The handle of this tool can be made of aluminum or plastic. It is attached to the barrel with a nut. Thanks to collapsible design The gun is easy to clean from frozen residues.
• The trigger is used to supply the mixture from the cylinder.

How to install a cylinder on a pistol

In order to learn how to properly use a foam gun, let’s first consider how to insert it:

• The first thing to do is to warm up the foam container in hot water to room temperature and shake thoroughly for 20-25 seconds to bring the polyurethane foam substance to a homogeneous state. The foam will come out with a uniform consistency and in full volume.

• The container is closed on top with a protective cap, which must be removed before installation. Then place the gun with the handle down. When connecting, hold the device firmly by the handle with one hand, and screw the cylinder onto the adapter with a rotational movement with the other. Evidence of connection will be hissing, which indicates the arrival of foam. If there is no sound, this indicates a malfunction of the inlet ball valve or the expiration date of the foam itself. To fix this problem, the gun will have to be disassembled and cleaned of dried old material.
• After shaking, the device is placed in working position handle down. The adjusting screw is turned a quarter turn and the trigger is pulled, pointing the barrel into the bag. When the consistency of the foam is normal, start working.

Polyurethane foam: how to use a spray can with a gun?

Working with polyurethane foam does not require any special skills. It will be enough to try to foam something once or twice, and everything will work out. Let's consider the order of work and some nuances:

Polyurethane foam is sensitive to ultraviolet rays material that is destroyed under their influence, changes color and crumbles. If used outdoors, then after complete drying and removal of excess, you need to cover it with cement mortar.

How to use polyurethane foam with a tube?

If a gun is not provided for the cylinder (in household foam), then instead the kit includes a PVC tube that is screwed onto the adapter. The operating principle is identical to professional foaming. It is not always convenient to work with such a cylinder, but it is great for one-time use. This option will be ideal in a situation where you plan to seal small seams.

So, what are the disadvantages of polyurethane foam? We have already figured out how to use it. Now let's look at the disadvantages of this material:

• It is impossible to dose the contents of the container, which increases the consumption of polyurethane foam.
• Inconvenience of working with this tool. Holding the balloon upside down by hand is quite tiring and even uncomfortable. The hand often gets tired and constant breaks are needed.

Using polyurethane foam without a gun or tube

Sometimes professional polyurethane foam can be used without a gun. How to use the balloon? In this situation, you will have to choose a tube to release the foam yourself and figure out how to press the valve. This process can be represented figuratively as follows: you need to release the air so that all of it can get to the desired point without getting caught in your hands.

In this case, choose a tube of 3 parts: the first and third are flexible, and the second is hard. The middle part presses the valve, the first prevents the foam from spraying, and the third brings it to the treatment site.

Conclusion

So, we examined polyurethane foam. We also studied how to use such material. But do not forget about protecting your hands and face, since the foam is quite difficult to wash off. It is much cheaper to buy an extra pair of gloves than to buy solvent or walk around with dirty hands.

Polyurethane foam can act as a sealant and thermal insulation material. It can be used when installing various window and door structures, and when carrying out various types of repair work. With its help, the tightness of structures is restored, cracks and joints are sealed.

Polyurethane foam is sold in aerosol cans, which must be shaken before use. Immediately after application, the substance begins to harden, resulting in a yellowish-colored material. The material is lightweight and has good thermal insulation and sound insulation characteristics. Depending on the manufacturer's recommendations, foam can be used indoors and outdoors.

Conventional polyurethane foam has a number of positive characteristics:

• Resistance to moisture, providing thermal insulation and sound insulation properties.
• Possibility of using sealant when installing electrical equipment due to low current conductivity.
• Resistance to fire (special fire-fighting types of polyurethane foam).
• A significant increase in volume immediately after leaving the can, filling distant microcracks located in hard-to-reach places.
• Possibility of gluing various homogeneous and dissimilar materials.
• Environmental friendliness, absence of toxic substances in the composition, chemical inertness.

Before using polyurethane foam and applying it to surfaces, it is recommended to check its performance characteristics on the packaging. Typically, the packaging indicates the volume of the substance after leaving the cylinder, the viscosity level and other characteristics.

Release form

Manufacturers produce polyurethane foam in different forms and types. The choice will depend on the intended use and operating conditions of the sealant.

It is customary to distinguish:

• Professional polyurethane foam, which is produced in special large cylinders that must be inserted into a gun to spray the substance. Using a gun, economical consumption of sealant is ensured. Used by builders when carrying out large volumes of work.

• Household polyurethane foam, which comes with a tube (it is usually used to foam cracks, joints, and gaps). Designed for household use for minor repairs and gluing surfaces.

Also, the can of polyurethane foam must indicate the recommended temperature conditions for using the sealant. There are summer, winter and universal (all-season) polyurethane foam. When purchasing, it is recommended to pay attention to the flammability class of the material (B1 - fire-resistant materials, B2 - self-extinguishing materials, B3 - combustible materials).

Scope of application of polyurethane foam

Conventional foam cylinders, which are sold in hardware stores, are used in the installation of door and window structures, as well as in the installation of electrical equipment and pipes.

The sealant has a sufficient level of thermal insulation characteristics so that it can be used to seal gaps and cracks in heating systems, defects in roof thresholds, and also provide partial insulation of ceiling, floor, wall structures and floors. It is also often used to secure Wall panels and polymer boards on the rough surface, which allows for decorative and waterproofing functions.

Polyurethane foam is used to treat the external surfaces of metal baths (made of steel or cast iron), which reduces the heat transfer of the metal.

If we talk about how to properly use polyurethane foam and how to work with it, then you need to clarify whether a gun is used or not. If you plan to carry out a full renovation of your home, you will have to use both professional and household foam to foam joints, seams, gaps, and install windows and doors.

Related article: How to disassemble a spray foam gun - diagram of the gun, disassembly instructions

You can install the gun on professional sealant as follows:

1. First, the canister with the substance needs to be warmed up a little in warm water up to 20-25 degrees. Then you need to shake it several times so that the substance becomes as homogeneous as possible and comes out of the can smoothly and easily.
2. At the top of the gun, you need to remove the protective cover, then turn it with the handle down and screw on the can of sealant. You need to screw it in until a characteristic hissing sound appears, which will indicate the beginning of the substance entering the gun.
3. If the gun is not new and has already been used, then it is necessary to inspect it before screwing in the can so that it is washed thoroughly. If after screwing in there is no hissing, then the gun is dirty and you need to buy a new one.
4. Before starting to work with polyurethane foam, according to the rules, you need to shake the gun with the cylinder again, turn the adjusting screw ¼ turn and, holding the trigger, begin processing.

