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EC number: 942-925-0
CAS number: -
Azo zinc complex pigment – melamine compound is an unreactive, odorless,
brown solid (powder) with a molecular mass of 615.79 g/mol. Using the
modified Grain method, the vapor pressure is estimated to be 2.83E-14 Pa
at 25 °C. No melting point and no boiling point could be detected up to
300°C. Endothermic reactions were detected indicated by evaporation and/
or decomposition with evolution of gas. According to OECD guideline 110,
method B, the particle size distribution of zinc,
5,5'-azobis-2,4,6(1H,3H,5H)-pyrimidinetrione complexes and melamine was
determined by scanning electron microscopy method for the sieved
fraction (< 100 µm, 14.22 % of total sample) and presented on the basis
of calculated mass fractions. The median diameter was 5.33 µm with two
main fractions of 6.87 and 92.66 % distributing in the range of 4 -100
µm. In addition, the compound is nearly insoluble (solubility in water:
0.052 mg/l) and the log Pow is estimated to be -3.15.
No compound related adverse effects are reported in a guideline
compliant sub-acute toxicity study up to the limit dose of 1000 mg/kg
bw/day and, consequently, a DNEL is not required.
Since the compound is a solid, exposure above the general occupational
dust value of 10 mg/m³ should be regarded.
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