Multilayer chipboards GOST. Chipboard: production, GOST, characteristics, dimensions

INTERSTATE STANDARD

WOOD-BOARD BOARDS

MKS 79.060.20

OKP 55 3400

date introduction — 2009—01—01

Preface

The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 “Interstate standardization system. Basic provisions" and GOST 1.2-97 "Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Procedure for development, adoption, application, updating and cancellation"

Standard information

1 DEVELOPED by the Technical Committee for Standardization TK 121 “Woodboards”

2 INTRODUCED by the Federal Agency for Technical Regulation and Metrology

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Protocol No. 31 of June 8, 2007)

Short name of the country according to MK (ISO 3166) 004—97	Country code according to MK (ISO 3166) 004—97	Abbreviated name of the national standardization body
Armenia		Ministry of Trade and Economic Development
Belarus		State Standard of the Republic of Belarus
Kazakhstan		Gosstandart of the Republic of Kazakhstan
Moldova		Moldova-Standard
Russian Federation		Federal Agency for Technical Regulation and Metrology
Tajikistan		Tajikstandard
Uzbekistan		Uzstandard
Ukraine		Gospotrebstandart of Ukraine

(Changed edition, Amendment 2008)

4 This standard takes into account the main regulations of the following international and European standards:

ISO 820:1975 “Wood-based particle boards. Definition and classification" (ISO 820:1975 "Particle boards - Definition and classification", NEQ);

EH 312:2003 “Particle boards. Technical specifications" (EN 312:2003 "Particle boards - Specifications", NEQ)

5 By order Federal agency on technical regulation and metrology dated August 29, 2007 No. 219-st interstate standard GOST 10632-2007 put into effect as a national standard Russian Federation from January 1, 2009

6 INSTEAD GOST 10632-89

AMENDED (IUS No. 2 2008)

Information on the entry into force (termination) of this standard is published in the “National Standards” index.

Information about changes to this standard is published in the “National Standards” index, and the text of the changes is published in the “National Standards” information indexes. In case of revision or cancellation of this standard, the relevant information will be published in the information index “National Standards”

1 Application area

This standard applies to particle boards general purpose, made by hot flat pressing of wood particles mixed with a binder (hereinafter referred to as boards), used in industry and construction.

Application of slabs for specific types products are established in agreement with national sanitary and epidemiological surveillance authorities.

The standard does not apply to slabs special purpose, as well as on slabs with a lined or painted surface.

This standard uses normative references to the following interstate standards:

GOST 12.1.004—91 System of occupational safety standards. Fire safety. General requirements

GOST 12.1.014—84 System of occupational safety standards. Air working area. Method for measuring concentrations harmful substances indicator tubes

GOST 12.3.042—88 System of occupational safety standards. Woodworking production. General safety requirements

GOST 12.4.009—83 System of occupational safety standards. Fire fighting equipment for the protection of objects. Main types. Accommodation and service

GOST 12.4.011-89 System of occupational safety standards. Protective equipment for workers. General requirements and classification

GOST 427-75 Metal measuring rulers. Specifications

GOST 577-68 Dial indicators with a division value of 0.01 mm. Specifications

GOST 3560—73 Steel packaging tape. Specifications

GOST 7502-98 Metal measuring tapes. Specifications

GOST 8026-92 Calibration rulers. Specifications

GOST 10633-78 Particle boards. General rules preparation and conduct of physical and mechanical tests

GOST 10634-88 Particle boards. Methods for determining physical properties

GOST 10635-88 Particle boards. Methods for determining the tensile strength and elastic modulus in bending

GOST 10636-90 Particle boards. Method for determining the tensile strength perpendicular to the plate face

GOST 10637-78 Particle boards. Method for determining the resistivity of pulling out nails and screws

GOST 10905-86 Testing and marking plates. Specifications

GOST 11842—76 Particle boards. Method for determining impact strength

GOST 11843—76 Particle boards. Hardness determination method

GOST 14192—96 Marking of cargo

GOST 15612—85 Wood products and wood materials. Methods for determining surface roughness parameters

GOST 15846—2002 Products sent to the Far North and similar areas. Packaging, labeling, transportation and storage

GOST 18321-73 Statistical quality control. Methods for random selection of samples of piece goods

GOST 21650-76 Means for fastening packaged cargo in transport packages. General requirements

GOST 23234-78 Particle boards. Method for determining the specific resistance to normal tearing of the outer layer

GOST 24053—80 Particle boards. Furniture parts. Method for determining warp

GOST 24597-81 Packages of packaged piece goods. Main parameters and dimensions

GOST 26663—85 Transport packages. Formation using packaging tools. Are common technical requirements

GOST 27678—88 Chipboards and plywood. Perforator method for determining formaldehyde content

GOST 27680—88 Chipboards and wood-fiber boards. Size and shape control methods

GOST 27935-88 Wood-fiber and particle boards. Terms and Definitions

NOTE When using this standard, it is advisable to check the validity of the referenced standards in information system common use- on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or according to the annually published information index “National Standards”, which was published as of January 1 of the current year, and according to the corresponding monthly information index published this year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Dimensions and classification

3.1 The nominal dimensions of the slabs and their deviations must correspond to those indicated in Table 1.

Table 1

Parameter	Value, mm	Maximum deviation, mm
Thickness	From 3 or more with gradation 1	±0.3* (for polished slabs)
		0,3/ +1,7 (for unsanded slabs)
Length	1830, 2040, 2440, 2500, 2600, 2700, 2750, 2840, 3220, 3500, 3600, 3660, 3690, 3750, 4100, 5200, 5500, 5680	±5.0
Width	1220, 1250, 1500, 1750, 1800, 1830, 2135, 2440, 2500	±5.0
* Both within one slab and within a batch of slabs. Notes 1 It is allowed to produce slabs with dimensions smaller than the nominal ones by 200 mm with a gradation of 25 mm, in an amount of no more than 5% of the batch. 2 By agreement between the manufacturer and the consumer, it is allowed to produce slabs in formats not specified in this table.

3.2 Classification

3.2.1 Plates are divided into:

according to physical and mechanical indicators - by grades P-A and P-B;
in terms of surface quality - grades I and II;
by type of surface - with a regular and fine-textured (M) surface;
according to the degree of surface treatment - polished (Ш) and unpolished;
in terms of hydrophobic properties - with normal and increased (B) water resistance;
according to formaldehyde content - into emission classes E1, E2.

3.2.2 Symbol slabs should include: brand designation, grade, type of surface (for slabs with a fine-textured surface), degree of surface treatment (for polished slabs), hydrophobic properties (for slabs with increased water resistance), formaldehyde emission class, nominal length, width and thickness in millimeters, designation of this standard.

Examples of symbols:

Plate grade P-A, grade I, with a fine-textured surface, polished, emission class E1, size 3500´1750´15 mm:

P-A,I, M, W, E1, 3500´ 1750 ´ 15, GOST 10632—2007

Plate grades P-B, II grade, with normal surface, unpolished, emission class E2, size 3500´1750´16 mm:

P-B,II, E2, 3500´ 1750 ´ 16, GOST 10632—2007

4 Technical requirements

4.1 Deviation from edge straightness should not be more than 1.5 mm per 1 m of edge length.

4.2 Deviation from perpendicularity of the edges of the slabs should not be more than 2 mm per 1 m of edge length.

The perpendicularity of the edges can be determined by the difference in the lengths of the diagonals of the face, which should not be more than 0.2% of the length of the slab.

