NF EN ISO 182-3, T51-785-3 (12/2023)

This document specifies a method for determining the thermal stability at elevated temperatures of compositions and products based on homopolymers and copolymers of vinyl chloride (PVC in the following text), which are subject to dehydrochlorination (release of hydrogen chloride). This document applies to the characterization of PVC-based compositions and products, in particular with regard to the effectiveness of their heat stabilization systems. It is applicable to compositions and products based on colored PVC, where a heat discoloration test may be unsatisfactory. This document is applicable to materials and products composed of PVC. It may be applicable to polymers in powder form under appropriate conditions to be agreed between the interested parties. This document does not apply to PVC compositions in the form of dry mixes, as these materials may not be sufficiently homogenized. This document does not apply to PVC compositions and products which, at elevated temperatures, emit decomposition products in addition to hydrogen chloride which may affect the conductivity of water when present. absorbed. In this case, a suitable method for the determination of chloride ions (Cl-) in the absorbing solution shall be employed (see ISO 182-4[2]). This document may also be applied to other plastic materials which may evolve hydrogen chloride or other hydrogen halides when heated under particular conditions prescribed in the appropriate specifications or agreed between interested parties.
(Automatic translation from French)