To work with a gun, there is no need to have any skills and abilities in the field of construction and installation work. Work is usually performed in the following sequence:

1. The first step is to clean the surface where the sealant will be applied to remove dirt, and then moisten it with water from a spray bottle to ensure good adhesion.

4.If the surface to be treated is wide, you need to fill it with zigzag movements, but no more than 1/3 of the volume, because the polyurethane foam will increase in size.

5.If there are any untreated areas left, they can be filled in later.

If it is necessary to carry out processing in remote areas, it is recommended to additionally purchase a special extension hose, since foam hard to reach places polyurethane foam without its use is unlikely to work.

The can usually indicates how long it takes for the composition to harden. Despite the instructions, it is recommended to wait 10-12 hours. Once the sealant has completely cured, you can remove the excess using a knife or saw.

When using household sealant, there is no provision for a gun. It’s okay if the polyurethane foam comes without a gun, since you can use it with a straw. The tube is made of polymer materials - you just need to put it on the adapter. The work is performed in the same sequence as in the case of a gun, but when using a tube you will have to put in more effort.

You can easily use polyurethane foam without a gun if you have the appropriate tube. But in construction stores, the sealant can be sold without a tube (cheap models), so you will have to purchase it separately. You should also pay special attention to this when choosing suitable polyurethane foam.

The use of a tube is relevant if a small amount of work is expected to be performed. It is recommended to use polyurethane foam with a tube if you need to fill joints, gaps, seams, or glue different materials. Household sealant is rarely used when constructing door and window structures or when treating surfaces large area. For thermal insulation and sound insulation, you should also choose professional analogues.

On video: Using polyurethane foam without a gun.

Disadvantages of applying polyurethane foam without using a gun

Using a gun when applying sealant is a guarantee of uniform release of material from the container, the possibility of saving substances, and full control over surface treatment.

Related article: How to use a spray foam gun? Instructions for use for beginners

If ordinary household polyurethane foam is used in a package with a tube, then the workflow will have certain disadvantages. The most notable of them are:

1. Significant consumption of sealant. Overflow occurs because the user must exercise control over the intensity and duration of pressing the valve. It is quite difficult to do this over a long period of time, so almost always when processing using a tube, an excess volume of polyurethane foam appears, which leads to significant overruns. Professional sealant using a gun is usually consumed 1.5-2 times slower. This leads to small but noticeable financial costs (especially if a large amount of work is expected to be carried out).
2. If you purchased a professional sealant, then there is a high probability that it will not be possible to use a regular tube that is suitable for household polyurethane foam. The can simply will not release sealant. This point must be clarified when purchasing the material.
3. Using polyurethane foam without a gun is much more difficult than with one. The tubes are made from polymer material, therefore they are flexible - they are more difficult to hold in the desired position for a longer period than a pistol.

At the same time, there is no point in purchasing professional polyurethane foam or a gun for applying it if you intend to carry out minor repair work: fill gaps, seal joints and cracks between slabs, in thermal insulation material. In this case, you need to buy a household sealant with a tube, use it once and throw it away.

To carry out home and household repair work, one can of polyurethane foam is enough. If all the work has been completed, the cylinder is usually thrown away as unnecessary, because after opening the substance has a limited shelf life.

Manufacturers of household polyurethane foam note that their products are designed for single use. Therefore, if, several months after the first use, the sealant in the cylinder has frozen, you need to understand that this is a completely natural process.

You can give following tips for those people who are working with polyurethane foam for the first time:

1. Before starting work, it is recommended to first prepare a spray bottle with water and a knife to remove excess sealant (this is done after the applied composition has hardened).
2. It is also recommended to stock up on a regular sponge and acetone (or a similar solvent) in advance. They will be needed if you need to wipe off sealant that accidentally gets on other surfaces (for example, on the floor or on clothing).
3. You should not try to remove excess polyurethane foam immediately after application - this should be done approximately 8-10 hours after treatment. During this period, the sealant will harden, so it can be easily cut with a sharp knife or hacksaw.
4. If wallpapering has not been done in the room, then it is strongly recommended to carry out work on applying polyurethane foam (regardless of the volume of material sprayed), systematically ventilating the room.
5. If during the application process the sealant begins to gradually darken, this will indicate that the substance is exposed to ultraviolet radiation (direct sunlight). This kind of thing should be excluded when carrying out work.
6. It is strictly forbidden to treat surfaces with polyurethane foam if they are located in close proximity to open fire or hot objects. Regardless of the type, the sealant almost always contains flammable substances in its composition, which, in an uncured state, are quite capable of flaring up if suddenly exposed to an open flame.
7. Before starting work, it is necessary to clean the surface to be treated as thoroughly as possible. If it is dirty and greasy, then the polyurethane foam will not meet the characteristics specified on the packaging during operation.

Related article: Rules for use and technical characteristics of polyurethane foam

Is it possible to use a can of polyurethane foam several times?

You can find information on the Internet that professional polyurethane foam can be used repeatedly, while household models are only suitable for one-time use.

This is a common misconception, because if you use household foam, then after using it you can clean the nozzle, remove the tube and block the exit hole for the substance. To be able to use the sealant again, it is recommended to do everything in the following sequence:

1. It is necessary to release a little of the polyurethane foam from the can, and, allowing it to come out, bend the tube and tighten it with metal wire. At the end of the tube, the sealant will begin to harden, but the presence of a bend will not allow the entire volume of the substance that remains in the cylinder to harden.
2. When subsequently applying polyurethane foam, you simply need to cut off part of the tube with the frozen substance and continue to treat the gaps and seams with sealant.

It should be taken into account that a container with sealant can be stored in this way for 2-3 weeks and no more. After several months of storage, the substance will almost completely harden and harden inside the package, so it will not be possible to use it again.

Is it possible to use expired polyurethane foam?

Regardless of the type of sealant chosen, the shelf life of the substance usually does not exceed 1-1.5 years from the date of production. At the same time, if during its use a delay of several days or weeks was discovered, then you should not curtail the work - most likely, the polyurethane foam has not lost its basic operating and performance characteristics.

