RS ISO 14362-3: 2017
Textiles — Methods for determination of certain aromatic amines derived from azo colorants — Part 3: Detection of the use of certain azo colorants, which may release 4-aminoazobenzene


Azo colorants that are able to form 4-aminoazobenzene, generate under the conditions of ISO 14362-1,
the amines aniline and 1,4-phenylenediamine. The presence of these 4-aminoazobenzene colorants
cannot be reliably ascertained without additional information (e.g. the chemical structure of the
colorant used) or without a special procedure.
This document is supplementary to ISO 14362-1 and describes a special procedure to detect the use, in
commodities, of certain azo colorants, which may release 4-aminoazobenzene, and that are
— accessible to reducing agent without extraction, particularly concerning textiles made of cellulose
and protein fibres (e.g. cotton, viscose, wool, silk), and
— accessible by extracting the fibres (e.g. polyester or imitation leather).
For certain fibre blends, in 9.3 and 9.4 (with and without extraction) may need to be applied.
The procedure also detects 4-aminoazobenzene (Solvent Yellow 1), which is already available as free
amine in commodities without reducing pre-treatment.
The use of certain azo colorants, which may release, by reductive cleavage of their azo group(s), one or
more of the other aromatic amines listed in the Regulation (EC) No 1907/2006 of the European Parliament
and of the Council on the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) as
regards Annex XVII, except 4-aminoazobenzene, cannot be determined quantitatively with this method.

General Information

RS ISO 14362-3: 2017ADOPTED ISO STANDARDSTextiles and leather technology23First Edition
Oct 2022
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