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GB/T 31547-2015 English PDF (GBT31547-2015)

GB/T 31547-2015 English PDF (GBT31547-2015)

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GB/T 31547-2015: Electric bicycle inner tubes

This Standard specifies the types, requirements, test methods and signs of electric bicycle inner tubes. This Standard is applicable to model vulcanized inner tubes assembled with electric bicycle tyres.
GB/T 31547-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.160.10
G 41
Electric Bicycle Inner Tubes
ISSUED ON: MAY 15, 2015
IMPLEMENTED ON: FEBRUARY 1, 2016
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Types ... 4
4 Requirements ... 4
5 Test Methods ... 5
6 Signs ... 7
Electric Bicycle Inner Tubes
1 Scope
This Standard specifies the types, requirements, test methods and signs of electric bicycle inner tubes.
This Standard is applicable to model vulcanized inner tubes assembled with electric bicycle tyres.
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable 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 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-strain Properties
GB 1796.1 Tyre Valves - Part 1: Clamp-in Valves
GB 1796.2 Tyre Valves - Part 2: Rubber Base Valves
GB/T 31546 Electric Bicycle Tyres
GB/T 31548 Series of Electric Bicycle Tyres
GB/T 31549 Performance Testing Method for Electric Bicycle Tyres
3 Types
The inner tubes are divided into two types in accordance with the materials used for the manufacturing:
---Inner tubes made of natural rubber and mainly natural rubber are Type A; ---Inner tubes made of butyl rubber and mainly butyl rubber are Type B. 4 Requirements
4.1 Specifications and Sizes
The specifications and sizes of inner tubes shall comply with the matching requirements for as a qualified product.
5.1.3 If there is an obvious air leakage, re-inflate it in accordance with the same conditions mentioned above and immerse it in the water for 1 min. If there are more than one bubbles emerging, it shall be deemed as disqualified. However, the valve part is allowed to be re-tested in accordance with the above-mentioned method after the repair.
5.2 Tensile Test
The tensile test shall be carried out in accordance with the stipulations of GB/T 528. When adopting Type 1 cutting knife to determine the elongation, in the center, base center, upper model center and lower model center of the same segment of the inner tube non-connector, along the peripheral direction of the tyre body, respectively take 1 specimen (as shown in Figure 1). Adopt the method of removing the maximum and minimum value for the test results, and calculate in accordance with Formula (1):

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