GB/T 31547-2023Electric bicycle inner tubes (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This document serves as a replacement of GB/T 31547-2015 Electric Bicycle Inner Tubes. In comparison with GB/T 31547-2015, apart from structural adjustments and editorial modifications, the main technical changes are as follows:

a) The special description of the bonding strength index between the rubber base valve and the tyre body is modified (see Table 1; Table 1 and 5.4 of Version 2015);

b) The test conditions for the air tightness test are modified (see 6.1.1; 5.1.1 of Version

2015);

c) The type of tensile test cutter is modified (see 6.2; 5.2 of Version 2015);

d) The type of joint tensile strength test cutter is modified (see 6.3; 5.3 of Version 2015).

Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents.

This document was proposed by China Petroleum and Chemical Industry Federation.

This document shall be under the jurisdiction of National Technical Committee on Tyres and Rims of Standardization Administration of China (SAC/TC 19).

The drafting organizations of this document: Tianjin WANDA Tyre Group Co., Ltd.;

Guangzhou Rubber Industrial Products Research Institute Co., Ltd.; Bengbu Yinuohua Tyre Co., Ltd.; Guangzhou Feixuan Rubber Co., Ltd.; Xiamen Zhengxin Industrial Co., Ltd.; New Dongyue Group Co., Ltd.; Tengzhou Saiyang Rubber Industry Co., Ltd.; Hebei Xiemei Rubber Products Co., Ltd.; Sichuan Yuanxing Rubber Co., Ltd.; Jinhua Ruidi Vehicle Industry Co., Ltd.

The main drafters of this document: Chen Qingsong, Yu Zhenjiang, Zhu Hongsuo, Ni Qianxiang, Huang Yaopeng, Li Ruihua, Xuan Zhaomin, Nie Sanjun, Yang Xueyun, Zhang Guangfu, Chen Genhua.

This document was firstly issued in 2015. This is the first revision. Electric Bicycle Inner Tubes

1 Scope

This document specifies the types and requirements of electric bicycle inner tubes, describes the corresponding test methods, and specifies the content of marks.

This document is applicable to model vulcanized inner tubes for the assembly of electric bicycle tyres.

2 Normative References

GB/T 528

GB/T 1796.1

GB/T 1796.2

GB/T 31546

GB/T 31548

GB/T 31549

3 Terms and Definitions

This document does not have terms or definitions that need to be defined.

4 Types

In accordance with the materials used in manufacture, inner tubes are classified into two types:

— Natural rubber inner tubes and inner tubes based on natural rubber are Type A;

— Butyl rubber inner tubes and inner tubes based on butyl rubber are Type B.

6 Test Methods