BS ISO 4662:2017 pdf download – Rubber, vulcanized or thermoplastic — Determination of rebound resilience 5.2.2 Dimensions The standard test piece is a disc with a thickness of (12,5 ± 0,5) mm and a diameter of (29 ± 0,5) mm. Other test pieces having non-standard dimensions may be used for comparative measurements with special provisions (see Annex A). 5.2.3 Measurement of dimensions Check that the test pieces meet the requirements in 5.2.2, using the appropriate method of measurement described in ISO 23529. 5.2.4 Number of test pieces For each material, two test pieces shall be tested. 5.2.5 Time-interval between forming and testing Samples and test pieces shall be protected from light and heat as much as possible during the interval between forming (vulcanization or moulding) and testing. For normal test purposes, the minimum time between forming and testing shall be 16 h. In cases of arbitration, the minimum time shall be 72 h. For non-product tests, the maximum time between forming and testing shall be four weeks and, for evaluations intended to be comparable, the tests shall, as far as possible, be carried out after the same time interval. For product tests, whenever possible, the time between forming and testing shall not exceed three months. In other cases, tests shall be made within two months of the date of receipt of the product by the purchaser (see ISO 23529). If the preparation of the test piece involves buffing, the interval between buffing and testing shall be not less than 3 h and not greater than 72 h. 5.2.6 Conditioning Prepared test pieces shall be conditioned immediately before testing for a minimum period of 3 h at one of the standard laboratory temperatures specified in ISO 23529. The same temperature shall be used throughout any one test or series of tests intended to be comparable. 5.3 Temperature of test The temperature or temperature range of the test shall be chosen according to the material being tested and the information required. Preference shall be given to the temperatures listed in ISO 23529. The tolerance limits on the temperature shall be not more than ±1 °C. When no temperature is specified, a standard laboratory temperature shall be chosen. Where the resilience changes quickly with temperature, the use of more temperatures at closer intervals is recommended. 5.4 Procedure 5.4.1 Thermal conditioning and mounting of test piece If stickiness is noted on the impacted surface,...
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