If the expiration date is significantly exceeded, it is strongly recommended not to use the sealant even for minor household repairs (especially for installing windows or doors). This is due to the fact that after the expiration date, the sealant begins to rapidly lose its basic properties, so when you open the package, anything can happen.

Terms of use of polyurethane foam after application

Leading sealant manufacturers claim that high-quality polyurethane foam, which has been applied to the surface in accordance with all the rules, is protected from ultraviolet exposure and moisture, and is capable of performing all its functions for 10-20 years.

If the applied substance is exposed to negative operating conditions: outdoors, in direct sunlight, rain, snow, etc., then the service life of the sealant is reduced to 2-3 years (even in cases where moisture-resistant compounds were applied).

Conclusion

Professional and household polyurethane foam - both materials have a right to exist, because they usually have different areas and features of use. For small home repairs, household models with a tube for applying the substance are quite suitable, but for large-scale work, it is best to buy professional sealants and a gun. Construction and installation skills are not required to treat surfaces using polyurethane foam from a tube or a gun.

How to use polyurethane foam (2 videos)

Application of polyurethane foam (21 photos)

In everyday life, the need for special tools does not always arise. If you suddenly need to repair the seal or insulation on small area, but you don’t have a gun for applying foam at hand, you can try to do without it. This will avoid unnecessary expenses. However, you should first find out how polyurethane foam will behave without a gun and how to use it correctly.

There are two classes of polyurethane foam:

• domestic;
• professional.

In terms of technical characteristics, both types of materials are similar, however, differences still exist. First of all, the volume of the cylinders should be noted. Thus, household foam is usually offered in small quantities (up to 800 ml). The kit includes a small piece of tube with a small cross-section. The pressure level in the container is relatively low. This allows you to reduce material consumption in cases where you plan to use a cylinder of polyurethane foam without a gun.

Professional material can be purchased in volumes starting from 1.5 liters; in addition, it is used for large-scale tasks: sealing the seams of window and doorways, sealing large gaps. The foam is contained under high pressure, so it is very difficult to apply it correctly without a gun. There is one more nuance. Thus, the outlet of a professional cylinder is equipped with a fastening element: a threaded cap (bayonet). The gun is installed at this point.

Subtleties of application

First you need to determine what type of material to use: household, professional foam. If you plan to process a large area, you need to take into account the volume of the cylinder. Household-grade products from some manufacturers are sometimes of worse quality than their analogues professional type. For this reason, for more serious problems, it is better to choose the latter option. Possible methods of applying foam without a gun:

• Professional grade material is used, for which a tube is used. You should be prepared for the fact that under high pressure foam will come out in excess.
• Use household material, attaching a tube to the valve, which is equipped with a cylinder.
• Professional foam is used by attaching two tubes of different sections: first a larger one, then a tube of a smaller diameter is inserted into it and fixed well. This will reduce material consumption.

Preparing for work

The site that will be processed must be put in order. Having figured out how to work with polyurethane foam without a gun, perform simple manipulations:

1. Remove any contaminants: dust, dirt. If the gap is quite large, it is pre-filled with foam, which will provide improved thermal insulation qualities for this area and will reduce foam consumption. Using a material such as foam, it is recommended to seal cracks no more than 8 cm in width.
2. The area is moistened with water, for which it is better to use a spray bottle, then the surface will be moistened evenly.
3. Control conditions environment. It is better to carry out work at air temperatures from +5 to +20 degrees. The maximum upper limit is +30 degrees. But in cold conditions, a different type of polyurethane foam is used - frost-resistant.

The procedure must be carried out in protective equipment. Gloves and goggles are usually sufficient.

Tip: If the material contains toluene, you should also wear a respirator.

Instructions for applying foam without a gun

The principle of performing the work is similar to that when using a special tool. If polyurethane foam is used without a gun, how to properly use the tube included in the kit? Step-by-step instruction:

It takes an average of 8 hours for the foam to completely harden. Do not worry if, after this period of time, swelling appears on the treated area. They can be cut with a stationery or regular sharp knife.

Tip: After drying and removing excess foam, be sure to cover it with putty or other material, since otherwise the composition will gradually deteriorate under the influence of sunlight.

Disadvantages of the foam application process without a gun

When deciding which method to choose, you need to take into account both positive and negative aspects in each case. Of course, using a specialized tool greatly simplifies the task. But the process of sealing using a tube without a gun has its drawbacks:

• Large consumption of material. It is necessary to control the intensity and duration of valve pressure. Still, significant pressure contributes to the appearance of excess foam. As a result, the area requires 2-3 times more material, while professional foam is consumed less intensively. This factor determines financial costs – they increase.
• If you plan to use professional foam, you need to remember that it will not always be possible to install a tube. Simply, the balloon will not produce foam.
• Time consumption. To keep it in the correct position flexible tube, and with it the cylinder valve, will take more time. In addition, you need to remember the need to constantly monitor the volume of foam that appears at the outlet. If using a gun makes it possible to complete sealing in 10-15 seconds, independent processing without a specialized tool will take about 15 minutes.

There is one more nuance. Thus, disposable polyurethane foam must be purchased in the required volume, which will avoid unnecessary expenses, otherwise the remainder of the material will simply be thrown away. For this reason, it is sometimes easier to buy a small-volume balloon and fill the gaps with foam using the tube included in the kit.

Almost every person has used polyurethane foam at least once - modern means for sealing, repairing, installing windows and doors, sealing cracks and joints. Using polyurethane foam is quite simple. There is a special gun for this, but sometimes for small repairs in the house you can do without it. But even simple work must be done correctly to achieve high quality.

Peculiarities

A huge assortment of polyurethane foam in specialized retail outlets makes you think when choosing the necessary material. Each of us wants to choose a high-quality and inexpensive composition. Currently, specialized retail outlets offer customers two varieties of this material: household and professional. Let's look at the features of each.

Household

The main distinctive features of household polyurethane foam are the volume of the cylinder. Manufacturers produce this material in small cylinders (about 800 ml). The cylinder comes with a small tube with a small cross-section. The pressure level in household polyurethane foam cylinders is low, this is necessary in order to significantly reduce material consumption when performing repair work. To perform them using household polyurethane foam, you can use a special gun. The cylinder valve is designed to fix the tube and mounting gun.

