Intended primarily as a simple and rapid quality-control test during the manufacture and conversion of PVC compounds. Suitable for coloured compounds. Is not recommended for compounds in the form of dry blends. The determination is carried out on a sample of the PVC compound which is maintained at an agreed temperature in still air until the colour of a Congo red paper held above it changes from red to blue. If universal indicator paper is used, the colour change is that corresponding to pH 3. The time required for the colour change is taken to be the stability time, ts. Together with ISO 182-2, replaces and cancels ISO Recommendation R 182:1970.
Số hiệu tiêu chuẩn
ISO 182-1
Tên tiêu chuẩn
Plastics; determination of the tendency of compounds and products based on vinyl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevated temperatures; part 1: Congo red method
Ngày phát hành
1990-12-00
Tiêu chuẩn tương đương
NF T51-785-1*NF ISO 182-1 (1993-09-01), IDT * DIN 53381-1 (1983-05), IDT * BS 2782-1 Method 130A (1976-09-30), NEQ * BS 2782-1 Method 130A (1991-04-30), IDT * GB/T 2917.1 (2002), NEQ * GB/T 2917.1 (2002), IDT * JIS K 6723 (1995-05-01), MOD * PN-C-89291-14 (1991-12-30), IDT * UNE 53110 (2002-09-25), IDT * GOST 14041 (1991), IDT * UNI ISO 182-1:1992 (1992-11-30), IDT * NEN-ISO 182-1:1992 en (1992-05-01), IDT
Từ khóa
Copolymers * Decomposition * Definitions * Deterioration * Determination * High-temperature testing * Homopolymers * Hydrogen chloride * Inspection * Inspection by attributes * Mouldings (shaped section) * pH measurement * pH meters * Plastics * Polyvinyl chloride * Quality control * Stability * Testing * Thermal properties of materials * Thermal stability * Thermal testing * Vinyl chloride * Moulding materials * Dehydrochlorination * PVC * Polymerisates * Congo red method
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