1.1 This practice covers specific variations in test conditions which shall be applicable when Practice G23 is employed for the exposure of plastics. Also covered are the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. 1.2 This standard does not purport to address all of the safety problems, 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. Note 1-This practice and ISO/DIS4892 are related in title and in technical content. However, the user should note that there may be significant technical differences. ISO/DIS4892 permits the use of different instruments and different procedures among users.