4.3 The physical and mechanical properties of the slabs must comply with the standards specified in Table 2.

table 2

Indicator name	Standard for slab grades
Indicator name	P-A	P-B
1 Humidity, %:
Tn*
T in
2 Maximum density deviation within the slab, no more**	±10%
3 Swelling in thickness over 2 hours (sample size 25´25 mm), %, ( T in)***
4 Ultimate bending strength, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.	13,0	14,0
» 5 » 6 »	15,0	14,0
» 7 » 13 »	14,0	12,5
"14" 20"	13,0	11,5
» 21 » 25 »	11,5	10,0
» 26 » 32 »	10,0
» 33 » 40 »
St. 40
5 Modulus of elasticity in bending, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.	1800
» 5 » 6 »	1950
» 7 » 13 »	1800
» 14 » 20 »	1600
» 21 » 25 »	1500
» 26 » 32 »	1350
» 33 » 40 »	1200
St. 40	1050
6 Tensile strength perpendicular to the slab face, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.	0,45	0,31
» 5 » 6 »	0,45	0,31
» 7 » 13 »	0,40	0,28
» 14 » 20 »	0,35	0,24
"21" 25"	0,30	0,20
» 26 » 32 »	0,25	0,17
» 33 » 40 »	0,20	0,14
St. 40	0,20	0,14
7 Resistivity normal separation of the outer layer, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.
» 5 » 6 »
» 7 » 13 »
» 14 » 20 »
» 21 » 25 »
» 26 » 32 »
» 33 » 40 »
St. 40
8 Warp, mm ( T in)
9 Surface roughness Rm, µm, no more:
for sanded boards with normal surface
for sanded boards with fine-textured surface
for unsanded slabs**
* Tn And T in— lower and upper limits of indicators, respectively. Determined by agreement between the manufacturer and the consumer. * For slabs with increased water resistance.

Reference values of physical and mechanical parameters of particle boards are given in Appendix A.

4.4 The surface quality of the slabs must comply with the standards specified in Table 3.

Table 3

Defect according to GOST 27935	Standard for slabs
	polished, varieties		unpolished, grades

Depressions (protrusions), scratches on the surface	Not allowed	No more than 2 pieces are allowed per 1 m2 of slab surface. with a diameter of up to 20 mm and a depth (height) of up to 0.3 mm or two scratches up to 200 mm long	Allowed on an area of no more than 5% of the surface of the slab, with depth (height), mm no more than:

Paraffin, oil and binder stains	Not allowed	Spots with an area of no more than 2 cm2 are allowed on 1 m2 of the slab surface in the amount of 1 piece.
Dust and resin stains	Not allowed	Allowed on an area of no more than 2% of the slab surface	Allowed
Chipped edges	Not allowed (single units with a face depth of 3 mm or less and an edge length of 15 mm or less are not taken into account)	Allowed within deviations along the length (width) of the slab
Corner chipping	Not allowed (edge length 3 mm or less is not taken into account)	Allowed within deviations along the length (width) of the slab
Grinding defects (under-grinding, over-grinding, linear grinding marks, surface waviness)	Not allowed	Allowed area is no more than 10% of the area of each side of the slab	Not defined
Individual inclusions of bark particles on the surface of the slab size, mm, no more
Individual inclusions of large chips on the plate face size, mm:	Allowed in quantities of 5 pieces. per 1 m 2 plate size, mm:
for slabs with fine-textured surface	10—15	16—35	10—15	16—35
for slabs with normal surface	Not defined
Foreign inclusions	Not allowed
Note - Allowed for slabs with a regular surface is no more than 5 pcs. individual inclusions of bark particles per 1 m2 of slab size, mm: for grade I - from 3 to 10; for grade II - from 10 to 15.

4.5 Marking

4.5.1 Each batch of slabs must be accompanied by a quality document containing:

Name, trademark (if any) and location of the manufacturer;

Symbol of slabs;

Dimensions and number of slabs (in pieces, square and cubic meters);

Date of manufacture of the slabs;

Stamp of the technical control department.

It is allowed to apply additional markings when delivering for export.

4.5.2 The marking is applied to the edge of the slab and/or on the label of each package, and/or in the shipping documentation in the form of a clear stamp with dark dye, containing:

Name and (or) trademark of the manufacturer (if available);

National mark of conformity, if the product is certified;

Brand, grade, surface type and emission class;

Date of manufacture and shift number.

Transport marking - according to GOST 14192.

4.6 Packaging

4.6.1 The slabs are formed into packages. Slabs of the same size, brand, grade, type of surface according to the degree of processing are placed in packages.

4.6.2 Packages are formed on a pallet using top and bottom covers. Low-grade chipboards, wood-fiber boards, plywood or other material that protects products from mechanical and atmospheric influences are used as covers.

The dimensions of the upper and lower cover slabs must be no less than the dimensions of the packed slabs.

4.6.3 The height of the formed package is set taking into account the characteristics of lifting mechanisms and lifting capacity Vehicle, but not more than 1000 mm and weighing no more than 5000 kg.

4.6.4 Each package is fastened with transverse straps made of steel packaging tape with a width of at least 16 mm and a thickness of at least 0.5 mm in accordance with GOST 3560. The number of straps must be at least two (for a package height of up to 500 mm) and up to six (for a package height of package over 500 mm).

4.6.5 Transport packages - according to GOST 26663, GOST 24597 and others regulatory documents.

Means for fastening slabs in packaged form - in accordance with GOST 21650 and other regulatory documents.

4.6.6 By agreement with the consumer, another type of packaging is allowed.

4.6.7 Boards intended for use in the Far North and equivalent areas are packaged in accordance with GOST 15846.

5 Safety requirements and environmental protection

5.1 Boards must be manufactured using materials and components approved for their manufacture by national sanitary and epidemiological authorities.

5.2 Depending on the formaldehyde content, the boards are manufactured in two emission classes indicated in Table 4

Table 4

5.4 The production of slabs must meet safety requirements in accordance with GOST 12.1.004, GOST 12.4.009, GOST 12.1.014, GOST 12.3.042.

5.5 Persons associated with the production of slabs must be provided with funds personal protection according to GOST 12.4.011.

6 Acceptance rules

6.1 Plates are accepted in batches. A batch is considered to be the number of slabs of the same brand, size, grade, degree of processing and type of surface, the same hydrophobic properties and emission class, manufactured according to the same technological regime for a limited period of time (usually during one shift) and issued with one quality document.

6.2 Selection of slabs for quality control, dimensions and testing is carried out using a random “blind” selection method in accordance with GOST 18321.

6.3 To control dimensions, straightness, perpendicularity, surface quality and roughness (when monitoring using roughness samples), slabs are selected from each batch in the quantity indicated in Table 5.