Professional

To install doors, windows, plumbing fixtures use professional variety polyurethane foam. Manufacturers produce this material in cylinders with a capacity of more than 1.5 liters. The sealant is in a cylinder under high pressure. It is recommended to carry out work using professional sealant using a special gun. To make the use of the material most convenient, the cylinder is additionally equipped with fasteners for strong fixation inside the gun. A large amount of sealant in the cylinder is designed for large-scale work.

Sealants of these varieties have similar technical characteristics. When choosing the required material, you need to consider for what purposes the foam will be needed. In addition, the amount of work is also important.

A distinctive feature of the compositions is the possibility of re-application.

Operating rules

To perform quality repairs or installation work using sealant, you need to know several rules for applying the material.

• The use of a special mounting gun guarantees a better result of the work performed.
• It is necessary to use a professional version of the sealant, which has a useful property: fairly low secondary expansion.
• It is recommended to carry out installation and repair work in the warm season: this will speed up the hardening process of the foam and preserve all its technical qualities.
• When performing work, it is necessary to use personal protective equipment.

• It is recommended to use sealant to seal minor cracks about 8 cm wide. If the width of the cracks exceeds this figure, it is advisable to use other materials (brick, wood, plastic).
• To seal cracks and crevices less than 1 cm wide, it is more economical and practical to use putty.
• During operation, the container with polyurethane foam must be kept upside down.
• Fill the gap with sealant to one third of the depth.
• After the sealant has hardened, you need to remove excess foam using a special knife.

• After completing all the work, it is necessary to cover the frozen layer of foam with special means to protect it from exposure to sunlight.
• To perform work on the ceiling, you need to use a special mounting foam: such a container with sealant can be used in any position.
• To foam deep crevices or cracks, you need to use special extension adapters.
• During operation, the foam container must be shaken and the nozzle of the mounting gun must be cleaned of excess sealant.

How to apply?

Before you start working with this sealant, you need to learn all the intricacies of its use. Otherwise, the quality of work will suffer, the consumption of sealant will increase significantly, which will lead to additional financial costs. First you need to choose the right mounting foam. The choice of material depends on the volume of work.

If you plan large-scale installation of doors, windows or plumbing, or a large volume of repair work, it is better to opt for professional polyurethane foam. The cost of materials of this kind is much higher, but the result of the work performed will pleasantly please you.

Minor indoor repairs (for example, sealing cracks) require the purchase of household sealant.

Applying sealant to the surface without a mounting gun can be done in several ways.

• For minor repairs, you can do without a gun. A special small tube is installed on the cylinder valve. Next, the renovation work begins.
• Professional foam can be applied using a tube, but this method will lead to a large consumption of material and unnecessary financial costs.
• If it is not possible to use a mounting gun when working with professional sealant, you can use two tubes of different diameters. To do this, attach a tube to a cylinder with professional foam. large diameter, then a second (smaller) one is connected to this tube and carefully fixed. This method will significantly reduce material consumption and reduce financial costs.

Once you have decided on the method of applying the foam, you need to prepare the surface. In some cases, the sealant surface can become a false wall. The quality of seam sealing depends on how thoroughly the surface is prepared. The surface is thoroughly cleaned of dust and dirt. Particular attention must be paid to cracks that need to be foamed. Sometimes the surface needs to be degreased.

Large cracks are pre-filled with polystyrene foam. or others suitable material. Only after this can they be filled with foam. This will significantly reduce foam consumption and increase the quality of thermal insulation. Before starting work, the surface must be moistened. A simple spray bottle is perfect for these purposes.

Now you can start sealing. To perform the job correctly, the foam must be at room temperature. Before starting the process, shake the container thoroughly. Only after this a tube or gun is attached to the cylinder. Now you can apply the composition.

If you decide to use foam without a special gun, you need to consider the disadvantages of this process.

• Due to the high pressure in the cylinder, foam consumption increases significantly (sometimes two or three times).
• The valve design of some cylinders does not provide for the use of a tube.

Carrying out sealing work with a gun saves a lot of time. Foaming the surface with polyurethane foam using a gun is not at all difficult.

It is enough to learn how to dose the foam output. In this way you can glue any objects, not forgetting about preparing the surface. Then we begin to apply the sealant. It is important to remember that you need to fill the vertical gap with sealant from the bottom, smoothly moving upward.

After finishing work, you must thoroughly clean the gun from foam using a special washing liquid. It needs to be poured into the tool. If during work a small amount of sealant gets on your hands, it must be removed with a solvent. Excess foam from contaminated areas must be removed during operation with a sponge soaked in solvent. If the sealant has hardened, you will have to remove it mechanically.

You cannot work with expired foam. The spray can must be handled carefully. You can't bring it near the fire. If the expiration date of the polyurethane foam has expired, the material loses its properties.

When choosing polyurethane foam, you need to remember that the container can only be used once. Therefore, before purchasing, you must carefully calculate the required volume. If you have any doubts about this, it is better to consult a specialist.

Take note of some useful tips.

• Before starting work, you should prepare a spray bottle to spray water on the surface before applying foam; you will need a knife to cut off excess material.
• While doing the work, you will need a sponge or soft cloth soaked in acetone or solvent.
• The correct dosage of sealant will significantly reduce material consumption.

• It is more convenient to remove excess sealant from the surface after four hours after application; after complete hardening, this process will become much more difficult.
• Be sure to use personal protective equipment (respirator, goggles, gloves).
• It is necessary to ventilate the room during work.
• After completing all work, it is necessary to process the frozen foam special means for protection from sun rays. This must be done before the foam darkens.
• It is strictly forbidden to use the cylinder near an open fire.

Mechanism of action

Scheme foam fire extinguishing:

1. The appearance of a fire, a maximum increase in temperature, and smoke are detected by a special sensor.
2. The signal from the sensor is automatically transmitted to the control panel.
3. The control panel turns on the fire suppression system
4. The compression mixture is transferred under pressure through a pressure foam pipeline to the distribution network.

There are two ways to form a fire extinguishing mixture in a stationary system:

1. The metering pump releases a certain amount of foaming agent into the water stream. The resulting mass appears during the elimination of the source of fire. It shows itself most effectively when used in large areas of premises.
2. Neutralization of fire with ready-made compression solution. This increases the effectiveness of fire suppression by reducing system response time. The fire extinguishing mass is supplied to the source of fire faster. It is recommended to use for small spaces, observing a number of conditions:

• monitor the shelf life of the finished fire extinguishing solution (in this case, its shelf life is shorter than that of the foam concentrate itself);
• the tank where the fire extinguishing mass is stored must be covered with special substances (for example, epoxy mastic) to prevent contact of the stored substance with concrete.

