This International Standard specifies a method of determining the number of impurities and foreign particles in a flattened surface of polyvinyl chloride resin. It is not applicable to paste resins because of their finely divided state.
SIS SS-ISO 1265:1987 history
1987SIS SS-ISO 1265:1987 Plastics - Polyvinyl chloride resins - Determination of number of impurities and foreign particles