Table 5

Batch volume, pcs.	Controlled indicator by
	3.1, 4.1, 4.2		4.3 (roughness), 4.4
	Sample size, pcs.	Acceptance number, pcs.	Sample size, pcs.	Acceptance number, pcs.
Up to 500
From 501 to 1200 incl.
» 1201 » 3200 »
» 3201 » 10000 »

6.4 To control physical and mechanical parameters (including roughness when controlled by a profilograph), slabs are selected from each batch in the quantity indicated in Table 6.

Table 6

Batch volume, pcs.	Sample size, pcs.	Acceptance constant k s
Up to 280		1,12
From 281 » 500 incl.		1,17
» 501 » 1200 »		1,24
"1201" 3200"		1,33
» 3201 » 10000 »		1,41

It is allowed to include in the sample slabs selected for control in accordance with 5.3, and also to distribute the test results of the physical and mechanical parameters of slabs manufactured according to one technological regime during one shift to the entire shift volume of workings, regardless of the grade of the slabs.

6.5 The “formaldehyde content” indicator is monitored on samples taken from one board at least once every 7 days, as well as when there is a change in the technological parameters of the production of boards or the binders used.

6.6 The batch is considered to comply with the requirements of this standard and is accepted if in the samples:

The number of slabs that do not meet the standard requirements in terms of size, straightness, perpendicularity, surface quality and roughness (when controlling roughness by samples) is less than or equal to the acceptance number established in Table 5;

The surface roughness of each sample, when controlled by a profilograph, must comply with the standards established in Table 2.

7 Test methods

7.1 General rules for testing to determine physical and mechanical parameters and sample preparation - according to GOST 10633.

7.2 Control of length, width, thickness - according to GOST 27680.

Perpendicularity control - according to GOST 27680 or by the difference in the lengths of diagonals across the face, measured with a metal tape with a division value of 1 mm according to GOST 7502.

Control of edge straightness - in accordance with GOST 27680 using a device or straight edge in accordance with GOST 8026 with a length of 1000 mm not lower than the second accuracy class and a set of styli No. 4 according to the regulatory document.

7.3 Density, maximum density deviation within the slab, humidity and thickness swelling are determined according to GOST 10634.

7.4 Ultimate strength and bending modulus of elasticity are determined according to GOST 10635.

7.5 Tensile strength perpendicular to the face of the slab is determined according to GOST 10636.

7.6 Specific resistance during normal separation of the outer layer - according to GOST 23234.

7.7 Specific resistance to pulling out screws is determined according to GOST 10637.

7.8 Warping - according to GOST 24053.

7.9 Surface roughness is determined according to GOST 15612 using a profilograph with a probe radius of 1.5 mm or using roughness samples.

7.10 The type of surface is determined from samples.

7.11 Formaldehyde content is determined according to GOST 27678. In case of disagreement in assessing product quality, tests are carried out using the photocolorimetric method according to GOST 27678.

7.12 The surface quality of the slabs is assessed visually.

7.13 Determination of the types of spots and waviness on the surface of the slab is carried out by comparison with samples approved in in the prescribed manner.

The surface area of the slab covered with stains is determined as the sum of the areas of individual spots on both sides of the slab.

To determine the spot area with an accuracy of 1 cm2, use a grid with square cells with a side of 10 mm, applied on a transparent sheet material. The accuracy of drawing grid lines is ± 0.5 mm. When calculating the number of cells overlapped by a spot, cells with an overlap of more than half of their area are counted as whole, and those with an overlap of less than half are not taken into account.

7.14 The depth of the recess and the height of the protrusions are determined using a dial indicator of the ICh-10 brand according to GOST 577, fixed in a metal U-shaped bracket with cylindrical supporting surfaces with a radius of (5 ± 1) mm and a span between supports of 60–80 mm.

The indicator scale is set to the zero position when installing the bracket on a straight edge in accordance with GOST 8026 or a calibration plate in accordance with GOST 10905.

The stroke of the indicator rod in both directions from the reference plane must be at least 2 mm.

7.15 The linear dimensions of bark inclusions, large chips, stains, corner chipping, edge chipping and scratch length are determined using a metal ruler in accordance with GOST 427.

8 Transportation and storage

8.1 The slabs are transported by all modes of transport in accordance with the rules for the carriage of goods in force for this type of transport with mandatory protection from precipitation and mechanical damage.

8.2 The slabs are stored in clean, closed rooms in a horizontal position in stacks up to 4.5 m high, consisting of stacks or packages separated by spacer bars with a thickness and width of at least 80 mm and a length of at least the width of the slab, or on pallets.

The difference in thickness of the gaskets used for one foot or package is allowed to be no more than 5 mm.

Spacer bars are laid across the slabs at intervals of no more than 600 mm in the same vertical planes.

The distance from the outer spacer bars to the ends of the slab should not exceed 250 mm.

9 Manufacturer's warranty

9.1 The manufacturer guarantees that the slabs comply with the requirements of this standard, subject to storage and transportation conditions, for a period of 12 months from the date of manufacture.

Appendix A

(informative)

Physical and mechanical properties of particle boards

Table A.1

Indicator name	Value for slab grade		Test method
	P-A	P-B
Density, kg/m3	550—820		According to GOST 10634
Swelling in thickness over 24 hours (sample size 100´100 mm), %, no more			According to GOST 10634
Specific resistance to pulling out screws, N/mm, ( Tn):			According to GOST 10637
made of plastic	55—35
from the edge	45—30
Impact strength, J/m 2	4000—8000		According to GOST 11842
Hardness, MPa	20—40		According to GOST 11843

Appendix B

Application of particle boards of various formaldehyde emission classes

Table B.1


Designation	GOST 10632-89
Title in Russian	Particle boards. Specifications
Title in English	Wood particle boards. Specifications
Effective date	01.01.1990
Date limit validity period	01.01.2009
OKS	79.060.20
OKP code	553400
KGS code	K23
OKSTU code	5534
Index of the GRNTI rubricator	663543
Abstract (scope of application)	This standard applies to general purpose particle boards made by hot flat pressing of wood particles mixed with a binder, used for the production of furniture, in construction (except housing construction, construction of buildings for children's, school and medical institutions), in mechanical engineering, radio instrument making and in the production of packaging. The standard does not apply to slabs with a lined or painted surface.
Keywords	particle boards; technical requirements ; physical and mechanical properties; acceptance ; tests; transportation; storage ;
Type of standard	Standards for products (services)
Type of requirements	Requirements for mandatory certification; The document is marked *
Designation of the replacement(s)	GOST 10632-77
Substitute designation	GOST 10632-2007
Normative references to: GOST	GOST 427-75; GOST 577-68; GOST 7502-89; GOST 8026-92; GOST 10633-78; GOST 10634-88; GOST 10635-88; GOST 10636-90; GOST 10637-78; GOST 10905-86; GOST 11842-76; GOST 11843-76; GOST 14192-96; GOST 15846-79; GOST 15612-85; GOST 18312-73; GOST 23234-78; GOST 24053-80; GOST 27678-88; GOST 27680-88; GOST 27935-88; GOST R 50460-92
Document submitted by CIS organization	USSR Ministry of Forestry
Rostekhregulirovaniya Department	320 - Department of Standardization and Certification of Raw Materials and Supplies
MND developer	Russian Federation
Interstate TC	121 - Particle boards
Last edition date	01.12.1997
Change number(s)	reissue with changes 1
Number of pages (original)	11
Organization - Developer	USSR Ministry of Forestry
Status	Replaced

Date of introduction 01.01.90

This standard applies to general-purpose particle boards made by hot flat pressing of wood particles mixed with a binder, used for the production of furniture, in construction (except for housing construction, construction of buildings for children's, school and medical institutions), in mechanical engineering, radio instrument making and in container production.

