ISO 305:2019 塑料 聚氯乙烯和有关含聚合物和共聚物及其混合物的热稳定性的测定 色变法

标准编号：ISO 305:2019

中文名称：塑料 聚氯乙烯和有关含聚合物和共聚物及其混合物的热稳定性的测定 色变法

英文名称：Plastics — Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds — Discoloration method

发布日期：2019-05

标准范围

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.

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