Disodium [4-hydroxy-3-[(2-hydroxy-4-nitrophenyl)azo]naphthalene-1-sulphonato(3-)][1-[(2-hydroxy-4-nitrophenyl)azo]-2-naphtholato(2-)]chromate(2-)

Endpoint summary

Description of key information

FAT 20011/E is a black colored powder at 20 °C. The substance showed no melting or boiling point up to 330 °C while at higher temperatures thermic decomposition occurred. The average relative density at 20 °C was found to be 1.4955 g/cm³, as determined by a study performed according to OECD Guideline 109. The percentage of FAT 20011/E with an inhalable particle size <100 μm was 33.5 %, with a thoracic particle size <10.0 μm was 2.60 % and with respirable particle size <5.5 μm was 0.29 %. The partition co-efficient n-octanol/water of FAT 20011/E at 20 °C was determined be 0.291 (log Pow). The water solubility of FAT 20011/E at 20 °C was determined to be 2.0 g/l. The surface tension of FAT 20011/E was determined to be 44.444 mN/m at 20 °C. The flash point determination is considered to be technically not feasible, as thermic decomposition was seen in the melting point study. FAT 20011/E showed no auto-ignition until 550 °C and the substance is considered not to be highly flammable and does not ignite spontaneously when in contact with water or humid air. The substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing are required. Oxidising properties were not determined. In accordance with Column 2 of REACH Annex VII, this study does not need to be conducted as this substance is incapable of reacting exothermically with combustible materials on the basis of its chemical structure.