Some standard content:
LY/T 1611--2003
This standard adopts the European standard for similar products EMB/PS/HDF:1997 "Requirements for HDF for laminated and veneered flooring" (Requirements for HDF for laminated and veneered flooring). The main physical and chemical performance indicators (static bending strength, internal bonding strength, internal bonding strength after wet cycle) are consistent with those specified in EMB/PS/HDF:1997. This standard is proposed and managed by the National Technical Committee for Standardization of Wood-Based Panels. This standard is drafted by the Institute of Wood Industry, Chinese Academy of Forestry. The participating drafting units of this standard are: Beijing Senhua Wood-Based Panel Co., Ltd., Jixiang Man-Made Forest Products Co., Ltd., Jiangsu Danyang Wood-Based Panel Factory, and Yuehai (Zhanjiang) Medium Density Fiberboard Co., Ltd.
The main drafters of this standard are: Lv Bin, Zhou Meijian, Yang Zhijun, Wu Xiaojin, Chen Shengzu, and Zhang Xizhong. This standard is published for the first time.
1 Scope
Fiberboard for floor substrate
LY/T1611—2003
This standard specifies the definition, technical requirements, inspection plan and test methods, as well as marking, packaging, transportation, etc. of fiberboard for floor substrate. This standard applies to all kinds of fiberboard for floor substrate. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard. GB/T2828-1987 Sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T17657-1999 Test methods for physical and chemical properties of artificial boards and veneer artificial boards GB/T18102-2000 Impregnated paper laminated wood floor GB18580-2001 Limit of formaldehyde emission from artificial boards and their products for indoor decoration and furnishing GB/T19367.1-2003 Determination of thickness, width and length of artificial boards GB/T19367.2-2003 Determination of verticality and edge straightness of artificial boards 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Fiberboard for flooring A board made of wood fiber or other plant fiber as raw materials, aldehyde resin or other synthetic resin, and pressed under heating and high pressure conditions. Other suitable additives can be added to improve the characteristics of the board so that it can meet the requirements of the base material for flooring after veneer processing. Usually the thickness exceeds 5mm and the density is above 0.8og/cm, which is also called high-density fiberboard (HDF for short). 4 Classification and symbols
Fiberboards for floor substrates can be classified according to characteristics, applicable conditions or applicable scope. This standard is classified according to applicable conditions, see Table 1. Table 1 Classification of fiberboards for floor substrates
Ordinary type boards
Moisture-proof type boards
5 Technical requirements
5.1 Grading and classification
Symbol
HDF·H
Applicable conditions
Interior dry
Indoor humidity
Scope of application
Bedroom, living room, office, conference room, kitchen, corridor, hallway, etc.
The products are divided into superior products and qualified products according to appearance quality; and divided into E1 and E2 grades according to formaldehyde emission. 5.2 Appearance quality
The appearance quality of the product shall comply with the requirements of Table 2. 1
LY/T 1611—2003
Defect name
Break marks, cracks
Delamination, blistering
Local softness
Edge and corner defects
Number of pollution points such as paraffin spots and oil spots
Metal inclusions
5.3 Product specifications and dimensions and their deviations
5.3.1 Specifications and dimensions
Table 2 Appearance quality requirements
Defect regulations
Diameter ≤5mm
Width ≤10 mm
Diameter ≤4mm
Superior products
Not allowed
Not allowed
Not allowed
Length: 2440 mm, 2445 mm.2 450 mm.2 535 mm, 2800 mm mm allowable range
Not allowed
Not allowed
Not allowed
Not allowed
Width: 1220mm, 1230mm, 1240mm.1245mm.2070mm2440mmThickness: 5 mm～9 mm2
If the purchaser has special requirements, the supply and demand parties shall negotiate. 5.3.2 Dimension deviation
Shall comply with the provisions of Table 3.