Conditions of use

Basic external factors The factors that have a great influence on the so-called foaming are the quality of the product, humidity, temperature and the tool used.

For example, when there is little moisture in the air, polymerization will take quite a long time.

The result of this will be the appearance of too large pores. To avoid this, it is recommended to artificially add moisture to the installation seam. The lowest humidity usually occurs in hot or cold weather.

With the temperature factor, everything is more complicated, but solvable. There are materials of summer and winter types, they are classified as one-component and two-component.

One-component polyurethane foam is a polyurethane sealant.

Two-component polyurethane foam for professional-level builders is packaged in large containers, and it must be mixed in precisely measured parts before use using a mixing gun.

A nozzle is put on it, the result is a fine-mesh material of high quality.

Two-component foam is distinguished by its ability to harden quickly and have very high-quality polymerization. Excess from the outside is removed with a knife just ten minutes after it is sprayed.

The main advantage of two-component foam is its increased output volume. But if we take into account the complexity of its preparation and application, as well as the high cost, we can conclude that it is advisable to use this foam only for professional work.

For the most part, the polymerization reaction occurs when it interacts with air, and as a result we obtain polyurethane.

Foaming agent - liquefied butane, isobutane or propane mixed in certain proportions (this substance is called propellant). The resulting prepolymer creates foam; it increases in volume twenty times.

Polyurethane foam can expand and fill places that have very difficult access. The material hardens quite quickly due to the moisture contained in the atmosphere. Within a day, everything freezes, turning into a stable composition.

The great advantage of this material is its strength and stability, as well as the absence of harmful components. The porous structure makes foam one of the best insulators.

Polyurethane foam is used to work with any material. This includes stone, concrete, iron, wood, and plastic.

Let's summarize: which polyurethane foam is best to choose - household or, better yet, professional.

Household and professional foam have almost the same components, and both the first and the second are perfect for most jobs. Remember: never use simple foam to install windows and doors. Don’t forget to look at GOST density, tension and its linear deformation (ask experts for answers and explanations).

You can learn how to use polyurethane foam correctly from the video.

Why is it necessary to install door panels?

When installing interior doors, quite often the depth of the doorway is slightly wider than the thickness of the door frame, which is why the frame is placed flush with one of the wall planes. Whereas back side the opening remains open and requires aesthetic transformation.

And in order to solve a similar problem today, several options can be used, be it the construction of slopes (from plastic, MDF or mortar), or hiding unflattering areas using special door panels decorative panels, that are integral part boxes.

So, if we talk about the advantages of design door slopes with help plastic panels or plaster mixtures, then we can highlight the relatively low cost of these materials. But at the same time, the doorway is an object of increased level of exploitation, which is why the use of materials that are not resistant to mechanical stress (plastic, MDF) for the design of the doorway is not always acceptable.

If we talk about the advantages of door extensions, then it is necessary to highlight the following:

• Ease of installation due to the fact that the extensions are a specialized product for hiding the ends of the doorway.
• A wide range of door extensions, both in color and in the material from which they are made, allows you to select these products for almost any task. By the way, it is very convenient to purchase accessories as a set: door leaf + door frame+ extensions + platbands (all products will be made in the same style).
• A doorway decorated with extensions looks stylish and elegant and is the logical conclusion of the entire structure.

Automatic foam fire extinguishing installations. Kinds

Based on the method of influencing the source of ignition, automatic devices are distinguished:

• General surface devices. Provide fire protection to the entire existing surface. Such installations are effectively used, for example, to protect storage facilities with flammable liquids.
• Local-surface installations. Designed to extinguish fires in certain areas of controlled areas, objects, apparatus, etc.
• General volumetric structures. The principle of operation is based on filling fire-neutralizing objects with a fire-neutralizing mixture.
• Local-volumetric devices. Fill a certain part of the volume technological designs, premises.
• Combined installations. The impact scheme consists in combining the principles of local-volumetric and local-surface fire extinguishing. In this case, a double effect occurs: the fire extinguishing compression mixture is simultaneously supplied into the volume of the object, as well as onto its surface.

Automatic foam fire extinguishing installations, based on the multiplicity of the compression mixture used, are:

• Low expansion fire-fighting installations (generators, foams, foam sprinklers, trunks). Heavy foam with low expansion ratio from 4 to 20 is generated;
• Medium fire extinguishing installations (stationary systems). Produces medium-heavy foam with expansion ratio from 20 to 200;
• Installations for neutralizing high-expansion fires (light foam generators). Lighter high-expansion foam from 200 to 1500 is used.

Fire-fighting foam fire extinguishing devices based on the type of dispenser are divided into:

• Devices using Venturi tubes;
• Dosing tanks;
• Systems with a dosing hydraulic motor.

The main criteria for choosing polyurethane foam

Ordinary household foam is available in a disposable version; a tube is attached to the container. Typically, such a product is not very dense and exhibits noticeable secondary expansion. Most often, this composition is purchased to fill cracks and voids, where special care and precision in work is not required.
For professionals, polyurethane foam is intended in cylinders for a special gun. The material has a high density; after drying, it retains its original volume, and the foam yield is much higher. Thanks to the gun, you can regulate the flow of insulator, which allows you to use the product economically

One can can be used several times, washing the gun after each use.
Important characteristic polyurethane foam becomes the temperature range of application. Having purchased a summer compound, you can work at positive temperatures from +5 to +40°C

The all-season product has a wider operating range of -10. +30°С. And to seal seams and fill voids in cold weather, it is better to use a winter option that can withstand temperatures down to -20°C.
You can also find fire safety markings on the can of polyurethane foam. If the product is marked B1, then the composition is fire-resistant. The designation B3 indicates the flammability of the material. This factor is important to consider when sealing chimneys or heating boilers.

Experts selected 7 of the best polyurethane foams for our review. When compiling the rating, the following criteria were taken into account:

1. safety of use and operation;
2. technical specifications;
3. price;
4. opinion of professionals;
5. reviews from domestic users.

Manufacturers

Choose among manufacturers who have been in this market segment for quite some time and are reliable.