The use of slabs for specific types of products is established in agreement with sanitary and epidemiological supervision authorities in the relevant standards and technical conditions.

The standard does not apply to slabs with a lined or painted surface.

Mandatory requirements for particle boards, aimed at ensuring safety for life and health of the population and environmental protection, are set out in paragraphs.(in terms of the ultimate strength in bending and tension perpendicular to the face of the slab), p. , .

1.1. Plates are divided into:

according to physical and mechanical indicators - for grades P-A and P-B;

in terms of surface quality - grades I and II;

by type of surface - with a regular and fine-textured (M) surface;

according to the degree of surface treatment - polished (Ш) and unpolished;

in terms of hydrophobic properties - with normal and increased (B) water resistance;

(Changed edition, Amendment No. 1).

1.2. The dimensions of the slabs must correspond to those indicated in the table. .

Table 1

Notes:

1. The thickness of unground slabs is set as the sum of the nominal thickness of the ground slab and the grinding allowance, which should not be more than 1.5 mm .

2. It is allowed to produce slabs with dimensions smaller than the main ones by 200 mm with a gradation of 25 mm , in an amount of no more than 5% of the lot.

3. By agreement with the consumer, it is allowed to produce slabs in formats not specified in the table. .

1.3. The deviation from the straightness of the edges should not be more than 2 mm.

1.4. The deviation from the perpendicularity of the edges of the slabs should not be more than 2 mm per 1000 mm of edge length.

The perpendicularity of the edges can be determined by the difference in the lengths of the diagonals of the layer, which should not be more than 0.2% of the length of the slab.

1.5. Plates must be manufactured using synthetic resins approved by sanitary and epidemiological inspection authorities.

Under operating conditions, the amount of chemical substances released by the slabs should not exceed the maximum permissible concentrations in the environment approved by the sanitary and epidemiological supervision authorities for atmospheric air.

1.6. Physical and mechanical properties of slabs with a density from 550 kg/m 3 to 820 kg/m .

Reference values of physical and mechanical parameters of particle boards are given in the Appendix .

table 2

	Standard for slab grades
	P-A	P-B
Humidity, % Tn *
T in *
Swelling by thickness:
in 24 hours (sample size 100 100 mm), %, (T in)
in 2 hours (sample size 25 25 mm), %, (T in)**
Bending strength, MPa, for thicknesses, mm (T n):
from 8 to 12
» 13 » 19
» 20 » 30
Tensile strength perpendicular to the plate face, MPa, for thicknesses, mm (T n):
from 8 to 12	0,35	0,30
» 13 » 19	0,30
"20" 30	0,25
Specific resistance to pulling out screws, N/mm (T n)***:
made of plastic
» edges
Warp, mm (T in)
Surface roughness Rm, µm, no more, for samples a) with a dry surface:


for unsanded slabs
b) after 2 hours of soaking***:
for sanded boards with normal surface
for sanded boards with fine-textured surface
for unsanded slabs

* Tn and Tv are the lower and upper limits of the indicators, respectively.

** For slabs with increased water resistance.

*** Determined by agreement between the manufacturer and the consumer.

1.7. The surface quality of the slabs must comply with the standards specified in table. .

Table 3

	Standard for slabs
	polished, varieties		unpolished, grades

Indentations (protrusions) or scratches on the surface	Not allowed	No more than two are allowed per 1 m2 of surface	Allowed on an area of no more than 5% of the slab surface, depth (height), mm, no more than:
		depressions with a diameter of up to 20 mm and a depth of up to 0.3 mm or two scratches up to 200 mm long
Paraffin, oil and binder stains	Same	Spots with an area of no more than 1 cm are allowed on 1 m2 of the slab surface in the amount of 2 pieces.
Dust and resin stains		Allowed on an area of no more than 2% of the slab surface	Allowed
Chipped edges	Not allowed (single units with a face depth of 3 mm or less and an edge length of 15 mm or less are not taken into account)	Allowed within deviations along the length (width) of the slab
Corner chipping	Not allowed (edge length 3 mm or less is not taken into account)	Allowed within deviations along the length (width) of the slab
Grinding defects (under-grinding, over-grinding, linear grinding marks, surface waviness)	Not allowed	Allowed with an area of no more than 10% of the area of each face	Not defined
Individual inclusions of bark particles on the surface of the slab size, mm, no more
Individual inclusions of large chips:
for slabs with fine-textured surface	Allowed in quantities of 5 pieces. per 1 m slab size, mm:
	10-15	16-35	10-15	16-35
for slabs with normal surface	Not defined
Foreign inclusions	Not allowed

Note. Allowed for slabs with a regular surface no more than 5 pcs. individual inclusions of bark particles per 1 m 2 of slab size, mm: for grade I more than 3 to 10; for grade II - more than 10 to 15.

1.8. Depending on the formaldehyde content, the slabs are manufactured in two emission classes listed in table. .

Table 4

1.5-1.8. (Changed edition, Rev. №1).

1.9. The symbol for the slabs indicates:

brand;

variety;

type of surface (for slabs with a fine-textured surface);

degree of surface treatment (for polished slabs);

hydrophobic properties (for slabs of increased water resistance);

formaldehyde emission class;

length, width and thickness in millimeters;

designation of this standard.

Examples of symbols:

slab brand P-A first grades with a fine-textured surface, polished, emission class E1, sizes 3500 1750 15 mm:

P-A, I, M, Sh, E1, 3500 1750 15, GOST 10632-89.

The same, brand slabs P-B second grades with a regular surface, unpolished, emission class E2, sizes 3500 1750 16 mm:

P-B, II, E2, 3500 1750 16, GOST 10632-89.

1.10. A marking containing:

name and (or) trademark of the manufacturer;

brand, grade, surface type and emission class;

date of manufacture and shift number.

Boards for export are marked according to regulations technical documentation.

Certified products are marked with a national mark of conformity in accordance with GOST R 50460*.

*Valid on the territory of the Russian Federation.

(Changed edition, Amendment No. 1).

1.11. Boards intended for use in the Far North and equivalent areas are packaged according to .

For export, slabs are packaged in accordance with the requirements of foreign economic organizations.

2.1. Plates are accepted in batches. The batch must consist of slabs of the same brand, size, grade, degree of processing and type of surface, the same hydrophobic properties and emission class, manufactured according to the same technological regime, for a limited period of time (usually during one shift) and issued with one quality document containing:

name of the organization in whose system the manufacturer is included;

name and (or) trademark of the manufacturer and its address;

symbol of slabs;

average density slabs batch in kilograms per cubic meter;

number of slabs in a batch in pieces and square meters;

technical control stamp.