Table 3 Dimension deviation
Length and width deviation
Thickness deviation
Verticality
Warp
Edge straightness
Note: The thickness of each measuring point in each plate shall not exceed its arithmetic mean ±0.10mm. 5.4 Quality requirements for fiberboard used as substrate for ordinary flooring 5.4.1
The physical and mechanical performance indicators of ordinary boards shall comply with the provisions of Table 4. Table 4 Physical and mechanical performance indicators of ordinary boards
Internal bonding strength
Static bending strength
Elastic modulus
Water absorption thickness expansion rate
Surface bonding strength
Dimensional stability
Moisture content
Qualified products
3 pieces/sheet
2 pieces/sheet
1 piece/sheet
Allowable deviation
Performance indicators
Density deviation inside the board
Formaldehyde emission limit See Table 5.
Table 4 (continued)
Table 5 Formaldehyde emission limit index
mg/100 g
mg/100g
5.5Quality requirements for fiberboard for moisture-proof floor substrate LY/T 1611--2003
Performance index
Limit value
The technical requirements for moisture-proof board shall comply with the corresponding provisions of 5.2, 5.3 and 5.4, among which the internal bonding strength in 5.4 shall be changed to the internal bonding strength after wet cycle, and its index shall be ≥0.30MPa.
Sampling and preparation of test pieces
6.1 Instrument
6.1.1 Micrometer, accuracy 0.01mm.
6.1.2 Vernier caliper, accuracy 0.05mm.
6.1.3 Balance, sensitivity 0.01g.
6.2 Sampling
The sample shall be extracted according to the provisions of 8.2.3. Five samples shall be cut as shown in Figure 1, of which samples 1, 2 and 3 are used to prepare the test specimens for physical and mechanical properties, and samples 4 and 5 are used to prepare the test specimens for formaldehyde emission. Unit: mm
6.3 Preparation of test specimens
Sample 4
Sample 5
Sample 3-
Sample length
Figure 1 Schematic diagram of sample cutting
Sample 1
Sample 2
The test specimens shall be prepared from samples 1, 2 and 3 according to the provisions of Figure 2. If there are defects at the specified position, the preparation position of the test specimens can be appropriately moved. The size, quantity and number of the test specimens are shown in Table 6. The edges of the test specimens shall be straight, and the adjacent sides shall be at right angles. The measurement of the test specimen dimensions shall be carried out according to the method specified in 4.1 of GB/T17657-1999.
LY/T1611—2003
Nominal thickness of test piece.
Test items
Density and density deviation
Moisture content
Thickness expansion rate after water absorption
Internal bonding strength
Static bending strength
Elastic modulus
Surface bonding strength
Dimensional stability
Formaldehyde release
Test method
50 1 50
50 50 , 50
20h+50
Sketch of specimen preparation
Size and quantity of specimen
Size of specimen/mm
100×100
100X100
50×50
50×50wwW.bzxz.Net
Length 20h+50 (not less than
150 mm), width 50
50×50
200×20
20×20
7.1. Thickness, width and length of the plate. Number of test pieces
3 in vertical and horizontal directions
6 in vertical and horizontal directions
According to the provisions of 5.1 and 5.2 in GB/T19367.1-2003. 7.2. Verticality measurement of the plate
According to the provisions of 5.1 in GB/T19367.2-2003. 7.3. Warpage measurement
Unit: mm
Nominal thickness of the test piece
Place the plate with the concave surface facing up on the horizontal inspection table, place the side of a steel ruler with a length of 1000mm vertically on the concave surface of the plate, and use a feeler gauge to measure its maximum chord height, accurate to 0.1mm. 7.4. Edge straightness measurement
According to the provisions of GB/T19367.2-2003. 7.5 Density determination
7.5.1 Carry out in accordance with the provisions of 4.2 of GB/T17657-1999. 7.5.2 The density deviation △o (%) in the board shall be calculated according to formula (1), accurate to 0.1%. Ap = Lemax (or min) - p]/p × 100 Where:
Density deviation in the board, %;
Pmax maximum density, unit is gram per cubic centimeter (g/cm2); Omin
-minimum density, unit is gram per cubic centimeter (g/cm2); average density, unit is gram per cubic centimeter (g/cm2). 7.6 Determination of moisture content
Carry out in accordance with the provisions of 4.3 of GB/T17657-1999. 7.7 Determination of water absorption thickness expansion rate
Carry out in accordance with the provisions of 4.5 of GB/T17657-1999. Soaking time 24h±5min. 7.8 Determination of internal bonding strength
Perform according to 4.8 of GB/T17657-1999. 7.9 Determination of static bending strength and elastic modulus