The all-season mounting foam "Imperial", produced by the TechnoNIKOL corporation, or the professional mounting foam "TechnoNIKOL" 65 Constant have good reviews. The Bostik PRO Standart 65 foam has also shown itself to be good (for many years now). And the mounting foam “Moment Montazh PRO 65 All-season” 850 ml.

The production of polyurethane foam is a very multi-tasking process based on high technology. This process is constantly evolving, because manufacturers need to adapt to market changes, to changing production materials, and to the organization of rather dangerous production (flammable materials are used). Let us note that the production result is largely influenced by the production culture at any individual factory. After all, using the same recipes, it is impossible to obtain absolutely similar foam at different factories.

Each manufacturer, of course, has its own advantages, and possibly disadvantages.

It should be noted that big companies At the same time, along with their advantages, they also have disadvantages: they react very slowly to the demands of a constantly changing market, they have very poor control over the goods produced, and constant competition and conflicts within firms are expressed in a constant increase in prices, therefore, there is constant savings costs.

There is an undeniable rule (as with most products, materials or services) - high quality impossible when the price of a product or service is low.

Quality can be 100 percent guaranteed only by the use of expensive components in production that are used in preparation and additional expenses for stable, well-established control of the entire production process and quality control.

Very often, consumers in our country put up with the very low quality of foams for installation, because since Soviet times, the feeling of saving money due to the low cost of products has been common.

Cheap materials have many negative characteristics, and together they will increase the price of the result. The main rule: if you get more material at the exit from the cylinder, then the more less money you will pay for the entire volume.

The second basis for understanding the quality of truly good polyurethane foam is that inexpensive components in production will never produce high-quality foam.

The most “popular” method used by manufacturers to reduce costs is to increase the number of ballast components (usually chlorinated paraffins).

Most chlorinated paraffins make the foam much heavier, as a result: the volume of the foam mass at the outlet decreases, its hardening time increases, and expansion increases.

Rating of the best polyurethane foams

Penosil GoldGun 65

Penosil GoldGun 65 polyurethane foam is chosen mainly by professional builders. They note the ideal combination of price and quality of the Estonian product. Experts also note that there is no shrinkage and little re-expansion, which makes the composition predictable. The foam earned special praise from experts for its highest yield. The material has a wide range of applications, from installing window and door frames to filling all kinds of voids.

According to experts, Penosil GoldGun 65 polyurethane foam deserves the highest rating for high quality, reasonable price, invariably White color and record output in volume. One can only criticize the foam for its fear of low temperatures.

Scope of application of stationary automatic foam extinguishing devices

• Cargo loading devices for transporting petroleum products, fuels and lubricants, and flammable liquids.
• Premises with installed oil pumping and oil refining equipment.
• Warehouses for storing flammable materials ( paint coatings, solvents, alcohol, primer, etc.).
• Engine rooms with installed technological equipment(generators, compressors, engines internal combustion etc.).
• Premises with installed main/emergency energy sources, fire pumps, auxiliary equipment.
• Places where equipment equipped with a fuel tank accumulates (vehicles, equipment for moving dry cargo, auxiliary equipment).
• Oil tankers, river and sea vessels of various classes, purposes.

Automatic foam extinguishing systems are not used with substances/equipment:

• Liquefied gases with low boiling points (propane, butadiene, etc.).
• Gases in their natural state.
• Substances that release oxygen, oxidizing agents.
• Substances that react with water.
• High voltage electrical equipment.

6 Moment Installation

By itself favorable price can be purchased at different regions countries polyurethane foam Moment Installation. You can buy a can of this insulating substance at any provincial store. It is available for use with or without a pistol. The most commonly available foam is all-season foam, which is suitable for jobs such as installing windows and doors, filling voids, and sealing seams. A distinctive feature of the material is its density and uniformity. The foam has good adhesion to various building materials. After complete drying, an insulation is formed that is not toxic or harmful to the human body.

The advantages of domestic foam Moment Installation include an affordable price, good quality. Sometimes there are fakes that have an unpleasant odor and yellow color. Such foam can squeeze out door frames or window sills when hardened.

Disadvantages of using professional materials without a gun

If you use polyurethane foam without a gun, the container of which is designed specifically for this type of application, you should be aware of the disadvantages of such work. The gun, of course, significantly simplifies the sealing work performed, but this is not the only reason why experts recommend buying everything necessary tools for repair.

Sealing through a tube has the following disadvantages:

1. 1.
   Big expense. When repairing, you have to very carefully control the intensity of the material output when the valve is pressed. Too much pressure inside the package causes excess material to escape. Most often, the overspending is 200%, and sometimes 300%.
2. 2.
   Not all professional cylinder valves can be equipped with a tube. If the product is intended exclusively for use with a gun, the sealant simply cannot be removed from the packaging.
3. 3.
   Time costs. Working with professional products without special tools can take a lot of time. Using a gun, even a large seam can be sealed within 20-30 seconds, whereas manual sealing will take 15-20 minutes.

In order to carry out repairs quickly, efficiently and without unnecessary financial costs, it is recommended to first calculate the required volume of sealant. In most cases, for simple household work, a household cylinder is sufficient, which is designed for use with a tube, which will speed up and reduce the cost of repairs. If the sealing involves large-scale sealing, it is better to purchase a professional sealant with a special gun.

It often happens that you need to fill a small hole or gap during cosmetic repairs apartments or houses
. The best option is to pour polyurethane foam into the cavity, which, expanding, will tightly plug any hole. Ease of use is the main advantage that determines the popularity of this sealant based on polyurethane foam.

Differences between professional and amateur cylinders

Polyurethane foam is available in two packaging options: for domestic use and professional. Amateur foam is equipped with an adapter tube, which is screwed onto the valve and activated by pressing your fingers on the special stops of the tube. To work with professional foam, you need a special tool - a gun.

Obviously, buying a gun, the cheapest model of which costs the same as a can of foam, for a one-time procedure is wasteful. The advantage of using the professional version is that the opened cylinder can be stored for several months if you do not remove it from the gun adapter.

Builders call amateur bottles “disposable,” meaning that the opened container must be used immediately. But you can use a simple method to ensure that reuse a container of household polyurethane foam many times
. Professionals don’t do this, because they save time and don’t get involved with such trifles, but for home handyman this advice
will useful
.

How to preserve a container of household foam

So, you have foamed the holes and used no more than a third of the polyurethane sealant. What's next? Throw away the remaining foam? Don’t rush to throw away your money, there is a way to preserve the cylinder. More precisely, even two ways.

