GB/T 21723-2021 English PDF

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GB/T 21723-2021: Wheat(rice)-straw particleboard
Status: Valid

GB/T 21723: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21723-2021	269	Add to Cart	3 days	Wheat(rice)-straw particleboard	Valid
GB/T 21723-2008	359	Add to Cart	3 days	Wheat/rice-straw particleboard	Obsolete

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GB 18580   GB/T 19367   GB 18580   GB/T 45245   

Basic data

Standard ID: GB/T 21723-2021 (GB/T21723-2021)
Description (Translated English): Wheat(rice)-straw particleboard
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B70
Word Count Estimation: 13,117
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21723-2021: Wheat(rice)-straw particleboard

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Wheat(rice)-straw particleboard ICS 79:060:20 CCSB70 National Standards of People's Republic of China Replaces GB/T 21723-2008 Wheat (rice) straw particle board Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document replaces GB/T 21723-2008 "Wheat (rice) Straw Particleboard": Compared with GB/T 21723-2008, except for structural adjustment and In addition to editorial changes, the main technical changes are as follows: --- Changed the definition of wheat (rice) straw particleboard, "with isocyanate (MDI) resin as adhesive" was adjusted to "with isocyanate resin" for adhesives" (see 3:1, 3:1 of the:2008 edition); --- Added two terms "three-layer structure wheat (rice) straw particleboard" and "gradual structure wheat (rice) straw particleboard" (see 3:3, 3:4); --- Changed the definition of "hollow structure wheat (rice) straw particleboard" (see 3:5, 3:3 of the:2008 edition); --- Changed the nominal thickness division of wheat (rice) straw particleboard, and the nominal thickness ranges "3< t≤4" and "4< t≤6" were merged into "t≤6" (see Table 3 of 5:3, Table 3 of 5:3 of the:2008 edition); --- Changed the 2h water absorption thickness expansion rate requirement of wheat (rice) straw particleboard, from "≤6:0%" to "≤8:0%" [see 5:3 of Table 3, Table 3 of:2008 Edition 5:3)]; --- Changed the screw-holding force requirements of wheat (rice) straw particleboard, from "board surface ≥ 1100N, board edge ≥ 700N" to "board surface ≥ 1100N" ≥900N, board edge ≥600N” (see Table 3 of 5:3, Table 3 of 5:3 of the:2008 edition); --- Increased the formaldehyde emission requirements and testing methods for wheat (rice) straw particleboard (see Table 3 and 6:3:2:9 in 5:3); --- Increase the total volatile organic compound emission (TVOC) requirements and testing methods for wheat (rice) straw particleboard (see 5:3 Table 3 and 6:3:2:10): Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the State Forestry and Grassland Administration: This document is under the jurisdiction of the National Standardization Technical Committee of Forestry Biomass Materials (SAC/TC416): This document is drafted by: Nanjing Forestry University, Wood Industry Research Institute of China Academy of Forestry, Wanhua Hexiang Board Industry Co:, Ltd: Company, Millennium Boat New Material Technology Group Co:, Ltd:, Jinhua Hairi Household Products Co:, Ltd:, Zhaoqing Yaodonghua Decoration Materials Technology Co:, Ltd: Company, Shanghai Kangbai Environmental Protection Equipment Co:, Ltd:, China National Institute of Standardization: The main drafters of this document: Xu Xinwu, Mei Changtong, Zhou Xiaoyan, Pan Mingzhu, Xu Yonglan, Yu Wenji, Yu Wenjie, Jiang Haidong, Yi Honggui, Pu Huangbiao, Qiu Rujie, Lu Tonghua, Zhao Conghua, Zeng Minhua, Wang Bining, Yang Li, Zhang Ran: The previous versions of this document and its superseded documents are as follows: ---First published in:2008 as GB/T 21723-2008; ---This is the first revision: Wheat (rice) straw particle board

1 Scope

This document specifies the classification, requirements, measurement and test methods, results calculation and determination methods, inspection rules, Labeling, packaging, transportation and storage: This document is applicable to wheat (rice) straw particleboard in dry state for interior decoration, furniture making and packaging:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 2828:1-2012 Counting Sampling Inspection Procedures Part 1: Lot-by-Lot Inspection Sampling Retrieved by Acceptance Quality Limit (AQL) plan GB/T 17657-2013 Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels GB/T 18259-2018 Terms for wood-based panels and their surface decoration GB/T 19367-2009 Dimensional determination of wood-based panels GB/T 39600-2021 Classification of formaldehyde emission of wood-based panels and their products LY/T 3230-2020 Classification of volatile organic compounds released by wood-based panels and their products

3 Terms and Definitions

The terms and definitions defined in GB/T 18259-2018 and the following terms and definitions apply to this document: 3:1 Using wheat (rice) straw as raw material and isocyanate resin as adhesive, through crushing, sorting, drying, sizing, molding, pre-pressing, hot-pressing, cooling Sheets made from processes such as cooling, trimming and sanding: 3:2 All the scraps are mixed evenly, and the isocyanate resin adhesive is applied to form a slab, which is formed by hot pressing, and the upper and lower surface layers and the core layer are formed into slabs: Wheat (rice) straw particleboard with uniform crushing material: 3:3 Using wheat (rice) straw as raw material and isocyanate resin as adhesive, it is processed into two fine materials in the thickness direction of the board: A board with a three-layer structure consisting of a skin layer and a coarse material core layer: 3:4 Using wheat (rice) straw as raw material and isocyanate resin as adhesive, it is processed into straw scraps whose size extends from the center layer of the board to the outside: The thickness of the plate changes gradually from coarse to fine, and there is no obvious layer boundary in the thickness direction of the plate: ......

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