ISO 182-1:1990

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

Publication date: Dec 6, 1990

General information

Current stage: 90.20 Effective date: Apr 15, 2025

Originator: ISO

Owner: ISO/TC 61/SC 9

Type: International Standard

ICS: 83.080.20

Languages: French English

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Status: Published

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 182:1970

NOW

PUBLISHED
ISO 182-1:1990
90.20 Standard under periodical review
Apr 15, 2025

REVISED BY

ABANDON
ISO/DIS 182-1

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