1.1 This test method covers determination under laboratory conditions of the degree and rate of aerobic biodegradation of plastic materials, including formulation additives, in contact with soil. 1.2 This test method is designed to measure the biodegradability of plastic materials relative to a reference material in an aerobic environment. 1.3 This test method is designed to be applicable to all plastic materials that are not inhibitory to the bacteria and fungi present in soil. 1.4 Claims of performance shall be limited to the numerical result obtained in the test and not be used for unqualified " biodegradable " claims. Reports shall clearly state the percentage of net gaseous carbon generation for both the test and reference samples at the completion of the test. Results shall not be extrapolated beyond the actual duration of the test. 1.5 The values stated in SI units are to be regarded as the standard. 1.6 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. A specific hazard statement is given in Section 8. 1.7 This ASTM test method is equivalent to ISO 17556.