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

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GB/T 31547-2015: Electric bicycle inner tubes
GB/T 31547-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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’s Republic of China;
Standardization Administration of the People’s 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):