GB/T 7036.2-2017Inner tube of pneumatic tyres—Part 2:Inner tube of motorcycle tyres (English PDF)

Foreword

GB/T 7036 Inner Tube of Pneumatic Tyres consists of the following two parts.

--- Part 1: Inner Tube of Motor Vehicle Tyres;

--- Part 2: Inner Tube of Motorcycle Tyres. This Part belongs to Part 2 of GB/T 7036.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 7036.2-2007 Inner Tube of Pneumatic Tyres - Part 2: Inner Tube of Motorcycle Tyres. Compared with GB/T 7036.2-2007, this Part has the major technical changes as follows.

--- Add "the size of the inner tube shall meet the matching requirements of the used tyre. When the same inner tube can be applied to different tyres, the specifications of the tyres that can be matched shall be represented on the inner tube" (see 4.1 of this Edition);

--- Modify and confirm the size of the rubber base for the small rubber base valve (see Table 1 of this Edition; Table 1 of Edition 2007);

--- Modify the expression of the aeration measurement position in the air tightness test method (see 5.1.1 of this Edition; 5.1.1 of Edition 2007);

--- Modify "... and immerse into water for 1min; if there is more than 1 bubble..." into "... and immerse into water for 1min; if there are 1 or more bubbles..." (see 5.1.3 of this Edition; 5.1.3 of Edition 2007);

--- Modify "rubber base for rubber base valve and tyre body..." into "rubber base valve and tyre body..." (see Table 1 and 5.5 in this Edition; Table 1 and 5.5 of Edition 2007);

--- Add the methods for the values of tensile strength and elongation (see 5.2 of this Edition);

--- Modify "cut a 20mm~30mm-sized mouth at the joint BETWEEN the rubber base AND the rubber of tyre body OF the sample..." into "cut a 10mm~15mm-sized mouth at the joint BETWEEN the rubber base AND the rubber of tyre body OF the sample..."; add a sampling diagram of the bond strength test between the rubber base valve and the tyre body (see 5.5.1 of this Edition; 5.5.1 of Edition

2007);

--- Add the sampling and inspection rules (see Clause 6 of this Edition);

--- Modify the width of the Type-B inner tube color line from 2mm to 1mm; add "7.3 Type-A inner tube shall not mark the color line used for the Type-B inner tube specified in 7.2" (see 7.2 and 7.3 of this Edition; 6.2 of Edition 2007).

1 Scope

This Part of GB/T 7036 specifies the types, requirements, test methods, sampling inspection rules and marks for the inner tube of motorcycle tyres.

This Part is also applicable to the inner tubes of new motorcycle tyres.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

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

GB/T 532 Rubber, Vulcanized or Thermoplastic - Determination of Adhesion to Textile Fabric

GB/T 1796.2 Tyre Valves - Part 2: Rubber Base Valves

3 Type of Inner Tube

According to the materials used in the manufacture of the inner tube, it can be divided into two types. Type-A inner tube made of natural rubber and natural rubber blend,

4 Requirements

5 Test Method

5.5 The bond strength and bond force between rubber base valve and tyre body

5.6 Absolute value of the tensile strength change rate after aging of the Type-A inner tube Test conditions. aging temperature is at 90°C±1°C; aging time is 24h.

6 Sampling and Inspection Rules

7 Marking

7.1 Each inner tube shall have the following marks; thereof, a) ~ c) are permanent marks; d) is the impressions that can't be washed off. […]