Perform according to 4.9 of GB/T17657--1999. 7.10 Determination of formaldehyde emission
Perform according to the perforation extraction method of GB18580-2001. 7.11 Determination of surface bonding strength
Perform according to 4.13 of GB/T17657-1999. 7.12 Determination of dimensional stability
Perform according to 6.3.10 of GB/T18102-2000. 7.13 Wet cycle test
Perform according to 4.25 of GB/T17657-1999. 8 Inspection rules
8.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 8.1.1 Factory inspection includes the following items:
a) Appearance quality;
Specifications and dimensions;
Physical properties: density, density deviation within the board, moisture content, water absorption thickness expansion rate; c)
Mechanical properties: static bending strength, elastic modulus, internal bonding strength. 8.1.2
Type inspection includes all items of factory inspection and adds the following items: a)
Physical properties: dimensional stability;
Mechanical properties: surface bonding strength, wet cycle internal bonding strength; formaldehyde release.
8.1.3 Type inspection shall be conducted in any of the following cases: a)
When there are major changes in raw and auxiliary materials and production processes; when production is resumed after a long period of suspension;
LY/T 1611--2003
LY/T 1611—2003
c) During normal production, inspection shall be conducted no less than four times a year; d) When the technical supervision department proposes type inspection requirements. 8.2 Sampling methods and judgment principles
8.2.1 Appearance quality inspection
The sub-sampling plan in GB/T2828-1987 shall be adopted, with the inspection level of II and the qualified quality level of 4.0, as shown in Table 7. Table 7 Sampling plan for surface appearance quality
Batch range
91~150
151~~280
281～500
501～1200
1 201 ~3 200
3 201~~10 000
10001~35000
8.2.2 Specification and dimension inspection
Number of samples
Number of qualified judgments
Number of unqualified judgments
Number of qualified samples
The sub-sampling plan in GB/T 2828-1987 is adopted, with the inspection level of S-4 and the qualified quality level of 6.5, see Table 8. Table 8 Sampling plan for specifications and sizes
Batch range
91～150
151~280
281500
501～1 200
1 201 ~～3 200
3201~~10 000
10001~35000
Number of samples
8.2.3 Number of qualified judgments for physical and mechanical properties and formaldehyde emission
Products of the same shift, the same specification and the same type are considered as one batch. Number of unqualified judgments
Number of qualified samples
In each batch of products, randomly select at least one sample for testing. The physical and mechanical properties and formaldehyde emission of each sample shall meet the requirements of the corresponding category and grade. If one of the indicators is unqualified, it is allowed to double sample and re-test once in the batch of products. If one of the indicators is still unqualified after re-test, the batch of products shall be judged as unqualified. 8.2.3.1 The density, moisture content, elastic modulus, formaldehyde emission test average value and density deviation within the board of the sample meet the requirements of the standard, and the density, moisture content, elastic modulus, formaldehyde emission and density deviation within the board of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.2 The static bending strength, internal bonding strength and surface bonding strength test average value of the sample meet the requirements of the standard, and the minimum value is not less than 80% of the value specified in the standard, and the static bending strength, internal bonding strength and surface bonding strength of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.3 The water absorption thickness expansion rate and dimensional stability test average value of the sample meet the requirements of the standard, and the maximum value is not more than 120% of the value specified in the standard, and the water absorption thickness expansion rate and dimensional stability of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.3 If the product's appearance quality, specifications, dimensions, physical and mechanical properties, formaldehyde emission and other properties meet the requirements of the corresponding category and grade, the batch of products shall be judged as qualified; otherwise, it shall be judged as unqualified. 8.4 The product is measured in cubic meters (the allowable deviation shall not be included). It should be accurate to 0.01m when delivered in batches, and accurate to 0.00001m when measuring a single sheet.