If it is expected reuse a started container of amateur polyurethane foam
within a month, it is enough to bend the plastic tube through which the sealant is supplied and secure the bend with tape. Now we press on the valve so that pressure is created in the tube. The container can remain in this form for up to two months. Just remove the tape, bend the tube, and the bottle is ready for use.

If foam is needed only after four to five months, another method is used. In this case, acetone should be used. Carefully remove the tube and rinse with acetone. We also drip acetone into the hole in the exhaust valve of the cylinder. To be sure, repeat flushing the valve two or three times. Now the cylinder can last up to six months.

Sometimes the sealant still dries out in the cylinder outlet valve. How to solve this problem, see the article “How to open a cylinder with foam frozen in the outlet valve.”

4 Makroflex Standard

The most popular polyurethane foam among homeowners and professional builders is Makroflex Standart. This brand is so popular in our country that you can find the products in the most remote parts of Russia. Foam is intended for sealing cracks and voids, although it is often used as a thermal insulation material. Spray cans often flash when installing windows and doors, filling cracks in old houses, garages, barns, etc. K strengths foam should be attributed to good adhesion to a wide variety of building materials. Moreover, it has a homogeneous structure and does not suffer from secondary expansion.

Thanks to the popularity of the brand, Makroflex Standart polyurethane foam is in demand in our country. Affordable price goes well with technical properties. But the downside of popularity was big number fakes In addition, reviews note shrinkage of the material after drying.

Foam fire extinguishing station

As an addition to stationary fire extinguishing systems, and also completely independently, a foam fire extinguishing station can be used. It is an autonomous block-box with all the necessary fire-fighting equipment and equipment, capable of functioning for a certain time without connecting additional communications, without reducing its effectiveness.

Distinctive features of the fire station:

• quick, effective elimination of the source of fire;
• autonomous operation without additional communication connections (predetermined time);
• constant readiness for operational fire fighting;
• storage of all components of the fire extinguishing mass;
• storage of a pre-agreed set of fire-fighting equipment.

The station block box consists of a foam generator, water storage tanks, a foam concentrate, compressed air/nitrogen cylinders, a compressor, an electronics unit, pumping station, accompanying communications and pipeline systems.

The autonomous station can be turned on (inertia - about 3 s) automatically, using the remote control remote control or manually.

Compressive fire extinguishing agent is supplied to the fire site by installed pipeline, or along those laid in expeditiously hoses of fire-fighting equipment. In this case, the source of water can be its own container inside the block box, as well as the local fire-fighting water supply.

An autonomous fire extinguishing station is characterized by low capital costs (compared to equipping a room with a stationary system), simplified operation (does not require special technical personnel for maintenance and intended use), and no preliminary design is required.

Autonomous stations and stationary automatic foam extinguishing installations have become widespread due to good characteristics, high efficiency, wide range of applications. The ability to eliminate the source of fire within short term, relatively inexpensive price, big choice types and models of fire extinguishing installations contribute to their popularity as quality method extinguishing fires of varying complexity.

How to install a door leaf

Door manufacturers offer a wide range of products. The door is immediately equipped with a door frame. All you need to do is take measurements of the doorway and go to the store. Remember that there must be a gap between the wall and the frame for the foam, which guarantees the reliability and strength of the structure being installed.

Interior doors

Install interior door It's not difficult if you follow the instructions. Working with a door leaf requires preparation, so the first thing you need to do is purchase a set of tools, which includes:

Door fittings:

to install interior fabric follow several steps:

• dismantle old door. To do this, remove the door leaf and disassemble the door frame;
• assemble a new door frame. To assemble it, remove the racks from the packaging and fasten them together with self-tapping screws. The box is assembled with rectangular or beveled corners of the posts;

Box installation

install door hinges on the box. To secure the hinges, you will need tools such as a cutter, a screwdriver, an awl, a thin drill and a drill. Sometimes used to secure loops circular saw and a pencil;

Foaming gaps

Foam with a tube - threat of expansion

The main disadvantage of household foam with a straw is significant secondary expansion

When hardening, it can increase several times, so it is extremely important to comply with all conditions of use.

Instructions for using household foam can be seen on the back of the cylinder, but let’s look at it in more detail and step by step:

Surface cleaning and preparation. Before applying the foam, you must carefully check all cracks and holes for the presence of small debris and, if necessary, degrease the surface with acetone.
Surface moistening. Polyurethane foam requires contact with moist air, therefore, before using the can, the surfaces need to be moistened - a regular spray bottle is quite suitable for this purpose.
Preparing a foam bottle. A little trick - before using the foam, you need to hold it for several hours in water with a temperature of about 20 ° C - after this procedure it will lie down better. Before starting work, shake the container for a minute so that all components are evenly mixed - this will ensure maximum foam yield.
Attaching a tube or gun to a cylinder. The tube is simply screwed onto the valve, but with a pistol the situation is somewhat more complicated - we will consider the issue of its selection and use below.
Working with foam. By the right technology The polyurethane foam is applied in small sections (about 10 cm) from bottom to top - this helps to avoid unnecessary spreading of the material. It is necessary to ensure that the gap is not filled by more than 50% - during hardening the volume will increase greatly, which can lead to damage to the structure being treated

It is extremely important not to touch uncured foam - any physical impact and disruption of the structure worsens hardening and negatively affects volume and density.
It is necessary to ensure that the cylinder is always in the “upside down” position - this will ensure the most complete consumption of foam.

Difficult moments:

Problem when using	How to solve
Foaming hole wider than 3cm	Polyurethane foam must be applied in several stages, waiting for each layer to harden. Before reapplying the foam, be sure to moisten the hardened base.
Through slots	Under no circumstances should such holes be filled with foam on both sides - this can lead to severe deformation of the structure. Foam is used on one side only, the other side is usually filled with silicone sealant.
Installation of door and window frames	To reduce the pressure on the structure, it is recommended to use dowels and additional spacers (they are removed after hardening). Otherwise, the foam, expanding, can seriously distort the frames of doors and windows.

The container of household foam must be used completely, otherwise the composition will harden during storage and will be unsuitable for use. With professional foam such problems do not arise, but there are some nuances.

Working with selected polyurethane foam without a gun instructions

The principle of sealing openings without a gun is exactly the same as when using special tools. When the surface to be treated is ready, shake the can thoroughly. Manufacturers recommend shaking it vigorously for 30-40 seconds, which will ensure uniform release of the sealant from the package.

