GB/T 3672.2-2025 English PDF

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GB/T 3672.2-2025: Tolerances for rubber products - Part 2: Geometrical tolerances
Status: Valid

GB/T 3672.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 3672.2-2025	284	Add to Cart	3 days	Tolerances for rubber products - Part 2: Geometrical tolerances	Valid
GB/T 3672.2-2002	204	Add to Cart	3 days	Rubber -- Tolerances of products -- Part 2: Geometrical tolerances	Valid

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GB/T 13871.1   GB/T 10708.3   GB/T 5721   GB/T 29992   GB/T 3672.1   GB/T 5720   

Basic data

Standard ID: GB/T 3672.2-2025 (GB/T3672.2-2025)
Description (Translated English): Tolerances for rubber products - Part 2: Geometrical tolerances
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G43
Classification of International Standard: 83.140.01
Word Count Estimation: 14,166
Date of Issue: 2025-08-01
Date of Implementation: 2026-02-01
Older Standard (superseded by this standard): GB/T 3672.2-2002
Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China

GB/T 3672.2-2025: Tolerances for rubber products - Part 2: Geometrical tolerances

---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/GBT3672.2-2025
ICS 83.140.01 CCSG43 National Standard of the People's Republic of China Replaces GB/T 3672.2-2002 Tolerances for rubber products - Part 2.Geometrical tolerances Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

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 is Part 2 of GB/T 3672 “Tolerances for Rubber Products”. GB/T 3672 has been published in the following parts. --- Part 1.Dimensional tolerances; --- Part 2.Geometric tolerances. This document replaces GB/T 3672.2-2002 "Tolerances for rubber products - Part 2.Geometrical tolerances" and GB/T 3672.2-2002 In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Changed the dimension symbols in the coaxiality tolerance example diagram and tolerance table of molded products, and changed the nominal size "greater than 0mm, less than For the coaxiality tolerance within the range of 16 mm, the tC value of the P grade was changed from 0.15 mm to 0.2 mm (see Figure 5 and Table 5,.2002 Figure 5 and Table 5 of the same edition); b) The requirements for measuring instruments have been changed, and the normative references to GB/T 5723-1993 and GB/T 6031-1998 (see 5.2.1, 4.2.1 of the.2002 edition). This document is equivalent to ISO 3302-2.2022 "Tolerances for rubber products — Part 2.Geometrical tolerances". The following minimal editorial changes have been made to this document. --- Change the name of this document to "Tolerances for rubber products - Part 2.Geometrical tolerances" to coordinate with the existing document; --- Added table notes (see Table 1, Table 2 and Table 3). 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 was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee on Rubber and Rubber Products of Standardization (SAC/TC35). This document was drafted by. Northwest Rubber and Plastics Research and Design Institute Co., Ltd., Anhui Zhongding Sealing Co., Ltd., Guangzhou Machinery Science and Technology Co., Ltd. Co., Ltd., Chengdu Shengbang Sealing Co., Ltd., Qingdao Hailiwei New Materials Technology Co., Ltd., Jiangsu Guanlian New Materials Co., Ltd. Materials Technology Co., Ltd., Ningbo Xinhai Aido Automobile Wiper Manufacturing Co., Ltd., Harbin Saishang Sealing Technology Co., Ltd., Guangdong Electric Power Science Research Institute of Co., Ltd., Tieling Rubber Industry Research and Design Institute of Liaoning Province, Xianyang Hailong Sealing Composite Materials Co., Ltd., Guangdong Tiancheng Sealing Co., Ltd. and Hebei Huageng Technology Co., Ltd. The main drafters of this document are. Wu Chunlei, Shu Benqin, Ke Yuchao, Chi Xiaoning, Fan Chen, Hu Yating, Zhan Wei, You Yongbiao, Tian Weibo, Fu Qiang, Qian Aidong, Zhu Haifeng, He Hong, Li Yang, Chen Xiaofeng, Lin Qing, Yao Kunjing, Su Huaisheng, Tian Bo, Zhang Li, Meng Jian, Zhu Lifu, Sun Shaojia, and Zhang Fang. This document was first published in.2002 and this is the first revision.

introduction

Rubber products are prone to dimensional changes after vulcanization and processing. This may be due to various factors such as mold shrinkage or extrusion expansion relaxation. Caused by factors. These variations are usually determined and taken into account when designing components such as molds and dies used to manufacture a product. The higher tolerance levels listed in this document should only be used when required by the end application and are limited to those areas considered critical. The greater the precision employed, the tighter the control required in the manufacturing process, and thus the higher the cost. When a product requires special properties, using a compound that can be molded to close tolerances may not always provide these properties. In this case, it is usually negotiated by the relevant parties. Generally speaking, low hardness vulcanized rubber (i.e. hardness less than 50IRHD) Vulcanized rubber, see ISO 48-2) requires wider tolerances than vulcanized rubber of higher hardness. GB/T 3672 "Tolerances for Rubber Products" specifies the tolerances for rubber products and consists of two parts. --- Part 1.Dimensional tolerances. Purpose. to be used for dimensional design and acceptance of rubber products. --- Part 2.Geometrical tolerances. Purpose. to be used for geometrical dimension design and acceptance of rubber products. Tolerances for rubber products - Part 2.Geometrical tolerances

1 Scope

This document specifies the following geometrical tolerances for molded and extruded solid rubber products, including those with metal skeletons. ---Flatness tolerance; ---Parallelism tolerance; --- Perpendicularity tolerance; ---Coaxiality tolerance; ---Position tolerance. The tolerances specified in this document apply primarily to vulcanized rubber products, but may also apply to thermoplastic rubber products.

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. ISO 1101.2017 Geometrical Product Specifications (GPS) Geometrical Tolerances - Form, Orientation, Position and Runout Tolerances [Geomet- locationandrun-out] Note. GB/T 1182-2018 Geometrical Product Specifications (GPS) Geometric Tolerances - Shape, Orientation, Position and Runout Tolerances (ISO 1101. 2017, MOD) Note. GB/T 2941-2025 Rubber physical test methods - General procedures for specimen preparation and conditioning (ISO 23529.2016, IDT)

3 Terms and Definitions

There are no terms or definitions that require definition in this document.

4 Tolerance Classification

This document specifies the following three tolerance levels. ---P precision grade; ---M medium level; ---N Not strict level. The required tolerance grade depends on the application requirements. M and P grades require more machining operations and a certain degree of finishing, such as Grinding. Not all cross-sectional tolerances of molded products and extruded products of any structure can be represented graphically. Therefore, the tolerances shown in Figures 1 to 6 are not necessarily the same as those in Figures 1 to 6. The difference should be regarded as an example. ......

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