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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 3672.1-2025: Tolerances for rubber products - Part 1: Dimensional tolerances Status: Valid GB/T 3672.1: Historical versions
Basic dataStandard ID: GB/T 3672.1-2025 (GB/T3672.1-2025)Description (Translated English): Tolerances for rubber products - Part 1: Dimensional tolerances Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G43 Classification of International Standard: 83.140.01 Word Count Estimation: 14,116 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 3672.1-2002 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 3672.1-2025: Tolerances for rubber products - Part 1: Dimensional 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/GBT3672.1-2025ICS 83.140.01 CCSG43 National Standard of the People's Republic of China Replaces GB/T 3672.1-2002 Tolerances for rubber products - Part 1.Dimensional tolerances Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued PrefaceThis 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 is required. This document is Part 1 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 3672.1-2002 "Tolerances for rubber products - Part 1.Dimensional tolerances" and is in compliance with GB/T 3672.1-2002. In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Added the following information to the general provisions for molded products. when rubber products are deformed during demoulding, the dimensions of the products need to take into account special allowances [see 6.1e)]; b) Added flash and flash classification (see 6.5); c) Added tolerances for nominal cross-sectional dimensions of unsupported extruded products exceeding 100 mm (see 7.3.2); d) Changed the dimensional tolerance of SW1 grade for calendered rubber sheets with a width of 1600mm or more from ±3% to ±2% (see Table 10,.2002 9 of the.2002 edition). This document is equivalent to ISO 3302-1.2014 "Tolerances for rubber products — Part 1.Dimensional tolerances". A new chapter “Terms and Definitions” has been added to this document. The following minimal editorial changes have been made to this document. --- Change the name of this document to "Tolerances for rubber products - Part 1.Dimensional tolerances" to coordinate with the existing document; --- Added the table notes with “%” tolerance (see Table 1, Table 3 to Table 5, Table 7, Table 9, Table 10). 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. Research Institute Co., Ltd., Pingdingshan Kuangyi Hose Products Co., Ltd., Qingdao Hailiwei New Materials Technology Co., Ltd., Ma'an Shan Hongli Rubber Products Co., Ltd., Jiangsu Mingzhu Testing Machinery Co., Ltd., Jiangsu Guanlian New Materials Technology Co., Ltd., Ningbo Xinhai Aido Automobile Wiper Manufacturing Co., Ltd., Harbin Dongan Industrial Development Co., Ltd., Guangdong Power Grid Co., Ltd. Electric Power Research Institute, Liaoning Tieling Rubber Industry Research and Design Institute, Xianyang Hailong Sealing Composite Materials Co., Ltd., Guangdong Tiancheng Sealing Co., Ltd., Huo Fenhe Diversified Operation Co., Ltd. of Zhou Coal and Electricity Group, Beijing Chengnan Rubber and Plastic Technology Research Institute, Hebei Huageng Technology Co., Ltd., Xingtai Rubber Factory, Jiangsu Runtai Silver Technology Co., Ltd., Hebei Huami New Materials Technology Co., Ltd., Yancheng City Quality and Technical Supervision Comprehensive Inspection and Testing Center, Guangzhou Xinqiang Auto Parts Co., Ltd., Chongqing Hengweilin Auto Parts Co., Ltd., Qingdao Ruichen Sealing Technology Co., Ltd., Ning Bochengde Plastic Technology Co., Ltd. and Dongguan Xindong Rubber and Plastic Hardware Products Co., Ltd. The main drafters of this document are. Xu Xiaohui, Shu Benqin, Ke Yuchao, Chen Jinchao, Wang Peng, Hu Yating, Huang Lianggen, Bao Dafei, Zhan Wei, You Yongbiao, Jiang Wei, Zhang Li, Qian Aidong, Zhu Haifeng, Wu Kaibin, Wang Fei, Huang Hao, Li Yang, Jin Jianguo, Shi Yimang, Zhou Dan, Wang Dongdong, Su Chengyu, Yan Zelin, Chen Shehui, Li Jie, Zeng Xianglin, Chen Xiaofeng, Sun Lu, Wen Yu, Liu Mingbao, Su Huaisheng, Li Changjiang, Fu Qiang, Shi Yanling, Zhu Lifu, Wang Mukang, Xie Aidi, Liu Wei, Zhang Fang, Liu Yuke, Yang Congbing, Jia Zhiguo, Tang Yong, Xu Jinjin, and Song Qun. The previous versions of this document and the documents it replaces are as follows. --- First published as GB/T 3672-1983 in 1983, first revised in.1992; --- Revised for the second time in.2002 to GB/T 3672.1-2002; ---This is the third revision.introductionRubber 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 1.Dimensional tolerances1 ScopeThis document specifies the tolerance classes and values for the dimensions of molded, extruded, and calendered solid rubber products. It also describes the procedures for determining compliance with this document. The corresponding measurement methods required for the parts. The tolerances specified in this document apply primarily to vulcanized rubber products, but may also apply to thermoplastic rubber products. This document does not apply to calendered composite products such as precision annular seals or tapes, or rubber coated with glue or adhesive. products.2 Normative referencesThe 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. Note. GB/T 321-2005 Priority numbers and priority number systems (ISO 3.1973, IDT) ISO 48-2 Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2.Hardness between 10 IRHD and 100 IRHD IRHD and 100IRHD) NOTE 1 There is no technical difference between the referenced content in ISO 48-2 and the referenced content in ISO 48. Note 2.GB/T 6031-2017 Vulcanized rubber or thermoplastic rubber — Determination of hardness (10 IRHD to 100 IRHD) (ISO 48-2.2010, IDT) Note. GB/T 20739-2006 Rubber Products Storage Guide (ISO 2230.2002, IDT) Note. GB/T 2941-2025 Rubber physical test methods - General procedures for specimen preparation and conditioning (ISO 23529.2016, IDT)3 Terms and DefinitionsThere are no terms or definitions that require definition in this document. 4.Measurement of dimensions 4.1 General For solid products, the dimensional measurements should be carried out 16 hours after vulcanization. In case of dispute, this minimum time may be extended to 72h. The buyer's measurement shall be completed within three months after the date of shipment or before the finished product is put into use (the former shall be the measurement time). (time), the measurement should be carried out at the standard temperature after adjustment in accordance with ISO 23529.Care should be taken to ensure that the product is not subjected to the undesirable conditions specified in ISO 2230. Favorable storage conditions and ensure that the product does not deform during the measurement process. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 3672.1-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 3672.1-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 3672.1-2025_English with my colleagues?Answer: Yes. 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