Aktívna norma | Vydaná: 19.05.2022

ISO 4645:2022-ed.2.0

Rubber and rubber products — Identification of antidegradants — Thin layer chromatographic methods
(Caoutchouc et produits a base de caoutchouc — Identification des agents de protection — Méthodes par chromatographie en couche mince)

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Podrobné informácie

Označenie: ISO 4645:2022-ed.2.0

Dátum vydania: 19.05.2022

Stránok: 12

Krajina: Medzinárodná technická norma

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Anotácia

Description / Abstract: This document describes two methods for identification of antidegradants (antioxidants, antiozonants and stabilizers) which can be present in raw rubber, unvulcanized compounded rubber, or rubber products, by thin layer chromatography. Method A is a simplified method that provides for the identification of known materials and can be used to check the presence or absence of a particular antidegradant which is expected to be present. Method B is a more detailed method that enables a greater degree of separation of the spots to be obtained and therefore can be used to detect and identify an unknown antidegradant. Antidegradants to which these methods are applicable include phosphited polyalkyl phenols, substituted bisphenols, secondary amines, substituted cresols and substituted p-phenylenediamines. Examination for other types of antidegradants is possible under the same condition when there is a standard chromatogram.

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