1.1 This practice covers specific variations in the test conditions and procedures that shall be applicable when Practice G151 plus either Practice G152 , G153 , G154 , or G155 are employed for exposure of vulcanized rubber compounds. It also covers the preparation of test specimens and the evaluation of results. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.