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GB/T 4897-2015 English PDF (GBT4897-2015)

GB/T 4897-2015 English PDF (GBT4897-2015)

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GB/T 4897-2015: Particleboard

This Standard specifies the terms and definitions, classification, requirements, measurement and test methods, inspection rules, symbols, packaging, transportation and storage of the particleboards.
GB/T 4897-2015
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 79.060.20
B 70
Replacing GB/T 4897.1 ~ 4897.7-2003
Particleboard
?????????
[ISO 16893-2.2010, Wood-based panels - Particleboard ?€?
Part 2. Requirements, MOD]
ISSUED ON. JULY 3, 2015
IMPLEMENTED ON. FEBRUARY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification ... 8
5 Specification limits ... 8
6 Requirements ... 10
7 Measurement and test methods ... 19
8 Inspection rules ... 25
9 Symbols, packaging, transportation and storage ... 28
Annex A (Normative) Calculation of 5-percentile and 95-percentile values ... 29 Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009 and GB/T 20000.2-2009.
This Standard is an amendment to GB/T 4897.1~4897.7-2003. Compared with GB/T 4897.1~4897.7-2003, the major technical changes in this Standard are as follows.
?€? COMBINE the standard divided into seven parts into one.
?€? The particleboards are divided into six types of panels based on the
applications in previous edition, while they are divided into twelve types of panels in this Standard. Furthermore, ADD the property requirements
of six types of panels.
?€? MODIFY the classification and symbols.
?€? MODIFY the determination method.
?€? ADD the testing method of moisture resistance.
?€? The testing method and limit requirements of formaldehyde release use the provisions of GB 18580.
?€? ADD the verticality measurement. DELETE the diagonal measurement.
?€? ADD the flatness measurement. DELETE the warpage measurement.
?€? ADD the following terms and definitions. ?€?specification limit?€? and ?€?high humid conditions?€?.
?€? As additional property indicators, dimensional stability and sand content?€?s requirements shall be determined after consultation between supplier
and demander.
This Standard was redrafted by reference to ISO 16893-2.2010 Wood-based panels - Particleboard - Part 2. Requirements (EN) after modification.
Compared with ISO 16893-2.2010, the major differences between this
Standard and ISO 16893-2.2010 are as follows.
?€? MODIFY some expressions applicable to the international standards to
those applicable to China?€?s national standards.
?€? ADD the method for determining the properties of individual panel.
Particleboard
1 Scope
This Standard specifies the terms and definitions, classification, requirements, measurement and test methods, inspection rules, symbols, packaging,
transportation and storage of the particleboards.
This Standard is applicable to the general purpose particleboards, furniture grade particleboards, load bearing particleboards and heavy-duty load bearing particleboards.
This Standard is not applicable to the oriented strand boards.
2 Normative references
The following documents are essential to the application of this document. For dated references, only the editions with the dates indicated are applicable to this document. For undated references, only the latest editions (including all the amendments) are applicable to this document.
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (ISO 2859-1.1999, IDT)
GB/T 17657-2013 Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
GB/T 18259-2009 Terms of wood-based panel and its surface decoration
GB 18580 Indoor decorating and refurbishing materials - Limit of
formaldehyde emission of wood-based panels and finishing products
GB/T 19367-2009 Wood-based panels - Determination of dimensions of
panels
LY/T 1717-2007 Guide for sampling inspection of wood-based panels
4 Classification
4.1 Classification in accordance with the applications.
Type P1. General purpose particleboard for use in dry conditions;
Type P2. Furniture grade particleboard for use in dry conditions;
Type P3. Load bearing particleboard for use in dry conditions;
Type P4. Heavy-duty load bearing particleboard for use in dry conditions; Type P5. General purpose particleboard for use in humid conditions;
Type P6. Furniture grade particleboard for use in humid conditions;
Type P7. Load bearing particleboard for use in humid conditions;
