Antimony-based flame retardant is one of the most important inorganic flame retardants, can greatly improve the performance of halogen flame retardants. Antimony-based flame retardant is the main varieties of antimony trioxide (ATO), colloidal antimony pentoxide and sodium antimonate. One of the most important is the ATO, which is almost all halogen flame retardant synergist indispensable.

 

1, performance

The molecular formula of antimony trioxide is Sb2O3, the relative molecular mass is 91.60, the theoretical antimony content is 83.54%. Sb2O3 is a white cubic crystal with a density of 5.2 g / cm3 and a refractive index of 2.087. Sb2O3 has a melting point of 6560C, a heat of fusion of 54.4-55.3 kj / mol, a heat of vaporization of 36.3-37.2 kj / mol and a standard formation enthalpy of -692.5 kj / mol. Do not dissolve in water and ethanol, soluble hydrochloric acid hot and sour, concentrated sulfuric acid, concentrated alkali, oxalic acid, tartaric acid and fuming nitric acid.

 

2, the quality indicators

Antimony trioxide Sb2O3: ≥99.8%

PbO: ≤0.05%

Copper oxide CuO: 0.0004

Iron oxide Fe2O3: 0.0025

Tartaric acid insoluble matter TAL: 0.025

Whiteness: 95

Particle size: 0.5 μm to 1 μm