ISO 305:2019 PDF

Scope: This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are: — Method A: Oil-bath method; — Method B: Oven method. These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested. The stability times given by the two methods might not be similar and cannot be used for direct- comparison purposes.

ISO 305:2019 history

2019 ISO 305:2019 Plastics — Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds — Discoloration method
1990 ISO 305:1990 Plastics; determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds; discoloration method
1976 ISO 305:1976 Plastics — Determination of thermal stability of polyvinyl chloride, related chlorine-containing polymers and copolymers, and their compounds — Discoloration method