2.2. The quality and dimensions of the slabs in the batch are checked by selective control.

2.3. During random control, slabs are selected “blindly” according to .

2.4. To control dimensions, straightness, perpendicularity, surface quality and roughness (when monitoring using roughness samples), slabs are selected from each batch, depending on its volume, in the quantity indicated in the table. .

Table 5

PC.

	Controlled indicators by point:
	1.2, 1.3, 1.4		1.6 (roughness), 1.7
	sample size	acceptance number	sample size	acceptance number
Up to 500
From 501 » 1200
» 1201 » 3200
» 3201 » 10000

2.5. To control physical and mechanical parameters (including roughness when monitoring it with a profilograph), slabs are selected from each batch, depending on its volume, in the quantity indicated in the table. .

It is allowed to include in the sample slabs selected for control according to clause., as well as distribute the test results of the physical and mechanical parameters of slabs manufactured using one technological regime during one shift to the entire shift volume of workings, regardless of the grade of the slabs.

Table 6

	Sample size, pcs.	Acceptance constant
Up to 280		1,12
From 281 » 500		1,17
» 501 » 1200		1,24
» 1201 » 3200		1,33
» 3201 » 10000		1,41

2.6. The “formaldehyde content” indicator is monitored at least once every 7 days on samples taken from one slab.

2.7. The batch is considered to comply with the requirements of this standard and is accepted if, in the samples:

the number of slabs that do not meet the standard requirements in terms of size, straightness, perpendicularity, surface quality and roughness (when controlled by roughness samples) is less than or equal to the acceptance number established in table. ;

) for each physical and mechanical indicator are equal to or more than the acceptance constant (table). ; (1) , (2)

Where - sample average, calculated based on the test results of all slabs in the sample;

T n - lower limit indicators according to table. ;

T V - upper limit of indicators according to table. ;

S - standard deviation calculated from the average values of all tested slabs.

Results are rounded to the second decimal place.

;

The density of each slab is within the limits established in paragraph., and should not be lower than that specified in the quality document by more than 12%.

The surface roughness of each sample, when controlled by a profilograph, must comply with the standards established in table. .

(Changed edition, Rev. № 1).

3.1. General rules for testing to determine physical and mechanical parameters and sample preparation - according to .

3.2. Control of length, width, thickness - by .

Perpendicularity control - according to GOST 27680 or by the difference in the lengths of diagonals across the face, measured with a metal tape with a division value of 1 mm according to GOST 7502.

(Changed edition, Amendment No. 1).

3.3. Density, moisture content and thickness swelling are determined by .

3.4. The bending accuracy limit is determined by .

3.5. The tensile strength perpendicular to the slab layer is determined by .

3.6. Specific resistance to pulling out screws - according to .

3.7. Warping is determined by .

3.8. Surface roughness is determined by on a profiler with a probe radius of 1.5 mm or using roughness samples.

(Changed edition, Rev. № 1).

3.9. The type of surface is determined by samples.

3.10. Formaldehyde content is determined by .

3.11. The surface quality of the slabs is assessed visually.

3.12. Determination of the types of spots and waviness on the surface of the slab is carried out by comparison with samples approved in the prescribed manner.

The surface area of the slab covered with stains is determined as the sum of the areas of individual spots on both sides of the slab.

To determine the spot area with an accuracy of 1 cm2, use a grid with square cells with a side of 10 mm, applied on a transparent sheet material. The accuracy of drawing grid lines is ±0.5 mm. When calculating the number of cells overlapped by a spot, cells with an overlap of more than half of their area are counted as whole, and those with an overlap of less than half are not taken into account.

3.13. The depth of the recess and the height of the protrusions are determined using a dial indicator of the ICH-10 brand according to , fixed in a metal U-shaped bracket with cylindrical supporting surfaces with a radius of (5±1) mm and a span between supports of 60-80 mm.

The indicator scale is set to the zero position when installing the bracket on a straight edge in accordance with GOST 8026 or a calibration plate in accordance with GOST 10905.

The stroke of the indicator rod in both directions from the reference plane must be at least 2 mm.

3.14. The linear dimensions of bark inclusions, large chips, stains, corner chipping, edge chipping and the length of scratches are determined using a metal ruler according to .

4.1. The slabs are transported by all modes of transport in accordance with the Rules for the carriage of goods in force for this type of transport and the technical conditions for loading and securing cargo of the Ministry of Railways with mandatory protection of them from precipitation and mechanical damage.

4.2. Transport marking - by .

4.3. The slabs are stored indoors in a horizontal position in stacks up to 4.5 m high, consisting of stacks or packages separated by spacer bars with a thickness and width of at least 80 mm and a length of at least the width of the slab or pallets.

The difference in thickness of the gaskets used for one foot or package is allowed - 5 mm.

Spacer bars are laid across the slabs at intervals of no more than 600 mm in the same vertical planes.

The distance from the outer spacer bars to the ends of the slab should not exceed 250 mm.

ANNEX 1
Information

PHYSICAL AND MECHANICAL INDICATORS OF WOOD BOARDS

Indicator name	Values for brand slabs	Test method

Specific resistance to normal tearing of the outer layer, MPa, not less		According to GOST 23234
Modulus of elasticity at static bending, MPa		According to GOST 10635
Impact strength, J/m 2		According to GOST 11842
Hardness, MPa

APPENDIX 2
Information Q n FOR INDICATOR
BENDING STRENGTH

During one shift, 954 pieces were manufactured. particle boards 15mm thick.

The sample volume of slabs from a batch for testing is according to table.- 5 pieces.

From each selected slab, 8 samples are cut to determine the bending strength (according to GOST 10633).

Sample test results according to GOST 10635 (MPa):

1st plate 15.9; 15.1; 15.8; 17.3; 16.0; 16.4; 16.8; 18.1;

2nd » 16.8; 17.2; 17.0; 18.3; 18.0; 18.0; 17.4; 17.3;

3rd » 19.2; 19.0; 17.1; 19.5; 21.0; 18.9; 18.0; 18.5;

4th » 15.9; 17.9; 20.0; 19.1; 17.0; 17.3; 16.2; 16.0;

5th » 19.0; 19.0; 19.1; 19.8; 18.7; 18.8; 17.7; 18.8.

In accordance with GOST 10635, a sample average is calculated for each slab arithmetic value test results of all samples selected from this slab according to the formula k s= l ,24, which means that the batch of slabs complies with this standard in terms of bending strength.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Forestry Industry of the USSR

DEVELOPERS

O.E. Potashev, Ph.D. tech. sciences; A.F. Abelson, Cand., Tech. sciences; I.V. Pinthus

2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR according to standards dated 02.02.89 No. 13

3. INSTEAD GOST 10632-77

4. Date of the first inspection - 1994.

Inspection frequency - 5 years

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

	Item number, application


GOST 7502-89
GOST 8026-92
GOST 10633-78	, application
GOST 10634-88
GOST 10635-88	, application, application
GOST 10636-90
GOST 10637-78
GOST 10905-86
GOST 11842-76


GOST 15846-79
GOST 15612-85
GOST 18321-73
GOST 23234-78
GOST 24053-80
GOST 27678-88
GOST 27680-88
GOST 27935-88
GOST R 50460-92

6. The validity period was lifted according to Protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

7. REISSUE (December 1997) with Change No. 1, approved in April 1994 (IUS 7-94)

Directory of GOSTs, TUs, standards, norms and rules. SNiP, SanPiN, certification, technical specifications

Price 3 kopecks.

