This International Standard specifies a method for the determination of vinyl chloride monomer in homopolymerand copolymer resins of vinyl chloride and compounded materials. The method is based on sample dissolutionand headspace gas chromatography. Concentrations of vinyl chloride in the range to canbe determined. A “dry method”, suitable for PVC resins but not compounded materials, is widely used within the industry forin-house determinations. A separate International Standard based on this methodology is under development.