BS ISO 10191:2021 pdf download – Passenger car tyres — Verifying tyre capabilities — Laboratory test methods
This document specifies test methods for verifying the capabilities of tyres for passenger cars. Of the test methods presented, it is possible that only some will be required depending on the construction of the tyre (diagonal, bias-belted, radial or T-type construction) to be tested. The tests are carried out in a laboratory under controlled conditions. This document includes endurance tests, a low-pressure performance test, high-speed tests and requirements for bead unseating and tyre strength. The test methods presented in this document are not intended for gradation of tyre performance or quality levels. This document applies to all passenger car tyres.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4223-1:2017, Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres ASTM F414-15, Standard Test Method for Energy Absorbed by a Tire When Deformed by Slow- Moving Plunger
ASTM F2663-15, Standard Test Method for Bead Unseating of Tubeless Passenger and Light Truck Tires
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4223-1:2017 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
breakdown of bond between components in the bead area
[SOURCE: ISO 4223-1:2017, 3.8.1]
parting of rubber compound between belt layers or between belts and plies
[SOURCE: ISO 4223-1:2017, 3.8.2]
4 Test equipment and conditions
4.1 Test drum, cylindrical driven flywheel (drum) having a diameter of 1,7 m ± 1 % or 2,0 m ± 1 %. The surface of the drum shall be smooth steel. For the endurance test and low-pressure performance test according to 7.1, the drum may be coated with a thin layer of non-stick material, e.g. polytetrafluoroethylene (PTFE), to eliminate parasitic tread block chunking (PTBC), provided that the total drum diameter remains within above limits. The width of the test surface and, if applicable, the width of the thin layer of the non-stick material shall be equal to or exceed the overall width of the test tyre. When PTFE lubricant is used as non-stick material, care shall be taken that the composition of the lubricant is suitable for use with rubber compounds. For example, silicone-oil-based lubricants with PTFE content between 40 % and 55 % have shown appropriate performance for this purpose. For the test drum, the loading device shall have a capacity of at least 1 000 kg and the accuracy shall be within ±1 % of the full scale. The speed capability of the equipment shall be adequate for the requirements of the test methods. The accuracy of the test drum speed shall be within 0 2 + km/h.
4.2 Inflation pressure gauges, with a maximum scale value of at least 500 kPa and an accuracy within ±5 kPa.
4.3 Conditioning and test room temperature: If a tyre manufacture desires to increase test severity, tyre conditioning and the tests may be carried out at a higher temperature than specified in the respective subclauses.
5 Testing of tyres with diagonal or bias-belted structure and of T-type temporary-use spare tyres
5.1 Endurance test
5.1.1 Preparation of tyre
22.214.171.124 Mount the tyre on a test rim and inflate it to the pressure specified in Table 1.
126.96.36.199 Maintain the tyre and rim assembly at an ambient temperature of not less than 35 °C for at least 3 h.
5.1.2 Test procedure
188.8.131.52 Readjust the inflation pressure to the value specified in Table 1 immediately before testing.
184.108.40.206 Mount the tyre and rim assembly on a test axle and press the tyre radially against the outer face of the test drum.
220.127.116.11 During the test, the ambient temperature, at a distance of not less than 150 mm and not more than 1,0 m from the tyre, shall be at least 35 °C. No provision shall be made for cooling the tyre during the test.BS ISO 10191 pdf download.