Plastikë - Përcaktimi i qëndrueshmërisë termike të poli (vinil kloridit), lidhjet me homopolimerët dhe kopolimerët të cilat përmbajnë klorinë dhe përbërjet e tyre - Metoda e çngjyrosjes (ISO 305:1990)
Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:1990)
Specification of a comparing method, based on the increasing discoloration of polyvinylchloride when exposed to heat, due to a decomposition reaction. Test pieces in diskform are placed between aluminium pieces and heated to the specified test temperature. After specified periods one test specimen at a time is taken out and the degree of discoloration assessed by visual examination or by measuring with a photometer.
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