1.1 This practice measures the tendency for staining of a poly(vinyl chloride) composition to occur due to migration into the plastic of a staining antioxidant (or other compounding additive) from rubber with which it is in intimate contact.

1.2 This practice may be used to determine relative staining resistance of vinyl compounds by testing them against a single standard rubber composition (Note 1). It may also be used to compare relative staining tendencies of two or more rubber compositions by testing them against a single standard poly(vinyl chloride) composition.

1.3 The values stated in SI units are to be regarded as the standard.

Note 1--The preparation of suggested standard compositions is described in the Appendix X1. This procedure may also be applicable to determine stain resistance of plastic materials other than poly(vinyl chloride) in contact with rubber.

Note 2--There is no similar or equivalent ISO standard.

1.4 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.