Now you should remove the protective cap from the sealant and attach the PVC pipe that came with the valve to the valve. household product. For professional products, tubes will have to be purchased separately. The free end of the tube is brought to the opening to be sealed. The gap needs to be filled with foam by 30-40% (sometimes 50%) of its size, this is due to the fact that the sealant significantly increases in volume when hardening. Partial filling makes it possible to reduce consumption and overall size repair costs. If, after the sealant has dried, its obvious shortcoming is revealed, you can always add another layer, although most often this is not required.

Foam begins to come out of the container under pressure when the valve is pressed. The triggered valve causes the sealant to flow into the tube and then onto the surface being treated. Complete drying of the sealant is almost always completed within 8 hours after work. If, after drying, the foam swells and some of its parts protrude too much from the sealed seam, it is very easy to cut off the excess with a stationery knife.

Mounting gun price or quality

A professional gun ensures accurate and dosed application of polyurethane foam, reusable use of the container and accuracy when working. There are many modifications of such a tool, but the design of the device and the principle of operation are approximately the same:

1. The tip of the gun - as a rule, its diameter is several times smaller than the diameter of the tube itself. This feature allows you to repeatedly increase the pressure when foam comes out, which, in turn, guarantees a good volume.
2. The barrel (tube) is the channel through which the foam comes out. It can be one-piece or collapsible (in two parts), which simplifies the maintenance of the instrument.
3. Adapter - an adapter for connecting to the neck of a foam bottle. In high-quality models it is coated with Teflon.
4. Adjustment unit - allows you to dose the foam output and its pressure.
5. Fastening nut - with its help the barrel is attached to the handle. This design allows the tube to be removed for cleaning or replacement.
6. Trigger - used to adjust the supply of polyurethane foam.
7. Handle - made from various types plastic and metals. Aluminum handles are considered the most reliable and comfortable.

The operating principle of the mounting gun is based on simple mechanics: after attaching to the cylinder, the foam passes through the supply valve into the barrel, where it remains until the trigger is pressed. Pulling the trigger opens the valve on the tip, releasing the foam. The regulating mechanism allows you to control the volume of foam supplied.

Since there is nothing superfluous in the design of the pistol, choosing such a tool is quite simple. There are just a few factors to consider:

1. The quality of the materials from which the gun is made. It is better if it is made entirely of hard metals. Meet quality models made of plastic, but this is very rare.
2. Collapsible design: monolithic guns are cheaper, but the price of a collapsible tool will pay for itself many times over when cleaning and replacing parts.
3. Working pressure in the gun. This characteristic cannot be checked in a store, but there is a little trick. When buying a gun, immediately purchase a can of cleaner (it contains acetone). At home, you need to screw the gun onto a bottle of cleaning liquid, press the trigger to release it inside, then remove it and leave it for a couple of days. If after this time the acetone fires when the trigger is pressed, the pressure is normal. If not, you can return the low-quality product to the store; acetone does not leave any traces on the surface of the barrel.

Tools and materials

1. Polyurethane foam

The foam can be either well-known construction brands or noname, in principle it does not matter, the main thing is that it is polyurethane foam. I have been using foams for many years various brands and the only difference I found was the price. If you do not have a professional gun (and when installing 3-5 doors there is no need for such a gun), then you need to buy foam with disposable nozzles inserted into the lid. The required amount of foam depends on the gap between the door frame and the wall or partition and on the width of the door frame. As a rule, one 750 ml cylinder is sufficient to install one door.

3. Wedges

Usually wedges are made from available material: scraps wooden beam, old door frames, baseboards, platbands, etc. But in some cases, if the doorway is quite vertical and the gaps between the door frame (door frame, jamb) do not exceed 1.5-2 cm, then ready-made wedges can be used:

Such wedges are sold in sets of 20-100 pieces. in departments of shops and supermarkets dedicated to laminate flooring. To install 1 door you need to have (or make) from 8 to 32 wedges.

4. Spacers

Typically, spacers are made from old baseboards or trim. For this purpose, you can also buy a beam with a cross-section of 2.5-3x4-5 cm. I have never seen ready-made spacers for installing doors on sale, but I do not rule out this possibility. The number of spacers depends on the design and thickness of the door frame, as well as the thickness of the foam layer. If the door frame has a threshold and the thickness of the frame is 3 cm or more, then 1 spacer in the middle is enough. For boxes about 2 cm thick, it is advisable to install 3 spacers. For boxes with a thickness of 1.5 cm or less (and there are such), it is better to use wall or partition mounts.

Construction of a foam fire extinguishing system

Stationary fire protection installation foam extinguishing includes:

• Generator of air-mechanical fire extinguishing agent
• Compression foam mixer
• Foam dispenser
• Water supply barrel
• Water supply pipeline
• Tank for placing fire extinguishing mixture
• Sprinklers:

1. deluge (the air-mechanical mixture comes out of the hole without a thermal lock)
2. sprinkler (equipped with a thermal lock that melts when the temperature rises):
3. water-filled (used in rooms with air temperature not lower than 5⁰ C);
4. air (installed in rooms without heating).

After receiving a signal from the automatic control panel, the mixing container is filled with water. In this case, the compressor adds a strictly dosed amount of foaming agent to the water. The air-compression mixture passes under pressure through the mesh cassettes. It leaves the foam generator body in an increased volume and is then supplied to the sprinklers. The metering pump pumps the compression mass into the peon pipe.

conclusions

To ensure that the installation and operation of door panels does not cause any difficulties, it is advisable to follow the following recommendations when carrying out work.

Firstly, it is necessary to use polyurethane foam with a low linear expansion coefficient (for example, TITANIUM, MACROFLEX, etc.) as an adhesive, and only under the gun.

Secondly, when cutting extensions, always take into account the size of the gap formed during the cutting of the material (1 - 2mm).

Third, never allow sealants to be used to hide unsightly cracks. With proper measurement and cutting of the material, the extensions should clearly adjoin each other (without gaps).

Fourthly, when setting up the extensions (even before foaming), it is imperative to provide for options for spreading the extensions in advance, so that this operation can be carried out as quickly as possible. Also, for the convenience of installing the extensions, it is advisable to install spacer wedges in the cavity between the underside of the extension and the wall opening, which are subsequently dismantled (after the foam has hardened).

Introductory video on how to install door panels with your own hands

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