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GB/T 8237-2025: Liquid unsaturated polyester resin for fiber reinforced plastics
Status: Valid GB/T 8237: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8237-2025 | English | 369 |
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4 days [Need to translate]
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Liquid unsaturated polyester resin for fiber reinforced plastics
| Valid |
GB/T 8237-2025
|
| GB/T 8237-2005 | English | 209 |
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Liquid unsaturated polyester resin for fiber reinforced plastics
| Valid |
GB/T 8237-2005
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| GB/T 8237-1987 | English | 199 |
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Liquid unsaturated polyester resin for glass fiber reinforced plastics
| Obsolete |
GB/T 8237-1987
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PDF similar to GB/T 8237-2025
Basic data | Standard ID | GB/T 8237-2025 (GB/T8237-2025) | | Description (Translated English) | Liquid unsaturated polyester resin for fiber reinforced plastics | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q23 | | Classification of International Standard | 83.120 | | Word Count Estimation | 18,162 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 8237-2005 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 8237-2025: Liquid unsaturated polyester resin for fiber reinforced plastics---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8237-2025
ICS 83.120
CCSQ23
National Standard of the People's Republic of China
Replaces GB/T 8237-2005
Liquid unsaturated polyester resin for fiber reinforced plastics
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Classification and labeling 2
5.Requirement 2
6 Test Method 4
7 Inspection Rules 6
8 Marking, packaging, transportation and storage 7
Appendix A (Normative) Thixotropic Index Test Method 8
Reference 10
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 8237-2005 "Liquid unsaturated polyester resins for fiber reinforced plastics" and is consistent with GB/T 8237-2005.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The definitions of the terms "liquid unsaturated polyester resin" and "casting" have been changed, and the term "thixotropic index" has been added (see Chapter 3,.2005
Chapter 3 of the.2011 edition);
b) The resin classification was changed from flame retardant resin to flame retardant resin; the general IG type resin was changed to GI type; and the general
GH type resin (see 4.1, Chapter 4 of the.2005 edition);
c) Added marking (see 4.2);
d) Changed the appearance requirements for liquid unsaturated polyester resin (see 5.1, Table 2 of the.2005 edition);
e) Added moisture performance requirements and test methods for resins used in molding processes (see 5.1 and 6.1.2);
f) Added the thixotropic index performance requirements and test methods for thixotropic resins (see 5.1 and Appendix A);
g) Added tensile property requirements and test methods for resin castings and fiber reinforced plastics (see 5.2, 5.3 and 6.2.4, 6.3.3);
h) Modified the bending performance requirements of resin castings and fiber reinforced plastics, and added general GH type resin castings and fiber reinforced plastics.
Performance requirements for strong plastics (see 5.2 and 5.3, Tables 3 and 4 of the.2005 edition);
i) The flame retardant performance requirements for flame retardant resin castings have been changed, and the oxygen index is used to characterize flame retardancy (see Table 3 of 5.2,.2005 edition);
j) Added oxygen index performance requirements and test methods for flame retardant resin fiber reinforced plastics (see 5.3 and 6.3.2);
k) The method for preparing casting specimens has been changed (see 6.2.1, 6.2.1 of the.2005 edition);
l) The provisions on sampling and determination of inspection results have been modified (see 7.2.1.2, 7.2.2.3, Chapter 7 of the.2005 edition);
m) The provisions on the shelf life of resins have been modified (see 8.6, 8.6 of the.2005 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed by China Building Materials Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Fiber Reinforced Plastics (SAC/T 39).
This document was drafted by. Changzhou Tianma Group Co., Ltd. (formerly Building Materials No. 253 Factory), Beijing Glass and Steel Institute Testing Center Co., Ltd., Shanghai
Shanghai Glass Testing Co., Ltd., Nantong Tianhe Resin Co., Ltd., Changzhou Huake Polymer Co., Ltd., Shandong Kaiweier New Materials Co., Ltd.
Company, Zhaoqing Futian Chemical Industry Co., Ltd., Lianyungang Zhongfu Lianzhong Composite Materials Group Co., Ltd., Beijing Fiberglass Research and Design Institute Co., Ltd.
Company, Shandong Non-metallic Materials Research Institute, and Jushi Group Co., Ltd.
The main drafters of this document are. Xuan Weidong, Zhang Haiyan, Zhang Xiaoping, Qin Luping, Feng Siwei, Qian Yongjia, Deng Jinbiao, Xu Guihong, Jiang Hongjuan,
Lü Aifeng, Xu Huaming, Sun Yan, Ye Fenglin, Jin Xiangyu, Chai Xuehong, Wang Qianqian, and Liu Xiaobin.
This document was first issued in 1987, revised for the first time in.2005, and this is the second revision.
Liquid unsaturated polyester resin for fiber reinforced plastics
1 Scope
This document specifies the requirements for liquid unsaturated polyester resins for use in fibre-reinforced plastics and describes the corresponding test methods.
This document applies to the production and
test.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 1446 General principles for test methods for properties of fiber reinforced plastics
GB/T 1447 Test method for tensile properties of fiber reinforced plastics
GB/T 1449 Test method for flexural properties of fiber reinforced plastics
GB/T 1634.2-2019 Plastics - Determination of deflection temperature under load - Part 2.Plastics and hard rubber
GB/T 2406.2 Plastics - Determination of combustion behavior by oxygen index method - Part 2.Room temperature test
GB/T 2567 Test methods for properties of resin castings
GB/T 2577 Test method for resin content of glass fiber reinforced plastics
GB/T 2895 Determination of partial acid value and total acid value of polyester resins
GB/T 3854 Test method for Barcol hardness of reinforced plastics
GB/T 6283 Determination of water content in chemical products - Karl Fischer method (general method)
GB/T 7193 Test methods for unsaturated polyester resins
GB/T 8924 Test method for combustion performance of fiber reinforced plastics - Oxygen index method
GB 15258 Provisions for the Preparation of Chemical Safety Labels
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Unsaturated polyesters produced by polycondensation of polyols and polyacids (or anhydrides) are dissolved in monomers that can undergo cross-linking reactions with them.
Thermosetting resin obtained.
3.2
Thixotropic index
At a certain temperature, the ratio of the viscosity of liquid unsaturated polyester resin at two specific shear rates.
3.3
resincastingbody
A cured resin matrix without any reinforcement.
[Source. GB/T 3961-2009, 3.3.12, modified]
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