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Azocolourants and Azodyes

By Little Pro on 2016-07-17 Views:  Update:2017-01-18

Azocolourants and Azodyes are one group of synthetic dyestuffs based on nitrogen that are often used in textile industry. Some AZO dye stuffs may break down under certain conditions to produce carcinogenic and allergenic aromatic amines.

Azocolourants and Azodyes and REACH annex XVII

Azocolourants and Azodyes are included in REACH Annex XVII restricted substances list (entry 43). The restriction conditions are listed as follows:

1. Azodyes which, by reductive cleavage of one or more azo groups, may release one or more of the aromatic amines listed in Appendix 8, in detectable concentrations, i.e. above 30 mg/kg (0,003 % by weight) in the articles or in the dyed parts thereof, shall not be used, in textile and leather articles which may come into direct and prolonged contact with the human skin or oral cavity, such as clothes, footwear,  and bags, etc.

2.  Azodyes, which are contained in Appendix 9, ‘List of azodyes’ shall not be placed on the market, or used, as substances, or in mixtures in concentrations greater than 0,1 % by weight, where the substance or the mixture is intended for colouring textile and leather articles.

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