3,3'-[(2,5-dichloro-p-phenylene)bis[imino(1-acetyl-2-oxoethylene)azo]]bis[4-chloro-N-(5-chloro-o-tolyl)benzamide]

Endpoint summary

Description of key information

Category assessment:
Not irritating on rabbit skin (OECD 404)
Not irritating in rabbit eyes (OECD 405)

Key value for chemical safety assessment

Skin irritation / corrosion

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin:

Reliable data from several studies on skin irritation are available for four members of the disazocondensation yellow pigments category (CAS 5580-57-4, 5280-80-8, 68516-73-4, 79953-85-8). These data reveal a very low skin irritation potential for the disazocondensation yellow pigments of this category. In a primary dermal OECD guideline irritation study (OECD 404, CIBA, 830500, 1983), 3 female New Zealand White rabbits were dermally exposed to 0.5 g of the test substance (CAS 5280-80-8) for 4 hours under semiocclusive conditions. Animals then were observed for 7 days. Irritation was scored by the method of Draize as described in the OECD guideline 404. The mean score for the 24, 48 and 72 h reading for erythema was 0.44 and for edema was 0. The skin reactions observed were fully reversible within 48 hours. Under the conditions of the present experiment the test substance (CAS 5280 -80 -8) was found to be non-irritant and not corrosive when applied to the rabbit skin. For three further test substances of this category (CAS 5580-57-4, 68516-73-4, 79953-85-8) similar results were found although the treatment was under more severe conditions: On the intact skin (flanks) of three rabbits 0.5 g of the substance, moistened with tap water or polyethylene glycol, was applied onto skin for 24h under occlusive conditions. Observations 24h, 48h, 72h, after treatment did not reveal formation of erythema or edema or only light erythema.

No reliable study on skin irritation of one category member (CAS 5580-58-5) is available. But due to the consistent observation that the other disazocondensation yellow pigments do not induce skin irritation it is concluded that this member is also not irritating to skin. In summary, it is concluded that disazocondensation yellow pigments of this category are not irritating to skin and have not to be classified as skin irritants.

 

Eye:

Reliable data from several studies on eye irritation are available for four members of disazocondensation yellow pigments category (CAS 5580-57-4, 5280-80-8, 68516-73-4, 79953-85-8). These data reveal a low eye irritation potential for the disazocondensation yellow pigments of this category. Eye irritation tests according to OECD guideline 405 were done with two members of the category (CAS 5280-80-8 (CIBA, 1983) and CAS 68516-73-4 (Dominion, 2011)). The tests were performed with three New Zealand White rabbits. Eyes were left unwashed after application of 0.1 g or 0.1 mL (0.03 g) of test substance, respectively and the animals were observed 7 days or 72 hours, respectively. For test substance with CAS 5280-80-8 the mean scores for the 24, 48 and 72 h reading for conjunctivae redness, corneal opacity, iritis, and conjunctivae chemosis were 0.1, 0.1, 0, and 0.3, respectively. After 72 hours all reactions were fully reversed. Under the conditions of the present experiment the test substance was found to be slightly irritant and not corrosive when applied to the rabbit eye mucosa. There was a clear tendency of recovery towards the end of the observation period and no classification according to EU- or EU-GHS-requirements is necessary. The scores for the test substance with CAS 68516-73-4 were all 0 for conjunctivae redness, corneal opacity, iritis, and conjunctivae chemosis. For two further test substances of this category (CAS 5580-57-4 (CIBA, 1975), 79953-85-8 (CIBA, 1973)) reliable studies were done which were similar to OECD guideline 405. They also showed only slight or no irritation to these category members. No reliable study on eye irritation of one category member (CAS 5580-58-5) is available. But due to the consistent observation that the other disazocondensation yellow pigments do not induce eye irritation it is concluded that this member is also not irritating to eyes.

In summary, it is concluded that disazocondensation yellow pigments of this category are not irritating to the eye and have not to be classified as eye irritants.

Justification for classification or non-classification

Dangerous Substance Directive (67/548/EEC)

The available studies are considered reliable and suitable for classification purposes under 67/548/EEC. As a result the substance is not considered to be classified as irritating for skin or eyes under Directive 67/548/EEC, as amended for the 28th time in Directive 2001/59/EC.

 

Classification, Labelling, and Packaging Regulation (EC) No. 1272/2008

The available experimental test data are reliable and suitable for classification purposes under Regulation 1272/2008. As a result the substance is not considered to be classified for irritation under Regulation (EC) No. 1272/2008, as amended for the third time in Directive EC 618/2012.