GB/T 47099-2026Rubber flaps for tyres - Requirements and test methods (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 modifies and adopts ISO 21634.2022 Rubber Flaps for Tyres - Requirements

and Test Methods.

In comparison with ISO 21634.2022, there are many structural adjustments. A summary table

of the structural number changes between the two documents is provided in Appendix A.

In comparison with ISO 21634.2022, this document has many technical differences, which are

indicated by a vertical single line (|) in the margin of the involved clauses. A summary table of

these technical differences and their causes is provided in Appendix B.

This document makes the following editorial modification.

---Some specifications and dimensions are added to Appendix C (informative) "Main

Dimensions of Finished Tyre Flaps".

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 19 on Tyres and

Rims of Standardization Administration of China (SAC/TC 19).

The drafting organizations of this document. SAILUN Group Co., Ltd.; Zhongce Rubber Group

Co., Ltd.; Xiamen Cheng Shin Tire & Rubber Industry Co., Ltd.; Triangle Group Co., Ltd.;

Beijing Research & Design Institute of Rubber Industry Co., Ltd.; Shandong Linglong Tire Co.,

Ltd.; Guizhou Tyre Co., Ltd.; Double Coin Tire Group Co., Ltd.; Hefei Wanli Tire Co., Ltd.;

Anhui GITI Passenger Radial Tire Co., Ltd.; Qingdao TechKing Tyre Co., Ltd.; Shaanxi

Yanchang Petroleum Group Rubber Co., Ltd.; Qingdao Ailite Rubber Co., Ltd.; Jining Qilu

Testing Technology Co., Ltd.; Jiaozuo City Product Quality Inspection and Testing Center;

Shanghai Balance Automotive Testing Equipment Co., Ltd.

1 Scope

This document specifies the requirements and test methods for rubber flaps used for tube tyres

of motor vehicles. These rubber flaps can protect the inner tube from damage by the rim or tyre.

This document applies to flaps used for truck and bus tyres, earth-mover tyres and industrial

pneumatic tyres.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document

through the normative references in the text. In terms of dated references, only the version with

the specified date applies to this document. In terms of references without a specified date, the

latest version (including all the modifications) is applicable to this document.

GB/T 521 Test Methods for Measuring Peripheral Dimensions of Tyres

GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-strain

Properties (GB/T 528-2009, ISO 37.2005, IDT)

GB/T 531.1 Rubber, Vulcanized or Thermoplastic - Determination of Indentation Hardness -

Part 1.Durometer Method (Shore hardness) (GB/T 531.1-2008, ISO 7619-1.2004, IDT)

GB/T 2941 Rubber - General Procedures for Preparing and Conditioning Test Pieces for

Physical Test Methods (GB/T 2941-2025, ISO 23529.2016, IDT)

GB/T 3512 Rubber, Vulcanized or Thermoplastic - Accelerated Ageing and Heat Resistance

Tests - Air-oven Method (GB/T 3512-2014, ISO 188.2011, IDT)

GB/T 6326 Tyre - Vocabulary

3 Terms and Definitions

The terms and definitions defined in GB/T 6326 are applicable to this document.

4 Specification Marking Method

5 Requirements

6 Test Methods

2 °C for 24 hours.