9 Marking, packaging, transportation, storage and identification 9.1 Marking
The product shall be stamped with a mark indicating the type, grade, production date and inspector code. 9.2 Packaging
LY/T 1611--2003
The products shall be packaged separately according to different types, specifications and grades. Each package shall be hung with a label indicating the manufacturer's name, product name, type, trademark, specification, grade, number of sheets and product standard number. 9.3 Transportation and storage
During transportation and storage, the product should be carefully placed flat and protected from moisture, rain, sunlight and impact. 9.4 Identification
Table 9 specifies the color identification of fiberboards for different types of floor substrates. Table 9 Board color identification
Fiberboard types for floor substrates
Ordinary board
Moisture-proof board
Symbol
HDF·H7 Determination of water absorption thickness expansion rate
Perform according to 4.5 of GB/T17657-1999. Soaking time 24h±5min. 7.8 Determination of internal bonding strength
Perform according to 4.8 of GB/T17657-1999. 7.9 Determination of static bending strength and elastic modulus
Perform according to 4.9 of GB/T17657-1999. 7.10 Determination of formaldehyde release
Perform according to the perforation extraction method of GB18580-2001. 7.11 Determination of surface bonding strength
Perform according to 4.13 of GB/T17657-1999. 7.12 Determination of dimensional stability
Perform according to 6.3.10 of GB/T18102-2000. 7.13 Wet cycle test
It shall be carried out in accordance with the provisions of 4.25 of GB/T17657-1999. 8 Inspection rules
8.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 8.1.1 Factory inspection includes the following items:
a) Appearance quality;
Specifications and dimensions;
Physical properties: density, density deviation within the board, moisture content, water absorption thickness expansion rate; c)
Mechanical properties: static bending strength, elastic modulus, internal bonding strength. 8.1.2
Type inspection includes all items of factory inspection and adds the following items: a)
Physical properties: dimensional stability;
Mechanical properties: surface bonding strength, wet cycle internal bonding strength; formaldehyde release.
8.1.3 Type inspection shall be conducted in any of the following cases: a)
When there are major changes in raw and auxiliary materials and production processes; when production is resumed after a long period of suspension;
LY/T 1611--2003
LY/T 1611—2003
c) During normal production, inspection shall be conducted no less than four times a year; d) When the technical supervision department proposes type inspection requirements. 8.2 Sampling methods and judgment principles
8.2.1 Appearance quality inspection
The sub-sampling plan in GB/T2828-1987 shall be adopted, with the inspection level of II and the qualified quality level of 4.0, as shown in Table 7. Table 7 Sampling plan for surface appearance quality
Batch range
91~150
151~~280
281～500
501～1200
1 201 ~3 200
3 201~~10 000
10001~35000
8.2.2 Specification and dimension inspection
Number of samples
Number of qualified judgments
Number of unqualified judgments
Number of qualified samples
The sub-sampling plan in GB/T 2828-1987 is adopted, with the inspection level of S-4 and the qualified quality level of 6.5, see Table 8. Table 8 Sampling plan for specifications and sizes
Batch range
91～150
151~280
281500
501～1 200
1 201 ~～3 200
3201~~10 000
10001~35000
Number of samples
8.2.3 Number of qualified judgments for physical and mechanical properties and formaldehyde emission
Products of the same shift, the same specification and the same type are considered as one batch. Number of unqualified judgments
Number of qualified samples
In each batch of products, randomly select at least one sample for testing. The physical and mechanical properties and formaldehyde emission of each sample shall meet the requirements of the corresponding category and grade. If one of the indicators is unqualified, it is allowed to double sample and re-test once in the batch of products. If one of the indicators is still unqualified after re-test, the batch of products shall be judged as unqualified. 8.2.3.1 The density, moisture content, elastic modulus, formaldehyde emission test average value and density deviation within the board of the sample meet the requirements of the standard, and the density, moisture content, elastic modulus, formaldehyde emission and density deviation within the board of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.2 The static bending strength, internal bonding strength and surface bonding strength test average value of the sample meet the requirements of the standard, and the minimum value is not less than 80% of the value specified in the standard, and the static bending strength, internal bonding strength and surface bonding strength of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.3 The water absorption thickness expansion rate and dimensional stability test average value of the sample meet the requirements of the standard, and the maximum value is not more than 120% of the value specified in the standard, and the water absorption thickness expansion rate and dimensional stability of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.3 If the product's appearance quality, specifications, dimensions, physical and mechanical properties, formaldehyde emission and other properties meet the requirements of the corresponding category and grade, the batch of products shall be judged as qualified; otherwise, it shall be judged as unqualified. 8.4 The product is measured in cubic meters (the allowable deviation shall not be included). When delivered in batches, it should be accurate to 0.01m, and when measuring a single sheet, it should be accurate to 0.00001m.