Type P8. Heavy-duty load bearing particleboard for use in humid conditions; Type P9. General purpose particleboard for use in high humid conditions; Type P10. Furniture grade particleboard for use in high humid conditions; Type P11. Load bearing particleboard for use in high humid conditions;
Type P12. Heavy-duty load bearing particleboard for use in high humid
conditions.
4.2 Classification in accordance with the functions.
Flame retardant particleboard;
Pest control particleboard;
Antifungal particleboard, etc.
5 Specification limits
5.1 The specification limits of the products specified in this Standard are used for determining whether the unit product is conforming.
5.2 For the dimensional deviation, the numerical values in Table 1 refer to its specification limits. For the mid-panel density deviation and moisture content, the numerical values required in Sections 6.3.1.1 and 6.3.1.2 refer to their Static bending strength (MOR) MPa 12.0 11.0 11.0 10.5 9.5 7.0
Modulus of elasticity (MOE) MPa 1,900 1,800 1,600 1,500 1,350 1,050
Internal bonding strength MPa 0.45 0.40 0.35 0.30 0.25 0.20
Surface bonding strength MPa 0.8 0.8 0.8 0.8 0.8 0.8
Water-absorbent thickness
expansion ratio in 2h % 8.0
6.3.2.3 Load bearing particleboard for use in dry conditions (Type P3)
Other physical and mechanical properties of Type P3 shall conform to the provisions of Table 5.
Table 5 Requirements for Other Physical and Mechanical Properties of
Load Bearing Particleboard for Use in Dry Conditions
Item Unit
Specification limits (??U and ??L)
Basic thickness range
mm
??? 6 > 6 ~ 13 > 13 ~ 20 > 20 ~ 25 > 25 ~ 34 > 34
Static bending strength (MOR) MPa 15 15 15 13 11 8
Modulus of elasticity (MOE) MPa 2,200 2,200 2,100 1,900 1,700 1,200
Internal bonding strength MPa 0.45 0.40 0.35 0.30 0.25 0.20
Water-absorbent thickness
expansion ratio in 24h % 22.0 19.0 16.0 16.0 16.0 15.0
6.3.2.4 Heavy-duty load bearing particleboard for use in dry conditions (Type P4)
Other physical and mechanical properties of Type P4 shall conform to the provisions of Table 6.
Table 6 Requirements for Other Physical and Mechanical Properties of
Heavy-duty Load Bearing Particleboard for Use in Dry Conditions
Item Unit
Specification limits (??U and ??L)
Basic thickness range
mm
> 6 ~ 13 > 13 ~ 20 > 20 ~ 25 > 25 ~ 34 > 34
Static bending strength (MOR) MPa 20 18 16 15 13
Modulus of elasticity (MOE) MPa 3,100 2,900 2,550 2,400 2,100
Internal bonding strength MPa 0.60 0.50 0.40 0.35 0.25
Water-absorbent thickness
expansion ratio in 24h % 16.0 15.0 15.0 15.0 14.0
6.3.2.5 General purpose particleboard for use in humid conditions (Type P5)
Surface bonding strength MPa 0.8 0.8 0.8 0.8 0.8 0.8
Water-absorbent thickness
expansion ratio in 24h % 20.0 16.0 14.0 13.0 13.0 12.0
Moisture resistance
Option 1.
Internal bonding
strength after cyclic test
Water-absorbent
thickness expansion
ratio after cyclic test
MPa
0.18
20.0
0.15
18.0
0.13
16.0
0.12
14.0
0.10
13.0
0.09
11.0
Option 2.
Internal bonding
strength after boiling
MPa 0.09 0.09 0.08 0.07 0.07 0.06
Option 3.
Static bending strength
after the immersion
treatment in 70??C water
MPa 5.6 4.9 4.5 4.2 3.9 3.2
Note. SELECT the method after agreed upon by the supplier and demander. It is only necessary to select one of the three test items (options 1, 2 and 3).
6.3.2.7 Load bearing particleboard for use in humid conditions (Type P7) Other physical and mechanical properties of Type P7 shall conform to the provisions of Table 9.
Table 9 Requirements for Other Physical and Mechanical Properties of
Load Bearing Particleboard for Use in Humid Conditions
Item Unit
Specification limits (??U and ??L)
Basic thickness range
mm
??? 6 > 6 ~ 13 > 13 ~ 20 > 20 ~ 25 > 25 ~ 34 > 34
Static bending strength (MOR) MPa 18 17 16 14 12 9
Modulus of elasticity (MOE) MPa 2,450 2,450 2,400 2,100 1,900 1,550
Internal bonding strength MPa 0.50 0.45 0.40 0.35 0.30 0.30
Water-absorbent thickness
expansion ratio in 24h % 16.0 13.0 11.0 11.0 11.0 10.0
Moisture resistance
Option 1.
Internal bonding
strength after cyclic test
Water-absorbent
thickness expansion
ratio after cyclic test
MPa
0.23
16.0
0.20
15.0
0.20
13.0
0.18
12.0
0.16
11.0
0.14
10.0
Option 2. MPa 0.15 0.14 0.14 0.12 0.10 0.09
Surface bonding strength MPa 0.8 0.8 0.8 0.8 0.8 0.8
Water-absorbent thickness
expansion ratio in 24h % 14.0 12.0 12.0 10.0 ...

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