This standard establishes a test method to measure the effect on elastomeric materials subjected to rapid depressurization from elevated pressures in dry CO2 environments. It is designed for testing O-rings or other specimens of elastomeric vulcanizates. This test method is not applicable to the testing of cellular rubber or porous materials.

This standard recommends procedures for the preparation of test specimens, the test equipment to be used, the test procedures to be followed, and the reporting of test results. The results are determined by monitoring changes in physical and mechanical properties as well as changes in appearance after exposure to the selected test media.

In view of the wide range of service conditions, this test method is intended only to be a means of initial material evaluation and comparison. No attempt or implication is made to establish any pass/fail criteria for material tested by this method. The change in properties of an elastomeric material is indicative of its resistance to a specific environment. This test method can be regarded only as a relative measure of the resistance of a material under the conditions of this particular test, and does not necessarily have any direct relation to service performance. The precision of this test method and reproducibility within and among laboratories has not been established. The significance of the results can be determined only by each laboratory for its particular application. The user of this test method is encouraged to establish statistical significance of the data resulting from this method.

SAFETY PRECAUTIONS: This test involves the use of high-pressure CO2. The appropriate safety precautions for working with high-pressure gases should be observed. One source of safety information is CGA(Footnote 2) P-1.2.

Footnote 2 - Compressed Gas Association (CGA), 1235 Jeff Davis Highway, Arlington, VA 22202.

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