Antimony Trioxide Properties
| Synonyms | Antimony Sesquioxide, Antimony Oxide, Flowers of Antimony | |
| Cas No. | 1309-64-4 | |
| Chemical formula | Sb2O3 | |
| Molar mass | 291.518 g/mol | |
| Appearance | white solid | |
| Odor | odorless | |
| Density | 5.2 g/cm3, α-form，5.67 g/cm3 β-form | |
| Melting point | 656 °C (1,213 °F; 929 K) | |
| Boiling point | 1,425 °C (2,597 °F; 1,698 K) (sublimes) | |
| Solubility in water | 370 ± 37 µg/L between 20.8°C and 22.9°C | |
| Solubility | soluble in acid | |
| Magnetic susceptibility (χ) | -69.4·10−6 cm3/mol | |
| Refractive index (nD) | 2.087, α-form,2.35, β-form |
Grade & Specifications of Antimony Trioxide:
| Grade | Sb2O3 99.9% | Sb2O3 99.8% | Sb2O3 99.5% | |
| Chemical | Sb2O3 %min | 99.9 | 99.8 | 99.5 |
| AS2O3 %max | 0.03 | 0.05 | 0.06 | |
| PbO %max | 0.05 | 0.08 | 0.1 | |
| Fe2O3 %max | 0.002 | 0.005 | 0.006 | |
| CuO %max | 0.002 | 0.002 | 0.006 | |
| Se %max | 0.002 | 0.004 | 0.005 | |
| Physical | Whiteness(min) | 96 | 96 | 95 |
| Particle size(μm) | 0.3-0.7 | 0.3-0.9 | 0.9-1.6 | |
| - | 0.9-1.6 | - | ||
What is Antimony Trioxide used for?
Antimony Trioxide is primarily used in combination with other compounds to provide flame retardant properties. The main application is as flame retardant synergist in combination with halogenated materials. The combination of the halides and the antimony is key to the flame-retardant action for polymers, helping to form less flammable chars. Such flame retardants are found in electrical apparatuses, textiles, leather, and coatings. Antimony(III) Oxide is also an opacifying agent for glasses, ceramics and enamels. It is a useful catalyst in the production of polyethylene terephthalate (PET plastic) and the vulcanization of rubber.
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