WOOD BOARDS

TECHNICAL CONDITIONS

GOST 10632-77

Official publication

USSR STATE COMMITTEE ON STANDARDS Moscow

UDC 674.815-41: 006.354 Group K23

STATE STANDARD OF THE USSR UNION

WOOD BOARDS Technical specifications

Wood particle boards. Technical specifications Instead

GOST 10632-GO

By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated February 18, 1977, Ng 420, the validity period was established

from 01/01/1978 to 01/01/1983

Failure to comply with the standard is punishable by law

This standard applies to particle boards made by hot flat pressing of wood particles mixed with a binder.

The standard does not apply to veneered and finished particle boards.

1. BRANDS, MAIN PARAMETERS AND SIZES

1.1. The slabs are divided into brands indicated in the table. 1. The areas of application of the slabs are given in recommended Appendix 1. Slabs of grade P-2 are manufactured in groups A and. B.

Table 1

Official publication Reproduction prohibited

Reissue. March 1979

Page 2 GOST 10632-77

1.2. The dimensions of the slabs must correspond to those indicated in the table. 2.

table 2

Note. By agreement with the consumer, it is allowed to produce unpolished slabs of grade P-2 with maximum thickness deviations of no more than ±0.9 mm.

The thickness at each measured point should not differ from the nominal thickness of the slab by more than the maximum deviations specified in the table. 2.

1.3. It is allowed to produce slabs of formats smaller than those indicated in the table. 2 by 200 mm with gradation through 25 mm, but in an amount not exceeding 5% of the supplied lot.

1.4. At the request of foreign trade associations, it is possible to produce slabs of other thicknesses.

1.5. By agreement with the consumer, it is allowed to produce slabs in formats not listed in the table. 2.

2. TECHNICAL REQUIREMENTS

2.1. The physical and mechanical properties and surface roughness of the slab must comply with the standards specified in table. 3. Non-standardized indicators of slabs are given in reference appendix 2.

2.2. Plates must be made using synthetic resins approved by the USSR Ministry of Health.

The slabs should not be highlighted in environment harmful chemicals in quantities exceeding permissible levels approved by the USSR Ministry of Health.

fdCT 16632-77 Page 3

2.3. The slabs must be cut at right angles on four sides.

The difference in the lengths of the diagonals across the face should not exceed ±0.2% of the length of the slab.

Table 3

Indicator name		Standard for slab grades

		Plate group

Humidity, %
Water absorption, %, no more		Not standardized
Swelling, %, no more: with normal water resistance with increased water resistance
Tensile strength perpendicular to the plate surface, MPa (kgf/cm2), not less
Ultimate strength during static bending, MPa (kgf/cm2), not less, for thicknesses, mm	from 10 to 14 incl.
	from 15 to 19 inclusive.
	20 or more
Hardness, MPa, (kgf/mm 2), not less		Not standardized
Density, kg/m 3
Surface roughness parameter Rz m ax of the surface according to GOST 7016-75, microns, no more, for slabs: unpolished polished polished with the state quality mark

* The class of surface roughness according to GOST 7016-75 is indicated in parentheses.

** The density of slabs of one batch is considered to be the average density of slabs selected for testing.

2.4. The surface quality of the slabs must comply with the standards specified in table. 4.

Table 4

Names defects	Standard for slabs
	polished \| unpolished
	with the state Quality Mark
	Slab brands
	P-1, P-2 groups A	P-1, P-2 and P-3
Gouges, protrusions and scratches	Not allowed		Admission; no more than a slab, deep	are at i e 5% pov (binoy (you no more than:	fHOSTI hundredth), mm,
Stains from binder, paraffin, oil	Not allowed		Allowed on an area of no more than 2 #% of the slab surface	Not allowed	Allowed on an area of no more than 2% of the slab surface
Individual inclusions of bark particles on the surface of slabs size, mm, no more

Chips at the edges are allowed within the limits of deviations in the length (width) of the slab.

angles

Notes;

1. The number of inclusions of bark particles larger than 6 mm for grade II slabs of grades P-2 and P-3 should not exceed 8 tit. per 0.01 m 2 surface.

2. Defects not listed in the table are not allowed.

2.5. Sanded particle boards of grades P-1 and P-2 of group A can be awarded the State Quality Mark in the prescribed manner.

2.6. Particle boards are supplied in sizes, grades, groups and grades in accordance with consumer specifications.

3. ACCEPTANCE RULES

GOST 10632-77 Page, 5

3.1. The slabs are presented for acceptance in batches. A batch is considered to be a quantity of slabs of the same brand, group, grade and size, documented in one quality document.

3.2. For check appearance and sizes, 10% of the slabs are selected from the batch, but not less than 20 pieces. For physical and mechanical tests, 1% of the slabs from the batch are selected, but not less than 3 pieces, in accordance with the requirements of GOST 10633-78.

Z."Z. The results of inspection and testing are considered final and apply to the entire batch.

3.4. Acceptance of slabs by quantity should be carried out in square meters. The area of one slab is determined with an error of no more than 0.01 m2.

4. TEST METHODS

4.1. The thickness of the slabs is measured at a distance of 25 mm from the edge of the slab with an error of no more than 0.1 mm at six points indicated in the drawing.

4.2. Humidity and density of slabs are determined according to GOST 10634-78.

4.3. Water absorption of slabs is determined according to GOST 10634-78.

4.4. Thickness swelling is determined according to GOST 10634-78.

4.5. The tensile strength perpendicular to the slab layer is determined according to GOST 10636-78.

4.6. The tensile strength during static bending is determined according to GOST 10635-78.

Page 6 tea imi-n

4.7. The hardness of the plates is determined according to GOST 11843-76.

4.8. The surface roughness parameter of the slabs is determined according to GOST 156112--78, using profilographs or profilometers or according to standards approved in the prescribed manner.

4.9. Each tested sample must meet the requirements of Table. 3.

4.10. The amount of chemical substances released from finished particle boards, as well as the frequency of monitoring, are determined by sanitary inspection authorities in accordance with current guidelines approved by the USSR Ministry of Health.

4.11. The length and width of the slabs are measured parallel to the edge at a distance of 25 mm from it with a metal measuring tape according to GOST 7502-69.

4.12. The appearance of the slabs is checked visually.

To control the number of inclusions of bark particles, select a section of the slab face with the largest number inclusions.

5. MARKING, TRANSPORTATION AND STORAGE

5.1. On longitudinal edge the slabs are clearly marked with the designation, group, grade, thickness of the slab, the name or trademark of the manufacturer, the designation of this standard, and the date of production of the slabs. When supplying slabs for export, markings are applied in accordance with an agreement with foreign trade associations.

On slabs that have been duly assigned the State Quality Mark, instead of the grade, an image of the Quality Mark in accordance with GOST 1.9-67 is applied.

