DIN Standards Committee Materials Testing
Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene (ISO/DIS 17234-2:2026); German and English version prEN ISO 17234-2:2026
Abstract
ISO 17234-2:2011 is supplementary to ISO 17234-1 and describes a special procedure to detect the use of certain azo colorants in commodities, which can release 4-aminoazobenzene. The procedure also detects 4-aminoazobenzene (Solvent Yellow 1) which is already available as free amine in commodities without reducing pretreatment. Azo colorants that are able to form 4-aminoazobenzene generate, under the conditions of ISO 17234‑1, 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.
Begin
2026-04-16
WI
00289294
Planned document number
DIN EN ISO 17234-2
Project number
06237102
Responsible national committee
NA 062-05-52 AA - Chemical test methods for leather and leather auxiliaries
Responsible european committee
CEN/TC 289/WG 1 - Chemical test methods
Responsible international committee
IULTCS - International Union of Leather Technologists and Chemists Societies
