Azo Testing

Azodye almost exists in all colours as one of the most widely-used synthetic dyestuffs in printing technique (for textiles). It is used for dyeing and printing of natural and synthetic fibres, also for the colouring of paints, plastics and rubber.
When textiles, garments and leather articles come into direct contact with the skin, some azodyes will decompose into arylamines having carcinogenic properties (i.e. carcinogenic azodyes) when they blend with metabolite (perspiration) of human body. However, it presents great hazard if carcinogenic azodyes are absorbed by human bodies. For the purpose of clarity, there are as many as 3,000 azodyes in use and most of them are safe. Only about 200 azodyes are forbidden as they can be reduced to release arylamineshaving carcinogenic properties.
 

Regulations
EU REACH Annex XVII
Oeko-Tex®Standard 100
China GB 18401 National General Safety Technical Code for Textile Products
Other related regulations
 
Arylamines having carcinogenic properties:

SN Substance CAS number
1 4-aminobiphenyl 92-67-1
2 benzidine 92-87-5
3 4-chloro-o-toluidine 95-69-2
4 2-naphthylamine 91-59-8
5 o-aminoazotoluene 97-56-3
6 5-nitro-o-toluidine 99-55-8
7 p-chloroaniline 106-47-8
8 2,4-diaminoanisole 615-05-4
9 4,4′-diaminobiphenymethane 101-77-9
10 3,3′-dichlorobenzidine 91-94-1
11 3,3′-dimethoxybenzidine 119-90-4
12 3,3′-dimethylbenzidine 119-93-7
13 3,3′-dimethy1-4,4′-diaminobiphenylmthane 838-88-0
14 p-cresidine 120-71-8
15 4,4′-methylene-bis-(2-chloroaniline) 101-14-4
16 4,4′-oxydianiline 101-80-4
17 4,4′-thiodianiline 139-65-1
18 o-toluidine 95-53-4
19 2,4-toluylendiamine 95-80-7
20 2,4,5-trimethylaniline 137-17-7
21 o-anisidine 90-04-0
22 4-aminoazobenzene 60-09-3
23 2,4-xylidine 95-68-1
24 2,6-xylidine 87-62-7


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