Antimony Trioxide
White Antimony
- CAS
- 1309-64-4
- EC
- 215-175-0
- Sectors
- Plastics & Polymers, Rubber & Elastomers, Textiles, Leather & Paper
Antimony Trioxide (CAS 1309-64-4) is an inorganic antimony oxide supplied as a fine white crystalline powder, composed of antimony and oxygen, and used mainly as a flame-retardant synergist with halogenated compounds in plastics, rubber and textiles. It functions as a key additive in polymeric systems requiring enhanced fire resistance and thermal stability.
Typical Properties
| Molecular formula | O3Sb2 |
|---|---|
| Molecular weight | 291.52 g/mol |
| Form | powder |
| Color | White |
| Odor | wh. cubic or orthorhombic cryst., odorless |
| Melting point | 655 °C |
| Boiling point | 1425 °C |
| Density | 5.2 g/cm³ (solid) |
| Water solubility | Slightly soluble. <0.1 g/100 mL at 20 °C |
| Flash point | 1550°C subl. |
| HS code | 28258000 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Antimony Trioxide
Applications
Employed with halogenated compounds in plastics, rubber, and textiles to reduce flammability. It is also used as an opacifier in ceramics and glass, a catalyst in PET production, and an additive in pigments.
Safety & Risks
Inhalation of dust may cause irritation and chronic exposure effects; process enclosures and local exhaust are essential. Avoid generation of airborne dust and contact with acids that may produce toxic fumes.
Packaging
Supplied in 25 kg multiwall bags or FIBCs with moisture barriers. Store sealed in a dry, ventilated environment away from heat and incompatible substances.