5.2. Each batch of slabs must be accompanied by a document certifying its quality and containing:

name of the organization in whose system the manufacturer is included;

name of the manufacturer, its trademark and address;

designation and group of slabs;

type of slabs and sizes;

number of slabs in a batch;

date of manufacture of slabs and batch number;

test results;

designation of this standard.

5.3. The slabs must be transported in clean, dry vehicles with mandatory protection from precipitation and mechanical damage.

GOST 10632-77 Page 7

5.4. The slabs should be stored in dry, closed areas in stacks laid horizontally on level areas.

5.5. When delivered for export, the slabs must be packaged in accordance with the orders of foreign trade associations.

Areas of application of particle boards

	Areas of use
in the furniture industry	in construction	in other industries National economy	Types of cladding, finishing
Elements		Cases, panels and other parts in radio and instrument making	Films based on thermosetting polymers, films based on thermoplastic polymers and paint and varnish materials
Elements	Panels, building construction Temporary structures	Instrument and machine housings Containers (except food), containers, racks	Veneer, varnish, decorative paper and plastic Without cladding
	Structural elements of floors, roofs, wall panels, mezzanines, * window sills and others load-bearing elements designs	Parts of van bodies, carriage partitions and others	Veneer, decorative laminated paper, linoleum, etc. Without cladding

APPENDIX 2 Information

Physical and mechanical properties of particle boards (Approximate, not standardized)

Page and GOST 10632-77

Editor R. G. Goverdovskaya Technical editor F. I. Lisovsky Proofreader M. G. Bayrashevskaya

Delivered to embankment 06/07/79 Sub. in the oven 07/19/79 0.75 p.l. 0.52 academic publication l. Shooting gallery 8000 Price 3 kopecks.

Order "Badge of Honor" Standards Publishing House, Moscow, D-557, Novopresnensky Lane, 3. Vilnius Printing House Standards Publishing House, st. Mindaugo, 12/14. Zach. 2679

	Brands and groups of slabs

Indicator name
Modulus of elasticity at static bending, MPa (kgf/cm2)		1770-3920 (18000-40000)
Specific resistance to pulling out nails MPa (kgf/cm2):

GOST 10632-2007: Particle boards. Technical specifications (replaced by GOST 10632-2014)

Date of introduction 01/01/2009

GOST 10632-2007

UDC 674.815-41:006.354

Group K23

INTERSTATE COUNCIL FOR STANDARDIZATION,

METROLOGY AND CERTIFICATION

(MGS)

INTERSTATE COUNCIL FOR STANDARDIZATION,

METROLOGY AND CERTIFICATION

(ISC)

INTERSTATE STANDARD

WOOD-BOARD BOARDS

Specifications

Wood particle boards. Specifications

MKS 79.060.20

date introduction - 2009-01-01

Preface

Standard information

1 DEVELOPED by the Technical Committee for Standardization TK 121 “Woodboards”

2 INTRODUCED by the Federal Agency for Technical Regulation and Metrology

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Protocol No. 31 of June 8, 2007)

Short name of the country according to MK (ISO 3166) 004-97	Country code according to MK (ISO 3166) 004-97	Abbreviated name of the national standardization body
		Ministry of Trade and Economic Development
Belarus		State Standard of the Republic of Belarus
Kazakhstan		Gosstandart of the Republic of Kazakhstan
		Moldova-Standard
Russian Federation		Federal Agency for Technical Regulation and Metrology
Tajikistan		Tajikstandard
Uzbekistan		Uzstandard
		Gospotrebstandart of Ukraine

(Changed edition, Amendment 2008)

4 This standard takes into account the main regulations of the following international and European standards:

ISO 820:1975 “Wood-based particle boards. Definition and classification" (ISO 820:1975 "Particle boards - Definition and classification", NEQ);

EH 312:2003 “Particle boards. Technical specifications (EN 312:2003 “Particle boards - Specifications”, NEQ)

5 By Order of the Federal Agency for Technical Regulation and Metrology dated August 29, 2007 No. 219-st, the interstate standard GOST 10632-2007 was put into effect as a national standard of the Russian Federation on January 1, 2009.

6 INSTEAD GOST 10632-89

AMENDED (IUS No. 2 2008)

Information on the entry into force (termination) of this standard is published in the “National Standards” index.

1 Application area

This standard applies to general-purpose particle boards made by hot flat pressing of wood particles mixed with a binder (hereinafter referred to as boards) used in industry and construction.

The use of slabs for specific types of products is established in agreement with national sanitary and epidemiological surveillance authorities.

The standard does not apply to slabs for special purposes, as well as to slabs with a lined or painted surface.

This standard uses normative references to the following interstate standards:

GOST 12.1.004-91 System of occupational safety standards. Fire safety. General requirements

GOST 12.1.014-84 System of occupational safety standards. Work area air. Method for measuring concentrations of harmful substances using indicator tubes

GOST 12.3.042-88 System of occupational safety standards. Woodworking production. General safety requirements

GOST 12.4.009-83 System of occupational safety standards. Fire fighting equipment for the protection of objects. Main types. Accommodation and service

GOST 12.4.011-89 System of occupational safety standards. Protective equipment for workers. General requirements and classification

GOST 427-75 Metal measuring rulers. Specifications

GOST 577-68 Dial indicators with a division value of 0.01 mm. Specifications

GOST 3560-73 Steel packaging tape. Specifications

GOST 7502-98 Metal measuring tapes. Specifications

GOST 8026-92 Calibration rulers. Specifications

GOST 10633-78 Particle boards. General rules for preparing and conducting physical and mechanical tests

GOST 10634-88 Particle boards. Methods for determining physical properties

GOST 10635-88 Particle boards. Methods for determining the tensile strength and elastic modulus in bending

GOST 10636-90 Particle boards. Method for determining the tensile strength perpendicular to the plate face

GOST 10637-78 Particle boards. Method for determining the resistivity of pulling out nails and screws

GOST 10905-86 Testing and marking plates. Specifications

GOST 11842-76 Particle boards. Method for determining impact strength

GOST 11843-76 Particle boards. Hardness determination method

GOST 14192-96 Marking of cargo

GOST 15612-85 Products made of wood and wood materials. Methods for determining surface roughness parameters

GOST 15846-2002 Products sent to the Far North and equivalent areas. Packaging, labeling, transportation and storage

GOST 18321-73 Statistical quality control. Methods for random selection of samples of piece goods

GOST 21650-76 Means for fastening packaged cargo in transport packages. General requirements

GOST 23234-78 Particle boards. Method for determining the specific resistance to normal tearing of the outer layer

GOST 24053-80 Particle boards. Furniture parts. Method for determining warp

GOST 24597-81 Packages of packaged piece goods. Main parameters and dimensions

GOST 26663-85 Transport packages. Formation using packaging tools. General technical requirements

GOST 27678-88 Chipboards and plywood. Perforator method for determining formaldehyde content

GOST 27680-88 Chipboards and wood-fiber boards. Size and shape control methods

GOST 27935-88 Wood-fiber and particle boards. Terms and Definitions

Note - When using this standard, it is advisable to check the validity of the reference standards in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or according to the annually published information index “National Standards”, which was published as of January 1 of the current year , and according to the corresponding monthly information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Dimensions and classification

3.1 The nominal dimensions of the slabs and their deviations must correspond to those indicated in Table 1.

Table 1

In millimeters

3.2 Classification

3.2.1 Plates are divided into:

According to physical and mechanical indicators - for grades P-A and P-B;

In terms of surface quality - grades I and II;

According to the type of surface - with a regular and fine-textured (M) surface;

According to the degree of surface treatment - polished (Ш) and unpolished;

According to hydrophobic properties - with normal and increased (B) water resistance;

3.2.2 The symbol of the slabs must include: brand designation, grade, type of surface (for slabs with a fine-textured surface), degree of surface treatment (for polished slabs), hydrophobic properties (for slabs with increased water resistance), formaldehyde emission class, nominal length, width and thickness in millimeters, the designation of this standard.

