GB/T 519-2017Test methods for measuring physical properties of pneumatic tyres (English PDF)

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 519-2008 "Test methods for measuring physical properties of pneumatic tyres". Compared with GB/T 519-2008, the main technical changes are as follows.

- MODIFY the normative references (see Clause 2 of this Standard, Clause 2 of 2008 edition);

- MODIFY the terms and definitions, DELETE GB/T 6039 (see Clause 3 of this Standard, Clause 3 of 2008 edition);

- ADD the selection of sample preparation tools (see 4.1);

- DELETE the sliding abrasion test (see 2008 version 5.1.3.2);

- ADD the DIN abrasion test (see 5.1.3.2);

- MODIFY the length of the sample, from about 150 mm ~ 250mm to not less than 150 mm (see 5.2.1.1.1 of this Standard, 5.2.1.1 of 2008 edition);

- ADD the adhesive strength between cord plies after aging (see 5.2.2.6);

- MODIFY "it shall cut a length of tyre of about 60 mm" TO "it shall cut a length of tyre of more than 200 mm" [see 5.3.3.1.2 d) of this Standard, 5.3.3.1.3 b) of 2008 edition];

- MODIFY the dimension of the hardness sample (see 7.6 and 8.2 of this Standard, 7.6 and 8.2 of 2008 edition).

1 Scope

This Standard specifies the terms and definitions, sample preparation, test for physical properties of covers, penetration analysis determination method for inside liners of tyres, test for physical properties of inner tubes and test for physical properties of flaps for test methods for measuring physical properties of pneumatic tyres (covers, inner tubes and flaps)

This Standard applies to passenger car tyres, truck tyres, agricultural tyres, earth-mover tyres and industrial pneumatic tyres.

This Standard does not apply to aircraft tyres, motorcycle tyres and cycle tyres.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the dated edition cited applies. For undated references, the latest edition of the referenced document (including all amendments) applies.

GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties

GB/T 529 Rubber, vulcanized or thermoplastic - Determination of tear strength (Trouser, angle and crescent test pieces)

GB/T 531.1 Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)

GB/T 531.2 Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 2: IRHD pocket meter method

GB/T 532 Rubber, vulcanized or thermoplastic - Determination of adhesion to textile fabric

GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method

GB/T 1689 Rubber vulcanized - Determination of abrasion resistance (Akron machine)

GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces for physical test methods

GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests

GB/T 6326 Tyre terms and definitions

GB/T 9867 Rubber, vulcanized or thermoplastic - Determination of abrasion resistance using a rotating cylindrical drum device

GB/T 11181 Steel cord for radial tyre

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 6326 apply.

4 Sample preparation

4.1 Sample preparation tools are selected according to GB/T 2941, it may also use other sample preparation tools that meet the requirements for test sample preparation.

4.2 The finished product after vulcanization shall be conditioned indoors before sampling. The conditioning time of covers is not less than 24 h; the conditioning time of inner tubes and flaps is not less than 12 h.

4.3 If the sample taken from the finished product is not smooth in surface or is thicker than the corresponding standard provisions, it shall be cut and grinded according to GB/T 2941. When the thickness of the sample is less than the corresponding standard provisions, the sample can be cut according to the actual thickness of the sample.

5 Test for physical properties of covers

5.2.2.1.2 CUT a peeling hole of 20 mm ~ 50 mm between the peeling ply at one end of the sample described in 5.2.1.1. To prevent mistaking cords and plies, cut a side hole of uniform depth on both sides of the sample's peeling ply. For diagonal tyres, the depth of the sample's cutting hole is 2.5 mm, and for radial tyres, the depth of the sample's cutting hole is 3.5 mm, so as to ensure that the effective peeling width of the sample is 25 mm ± 0.5 mm. Do not cut off the cord when cutting the rubber strips on both sides of the sample.

5.2.2.1.3 DETERMINE the adhesive strength of the above samples according to GB/T 532. The peeling order is from the inner ply to the outer ply, and the inter-ply adhesive shall be attached to the bottom of the peeling ply. There shall be no mistaking cords or connectors, otherwise the peel value is not included in the results.

5.2.2.2 Adhesive strength between tread rubber and breaker of diagonal tyres, between tread rubber and belt of radial tyres or between tread rubber and cap ply of radial tyres The sample is the same as 5.2.1.1. When clamping the sample, the rubber ply shall be clamped on the holder. The steps are the same as 5.2.2.1.

5.2.2.4 Adhesive strength between carcass cord ply and beaker cord ply, and between beaker cord ply and beaker cord ply of diagonal tyres See 5.2.1.1 for the sample. TAKE 2 or 3 plies of cords as a set. The test procedure is the same as 5.2.2.1.

5.2.2.5 Adhesive strength between carcass cord ply and belt, between belt and belt, between belt and cap ply, and between cap ply and cap ply of radial tyres See 5.2.1.1 for the sample. TAKE 2 piles as a set. The carcass cord ply shall be clamped on the holder during the test, the rest of the test procedure is the same as 5.2.2.1.