9 Marking, packaging, transportation, storage and identification 9.1 Marking
The product shall be stamped with a mark indicating the type, grade, production date and inspector code. 9.2 Packaging
LY/T 1611--2003
The products shall be packaged according to different types, specifications and grades. Each package shall be hung with a label indicating the manufacturer's name, product name, type, trademark, specification, grade, number of sheets and product standard number. 9.3 Transportation and storage
During transportation and storage, the product should be carefully placed flat and protected from moisture, rain, sunlight and impact. 9.4 Identification
Table 9 specifies the color identification of fiberboards for different types of floor substrates. Table 9 Board color identification
Fiberboard types for floor substrates
Ordinary board
Moisture-proof board
Symbol
HDF·H7 Determination of water absorption thickness expansion rate
Perform according to 4.5 of GB/T17657-1999. Soaking time 24h±5min. 7.8 Determination of internal bonding strength
Perform according to 4.8 of GB/T17657-1999. 7.9 Determination of static bending strength and elastic modulus
Perform according to 4.9 of GB/T17657-1999. 7.10 Determination of formaldehyde release
Perform according to the perforation extraction method of GB18580-2001. 7.11 Determination of surface bonding strength
Perform according to 4.13 of GB/T17657-1999. 7.12 Determination of dimensional stability
Perform according to 6.3.10 of GB/T18102-2000. 7.13 Wet cycle test
It shall be carried out in accordance with the provisions of 4.25 of GB/T17657-1999. 8 Inspection rules
8.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 8.1.1 Factory inspection includes the following items:
a) Appearance quality;
Specifications and dimensions;
Physical properties: density, density deviation within the board, moisture content, water absorption thickness expansion rate; c)
Mechanical properties: static bending strength, elastic modulus, internal bonding strength. 8.1.2
Type inspection includes all items of factory inspection and adds the following items: a)
Physical properties: dimensional stability;
Mechanical properties: surface bonding strength, wet cycle internal bonding strength; formaldehyde release.
