GB/T 20671.1-2020 in English

VALID

Classification system and test methods for nonmetallic gasket materials—Part 1：Standard classification system for nonmetallic gasket materials

Issued on:2020-06-02
Implemented on:2020-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $210.00
$204.00

Standard No:	GB/T 20671.1-2020
Document status:	VALID
Title in English:	Classification system and test methods for nonmetallic gasket materials—Part 1：Standard classification system for nonmetallic gasket materials
Title in Chinese:	非金属垫片材料分类体系及试验方法第1部分:非金属垫片材料分类体系
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-06-02
Implemented on:	2020-07-01
Superseding:	GB/T 20671.1-2006 Classification system and test methods for nonmetallic gasket materials - Part 1: Standard classification system for nonmetallic gasket materials
ICS Classification:	23.100.60-Filters, seals and contamination of fluids
Professional Classification:	GB-National Standard
Related Keywords:	classification system nonmetallic gasket materials nonmetallic gasket materials introduction standard revision background core classification system code position characterization characteristics example description classification method
Related Topics:	Standards for Non-Metallic Materials Gasket non-metallic material Composition analysis of metal materials belongs to Gasket standard Metal gasket mat english Organic Non-metallic Materials Laboratory Inorganic non-metallic materials experiment mat english Flatness of non-metallic materials Classification of organic non-metallic materials liquid material Analysis method of metal material composition Classification of metal materials Analyzing Metal Material Composition Metal classification detection exudate material method Material classification Nine non-metallic materials Application of non-metallic materials Non-metallic Materials Laboratory Tensile test method for non-metallic materials Metal Detection Classification Material classification Types of metallic material phases Trade names of non-metallic materials Gasket test metal material iso classification Non-metallic material testing equipment Class I heavy metals About non-metallic materials non-magnetic metal material Three items of non-metallic materials Classification basis of metal materials metal fragment super strong non-metallic material Chip metal material Non-metallic gasket Metal gasket GB/T 20671.1 GB/T 20671.1-2006 GB/T 20671.1-2020 metal pad Types of gaskets Gasket type Main material system Heavy metal raw material standard system American standard non-metallic gasket Non-metallic gaskets abroad nonmetal National standard for non-metallic flat gaskets Non-metallic material performance testing Design of non-metallic material parts Non-metallic gasket standards

《GB/T 20671.1-2020非金属垫片材料分类体系及试验方法第1部分:非金属垫片材料分类体系》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Introduction

Standard Revision Background and Technical Evolution

GB/T 20671.1-2020 replaces the 2006 version of the standard. The main technical changes include: Classification basis changed to separation of classification method and code definition, M code tensile strength value rounding adjustment, new G/S coding system, etc. This standard was proposed by China Building Materials Federation and is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Mineral Products and Products.

Analysis of the core classification system

Code position	Characterization characteristics	Example description
1st position	Reinforcement material category	1-Asbestos/7-Non-asbestos fiber
2nd position	Manufacturing method	2-Pulping and papering process
3rd-6th position	Physical performance parameters	Compression rate/oil resistance, etc.

Typical coding example: GB/T 20671(F725400-B5E66M4) means:
Non-asbestos fiber (7) + pulping process (2) + compression rate 20-30% (5) + IRM903 oil thickening rate 15-30% (4), supplementary properties include creep relaxation rate ≤30% (B5), fuel oil tolerance (E66), tensile strength ≥6.0MPa (M4)

Comparison of key technical changes

Changed items	2006 version	2020 version
Classification structure	Single "classification basis"	Split into "classification method" + "code definition"
Coding system	No G/S coding	Add flexible graphite (G) and special characteristics (S) coding
Tensile strength	Retain decimal places	Round to integer

Implementation and application suggestions

Material selection: Type 7 non-asbestos fiber materials are preferred to replace asbestos products
Coding application: Supplementary characteristic codes need to be combined with working conditions requirements (such as B5 creep index is suitable for high temperature conditions)
Testing Notes: The thickness measurement shall be carried out according to the corresponding pressure specified in Table 5 (e.g. Type 1 material requires 80.3±6.9kPa)

Application Case: A chemical plant pipeline seal uses F725400-B5 coded material. Under 100℃/2.5MPa working conditions, the 24h stress loss is reduced from the original 35% to 28%, and the sealing life is increased by 40%

More samples: QC/T 942-2021 NB/T 47013.2-2015 JC/T 2453-2018

Sample only — not a preview of GB/T 20671.1-2020

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