This part of GB/T4897 specifies the technical requirements, statistical calculation and determination methods, measurement and test methods, inspection rules, marking, packaging, transportation and storage, and marking of reinforced structural boards used in wet conditions. GB/T 4897.7-2003 Particleboard Part 7: Requirements for reinforced structural boards used in wet conditions GB/T4897.7-2003 Standard download decompression password: www.bzxz.net

ICS 79. 060. 20
National Standard of the People's Republic of China
GB/T4897.7—2003bzxz.net
Particleboard
Part 7: Requirements for heavy-duty load-bearingboards for use in humid conditions
Particleboard--Part 7: Requirements for heavy-duty load-bearingboards for use in humid conditions2003-01-27 Issued by the People's Republic of China, implemented on May 1, 2003, GB/T4897.7—2003. GB/T4897 Particleboard is divided into seven parts: Part 1: Common requirements for all board types; Foreword: Part 2: Requirements for ordinary boards used in a dry state; Part 3: Requirements for household and interior decoration boards used in a dry state; Part 4: Requirements for structural boards used in a dry state; Part 5: Requirements for structural boards used in a wet state; Part 6: Requirements for reinforced structural boards used in a dry state; Part 7: Requirements for reinforced structural boards used in a wet state. This part is Part 7 of GB/T4897 Particleboard. This part adopts the European standard EN312-7:1997 particleboard part 7: requirements for reinforced structural boards used in wet conditions. The physical and chemical performance indicators are the same as EN312-7 except for the increase in surface bonding strength and screw holding force. The dimensional change test items are not listed in this part. The water resistance test chooses the internal bonding strength after boiling for 2 hours. Compared with the previous version (GB/T4897-1992), the important technical change of GB/T4897-2003 particleboard is that the original standard is divided into seven parts, among which the requirements for structural boards used in wet conditions and the requirements for reinforced structural boards used in wet conditions are newly added contents. This part is a newly added section, and its technical requirements are slightly higher than those of Part 5. This part is proposed by the State Administration of Industry and Information Technology.
This part is under the jurisdiction of the National Technical Committee for Standardization of Wood-Based Panels. The responsible drafting unit of this part: Institute of Wood Industry, Chinese Academy of Forestry. Participating drafting units of this part: Beijing Timber Factory, Hebei Saibo Board Industry Group. Main drafters of this part: Chen Shangying, Long Ling, Zheng Fengshan, Zhang Zhanhao. This part was first issued in February 1985, revised for the first time in August 1992, and this is the second revision. This part is entrusted to the National Technical Committee for Standardization of Wood-Based Panels for interpretation. GB/T 4897.7--2003
Particleboard, Part 7: Requirements for reinforced structural boards used in wet conditions 1 Standard
This part of GB/T 4897 specifies the technical requirements, statistical calculation and determination methods, measurement and test methods, inspection rules, marking, packaging, transportation and storage, and marking of reinforced structural boards used in wet conditions. This part applies to the flower boards defined in 3 and 7 of GB497.1-2003. This part does not apply to the flower boards with clear direction (). 2 Normative references
The following documents have become clauses of this part through reference in this part of GB/T 4897. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part 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 part.
GB/T4897.1-2003 Particleboard Part 1: Common requirements for all board types GB/T4897.5-2003 Particleboard Part 5: Requirements for structural boards used in damp conditions GB/T17657--1999 Test methods for physical and chemical properties of artificial boards and veneered artificial boards 3 Technical requirements
3.1 Thickness, width, difference between two diagonals, curvature, appearance quality and common indicators shall comply with the requirements of 5.1 to 5.5 in GB/T 4897.1~-2003.
3.2 Physical and chemical performance indicators are shown in Table 1.
Degradation 1 Physical and chemical performance indicators
Static bending strength
Flexural elastic modulus
Internal bonding strength
Surface bonding strength
Internal bonding strength after 2h boiling water
24h water absorption thickness expansion rate
23 350
>13~-20
Nominal thickness range/mm
>20 25
22 900
>25~32
≥2 600
3.3 Screw force: The plate with a thickness of 16mm is used to measure the impact screw force. The plate surface holding force is 1100N, and the plate edge holding force is ≥800N. 4 Statistical calculation and judgment method
According to the provisions of Chapter 6 of GB/T4897.12003. 5 Measurement and test methods
5.1 Sampling and test piece dimensions
GB/T 4897.7--2003
According to 7.2 of CB/T 4897. 1-2003. 5.2 The determination of static bending strength and bending elastic modulus shall be carried out in accordance with 4 and 9 of GR/T17657..1999. 5.3 The determination of internal bonding strength
According to 4.8 of GB/T17657-1999. 5.4 The determination of surface shrinkage strength
According to 4.13 of GB/T17657-1999. 5.5 The determination of screw force
According to 4.10 of GB/T17657-1999. 5.624 Determination of water absorption thickness expansion rate
shall be carried out in accordance with 4.5 of GB/117657-1999. 5.72h internal bonding strength after boiling water
shall be carried out in accordance with 5.7 of (B/T4897.5-2003. 6 Inspection rules
shall be carried out in accordance with Chapter 8 of GB/T 4897.1-2003. 7 Marking, packaging, transportation and storage, marking shall be carried out in accordance with Chapter 9 of GB/T4897.1-2003.
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