8.1.3 Type inspection shall be conducted in any of the following cases: a)
When there are major changes in raw and auxiliary materials and production processes; when production is resumed after a long period of suspension;
LY/T 1611--2003
LY/T 1611—2003
c) During normal production, inspection shall be conducted no less than four times a year; d) When the technical supervision department proposes type inspection requirements. 8.2 Sampling methods and judgment principles
8.2.1 Appearance quality inspection
The sub-sampling plan in GB/T2828-1987 shall be adopted, with the inspection level of II and the qualified quality level of 4.0, as shown in Table 7. Table 7 Sampling plan for surface appearance quality
Batch range
91~150
151~~280
281～500
501～1200
1 201 ~3 200
3 201~~10 000
10001~35000
8.2.2 Specification and dimension inspection
Number of samples
Number of qualified judgments
Number of unqualified judgments
Number of qualified samples
The sub-sampling plan in GB/T 2828-1987 is adopted, with the inspection level of S-4 and the qualified quality level of 6.5, see Table 8. Table 8 Sampling plan for specifications and sizes
Batch range
91～150
151~280
281500
501～1 200
1 201 ~～3 200
3201~~10 000
10001~35000
Number of samples
8.2.3 Number of qualified judgments for physical and mechanical properties and formaldehyde emission
Products of the same shift, the same specification and the same type are considered as one batch. Number of unqualified judgments
Number of qualified samples
In each batch of products, randomly select at least one sample for testing. The physical and mechanical properties and formaldehyde emission of each sample shall meet the requirements of the corresponding category and grade. If one of the indicators is unqualified, it is allowed to double sample and re-test once in the batch of products. If one of the indicators is still unqualified after re-test, the batch of products shall be judged as unqualified. 8.2.3.1 The density, moisture content, elastic modulus, formaldehyde emission test average value and density deviation within the board of the sample meet the requirements of the standard, and the density, moisture content, elastic modulus, formaldehyde emission and density deviation within the board of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.2 The static bending strength, internal bonding strength and surface bonding strength test average value of the sample meet the requirements of the standard, and the minimum value is not less than 80% of the value specified in the standard, and the static bending strength, internal bonding strength and surface bonding strength of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.3 The water absorption thickness expansion rate and dimensional stability test average value of the sample meet the requirements of the standard, and the maximum value is not more than 120% of the value specified in the standard, and the water absorption thickness expansion rate and dimensional stability of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.3 If the product's appearance quality, specifications, dimensions, physical and mechanical properties, formaldehyde emission and other properties meet the requirements of the corresponding category and grade, the batch of products shall be judged as qualified; otherwise, it shall be judged as unqualified. 8.4 The product is measured in cubic meters (the allowable deviation shall not be included). It should be accurate to 0.01m when delivered in batches, and accurate to 0.00001m when measuring a single sheet.
9 Marking, packaging, transportation, storage and identification 9.1 Marking
The product shall be stamped with a mark indicating the type, grade, production date and inspector code. 9.2 Packaging
LY/T 1611--2003
The products shall be packaged separately according to different types, specifications and grades. Each package shall be hung with a label indicating the manufacturer's name, product name, type, trademark, specification, grade, number of sheets and product standard number. 9.3 Transportation and storage
During transportation and storage, the product should be carefully placed flat and protected from moisture, rain, sunlight and impact. 9.4 Identification
Table 9 specifies the color identification of fiberboards for different types of floor substrates. Table 9 Board color identification
Fiberboard types for floor substrates
Ordinary board
Moisture-proof board
Symbol
HDF·H2 Specification and size inspection
Number of samples
Number of qualified judgments
Number of unqualified judgments
Number of qualified samples
The sub-sampling plan in GB/T2828-1987 is adopted, with the inspection level of S-4 and the qualified quality level of 6.5, see Table 8. Table 8 Sampling plan for specifications and sizes
Batch range
91～150
151~280
281500
501～1 200
1 201 ~～3 200
3201~~10 000
10001~35000
Number of samples
8.2.3 Number of qualified judgments for physical and mechanical properties and formaldehyde emission
Products of the same shift, the same specification and the same type are considered as one batch. Number of unqualified judgments
Number of qualified samples
In each batch of products, randomly select at least one sample for testing. The physical and mechanical properties and formaldehyde emission of each sample shall meet the requirements of the corresponding category and grade. If one of the indicators is unqualified, it is allowed to double sample and re-test once in the batch of products. If one of the indicators is still unqualified after re-test, the batch of products shall be judged as unqualified. 8.2.3.1 The density, moisture content, elastic modulus, formaldehyde emission test average value and density deviation within the board of the sample meet the requirements of the standard, and the density, moisture content, elastic modulus, formaldehyde emission and density deviation within the board of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.2 The static bending strength, internal bonding strength and surface bonding strength test average value of the sample meet the requirements of the standard, and the minimum value is not less than 80% of the value specified in the standard, and the static bending strength, internal bonding strength and surface bonding strength of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.3 The water absorption thickness expansion rate and dimensional stability test average value of the sample meet the requirements of the standard, and the maximum value is not more than 120% of the value specified in the standard, and the water absorption thickness expansion rate and dimensional stability of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.3 If the product's appearance quality, specifications, dimensions, physical and mechanical properties, formaldehyde emission and other properties meet the requirements of the corresponding category and grade, the batch of products shall be judged as qualified; otherwise, it shall be judged as unqualified. 8.4 The product is measured in cubic meters (the allowable deviation shall not be included). It should be accurate to 0.01m when delivered in batches, and accurate to 0.00001m when measuring a single sheet.
