What are Azo dyes and its potential health hazard? Azo dyes are colorants which are an integral part of dyestuff. They have one or several azo groups (-N=N-) in the molecular structure. The listed aryl amines formed through reduction cleavage from azo colorants or azo dyes and are potentially or have proven to be carcinogenic.
It is commonly found in dyed textiles, plastics and leather.
Related legislation (non-exhaustive) European Union : REACH Annex XVII entry 43 China : GB 18401 and GB 20400
Maximum limit (non-exhaustive) 30 mg/kg (each) or 30 PPM 20 mg/kg (each) or 20 PPM
Case studies of issues resolved
Case 1: Azo compound detected in a black colour, 30s interlocked knitted t-shirt
Case 2: A scarf printed with pigment showed the presence of amines (O-benzidine > 100PPM). The pigment had a direct colour mix-up. By analysing the mixture of inks and base binders, the issue was resolved by appropriate replacement.
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