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Antimony trioxide(Sb2O3) is a pure white ultra-fine powder in cubic crystal system. It is the most stable compound of antimony, with the molecular weight 291.5 and melting point 656℃, cubic crystal type (a stable type) has the density of 5.3g/cm3.

Antimony trioxide is also named antimony white, and belongs to amphoteric oxide. It is insoluble in water, ethanol, dilute sulfuric acid, dilute nitric acid, but soluble in concentrated hydrochloric acid, sulfuric acid, alkali, and tartaric acid.

PROPERTIES	Antimony Trioxide
	PURITY
Sb2O3 ≥	99.50%	99.90%	99.80%
As2O3 ≤	0.06%	0.02%	0.04%
PbO ≤	0.12%	0.02%	0.05%
Fe2O3 ≤	0.006%	0.002%	0.004%
CuO ≤	0.002%	0.002%	0.002%
Se ≤	0.005%	0.002%	0.004%
Cd ≤	5ppm	5ppm	5ppm
Average Particle Size （μm)	≤0.8	≤0.8	≤0.8
Whiteness （%）	≥93	≥97	≥97

ATO is widely used in PVC,PP,PE,PS,ABS,PU,PA,coating,synthetic resin,synthetic fiber as flame retardant and additives,high flame retarding ability,less influence on mechanical properties of base material.

ATO can also be used in rubber industry as filler and flame retardant ,in enameled and ceremic products as covering agent and whitening agent and as catalyst for organic synthesis

Antimony Trioxide

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