Examples of symbols:

Plate grade P-A, grade I, with a fine-textured surface, polished, emission class E1, size 3500´1750´15 mm:

P-A,I, M, W, E1, 3500´ 1750 ´ 15, GOST 10632-2007

Plate grade P-B, grade II, with a regular surface, unpolished, emission class E2, size 3500´1750´16 mm:

P-B,II, E2, 3500´ 1750 ´ 16, GOST 10632-2007

4 Technical requirements

4.1 Deviation from edge straightness should not be more than 1.5 mm per 1 m of edge length.

4.2 Deviation from perpendicularity of the edges of the slabs should not be more than 2 mm per 1 m of edge length.

The perpendicularity of the edges can be determined by the difference in the lengths of the diagonals of the face, which should not be more than 0.2% of the length of the slab.

4.3 The physical and mechanical properties of the slabs must comply with the standards specified in Table 2.

table 2

Indicator name	Standard for slab grades
Indicator name
1 Humidity, %:


2 Maximum density deviation within the slab, no more**
3 Swelling in thickness over 2 hours (sample size 25´25 mm), %, ( T in)***
4 Ultimate bending strength, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.







5 Modulus of elasticity in bending, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.







6 Tensile strength perpendicular to the slab face, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.







7 Specific resistance to normal tearing of the outer layer, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.







8 Warp, mm ( T in)
9 Surface roughness Rm, µm, no more:
for sanded boards with normal surface
for sanded boards with fine-textured surface
for unsanded slabs**
* Tn And T in- lower and upper limits of indicators, respectively. Determined by agreement between the manufacturer and the consumer. * For slabs with increased water resistance.

Reference values of physical and mechanical parameters of particle boards are given in Appendix A.

4.4 The surface quality of the slabs must comply with the standards specified in Table 3.

Table 3

Defect according to GOST 27935	Standard for slabs
	polished, varieties		unpolished, grades

Depressions (protrusions), scratches on the surface	Not allowed	No more than 2 pieces are allowed per 1 m2 of slab surface. with a diameter of up to 20 mm and a depth (height) of up to 0.3 mm or two scratches up to 200 mm long	Allowed on an area of no more than 5% of the surface of the slab, with depth (height), mm no more than:

Paraffin, oil and binder stains	Not allowed	Spots with an area of no more than 2 cm2 are allowed on 1 m2 of the slab surface in the amount of 1 piece.
Dust and resin stains	Not allowed	Allowed on an area of no more than 2% of the slab surface	Allowed
Chipped edges	Not allowed (single units with a face depth of 3 mm or less and an edge length of 15 mm or less are not taken into account)	Allowed within deviations along the length (width) of the slab
Corner chipping	Not allowed (edge length 3 mm or less is not taken into account)	Allowed within deviations along the length (width) of the slab
Grinding defects (under-grinding, over-grinding, linear grinding marks, surface waviness)	Not allowed	Allowed area is no more than 10% of the area of each side of the slab	Not defined
Individual inclusions of bark particles on the surface of the slab size, mm, no more
Individual inclusions of large chips on the plate face size, mm:	Allowed in quantities of 5 pieces. per 1 m 2 plate size, mm:
for slabs with fine-textured surface
for slabs with normal surface	Not defined
Foreign inclusions	Not allowed
Note - Allowed for slabs with a regular surface is no more than 5 pcs. individual inclusions of bark particles per 1 m2 of slab size, mm: for grade I - from 3 to 10; for grade II - from 10 to 15.

4.5 Marking

4.5.1 Each batch of slabs must be accompanied by a quality document containing:

Name, trademark (if any) and location of the manufacturer;

Symbol of slabs;

Dimensions and number of slabs (in pieces, square and cubic meters);

Date of manufacture of the slabs;

Stamp of the technical control department.

It is allowed to apply additional markings when delivering for export.

4.5.2 The marking is applied to the edge of the slab and/or on the label of each package, and/or in the shipping documentation in the form of a clear stamp with dark dye, containing:

Name and (or) trademark of the manufacturer (if available);

National mark of conformity, if the product is certified;

Brand, grade, surface type and emission class;

Date of manufacture and shift number.

Transport marking - according to GOST 14192.

4.6 Packaging

4.6.1 The slabs are formed into packages. Slabs of the same size, brand, grade, type of surface according to the degree of processing are placed in packages.

The dimensions of the upper and lower cover slabs must be no less than the dimensions of the packed slabs.

4.6.3 The height of the formed package is set taking into account the characteristics of lifting mechanisms, the carrying capacity of vehicles, but not more than 1000 mm and weighing no more than 5000 kg.

4.6.5 Transport packages - in accordance with GOST 26663, GOST 24597 and other regulatory documents.

Means for fastening plates in packaged form - in accordance with GOST 21650 and other regulatory documents.

4.6.6 By agreement with the consumer, another type of packaging is allowed.

4.6.7 Boards intended for use in the Far North and equivalent areas are packaged in accordance with GOST 15846.

5 Safety requirements and environmental protection

5.1 Boards must be manufactured using materials and components approved for their manufacture by national sanitary and epidemiological authorities.

5.2 Depending on the formaldehyde content, the boards are manufactured in two emission classes indicated in Table 4

Table 4

5.4 The production of slabs must meet safety requirements in accordance with GOST 12.1.004, GOST 12.4.009, GOST 12.1.014, GOST 12.3.042.

5.5 Persons associated with the production of slabs must be provided with personal protective equipment in accordance with GOST 12.4.011.

6 Acceptance rules

6.2 Selection of slabs for quality control, dimensions and testing is carried out using a random “blind” selection method in accordance with GOST 18321.

Table 5

6.4 To control physical and mechanical parameters (including roughness when controlled by a profilograph), slabs are selected from each batch in the quantity indicated in Table 6.

Table 6

6.6 The batch is considered to comply with the requirements of this standard and is accepted if in the samples:

Values Qn And QV, calculated using formulas (2) and (3) for each physical and mechanical indicator, are equal to or more than the acceptance constant specified in Table 6.

Where X- sample average value calculated from the test results of all slabs in the sample;

Tn- lower limit of indicators according to table 2;

T in- upper limit of indicators according to table 2;

S- standard deviation calculated from the average values of all tested slabs.

Results are rounded to the second decimal place;