9 Marking, packaging, transportation, storage and identification 9.1 Marking
The product shall be stamped with a mark indicating the type, grade, production date and inspector code. 9.2 Packaging
LY/T 1611--2003
The products shall be packaged separately according to different types, specifications and grades. Each package shall be hung with a label indicating the manufacturer's name, product name, type, trademark, specification, grade, number of sheets and product standard number. 9.3 Transportation and storage
During transportation and storage, the product should be carefully placed flat and protected from moisture, rain, sunlight and impact. 9.4 Identification
Table 9 specifies the color identification of fiberboards for different types of floor substrates. Table 9 Board color identification
Fiberboard types for floor substrates
Ordinary board
Moisture-proof board
Symbol
HDF·H2 Specification and size inspection
Number of samples
Number of qualified judgments
Number of unqualified judgments
Number of qualified samples
The sub-sampling plan in GB/T2828-1987 is adopted, with the inspection level of S-4 and the qualified quality level of 6.5, see Table 8. Table 8 Sampling plan for specifications and sizes
Batch range
91～150
151~280
281500
501～1 200
1 201 ~～3 200
3201~~10 000
10001~35000
Number of samples
8.2.3 Number of qualified judgments for physical and mechanical properties and formaldehyde emission
Products of the same shift, the same specification and the same type are considered as one batch. Number of unqualified judgments
Number of qualified samples
In each batch of products, randomly select at least one sample for testing. The physical and mechanical properties and formaldehyde emission of each sample shall meet the requirements of the corresponding category and grade. If one of the indicators is unqualified, it is allowed to double sample and re-test once in the batch of products. If one of the indicators is still unqualified after re-test, the batch of products shall be judged as unqualified. 8.2.3.1 The density, moisture content, elastic modulus, formaldehyde emission test average value and density deviation within the board of the sample meet the requirements of the standard, and the density, moisture content, elastic modulus, formaldehyde emission and density deviation within the board of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.2 The static bending strength, internal bonding strength and surface bonding strength test average value of the sample meet the requirements of the standard, and the minimum value is not less than 80% of the value specified in the standard, and the static bending strength, internal bonding strength and surface bonding strength of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.2.3.3 The water absorption thickness expansion rate and dimensional stability test average value of the sample meet the requirements of the standard, and the maximum value is not more than 120% of the value specified in the standard, and the water absorption thickness expansion rate and dimensional stability of the sample are judged to be qualified; otherwise, it is judged to be unqualified. 8.3 If the product's appearance quality, specifications, dimensions, physical and mechanical properties, formaldehyde emission and other properties meet the requirements of the corresponding category and grade, the batch of products shall be judged as qualified; otherwise, it shall be judged as unqualified. 8.4 The product is measured in cubic meters (the allowable deviation shall not be included). It should be accurate to 0.01m when delivered in batches, and accurate to 0.00001m when measuring a single sheet.
9 Marking, packaging, transportation, storage and identification 9.1 Marking
The product shall be stamped with a mark indicating the type, grade, production date and inspector code. 9.2 Packaging
LY/T 1611--2003
The products shall be packaged separately according to different types, specifications and grades. Each package shall be hung with a label indicating the manufacturer's name, product name, type, trademark, specification, grade, number of sheets and product standard number. 9.3 Transportation and storage
During transportation and storage, the product should be carefully placed flat and protected from moisture, rain, sunlight and impact. 9.4 Identification
Table 9 specifies the color identification of fiberboards for different types of floor substrates. Table 9 Board color identification
Fiberboard types for floor substrates
Ordinary board
Moisture-proof board
Symbol
HDF·H
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