Physical Properties:

• CAS Number: 1309-64-4

• Appearance: White powder

• Molecular Formula: Sb₂O₃

• Molecular Weight: 291.50

• Melting Point: 656°C

• Boiling Point: 1425°C

• Specific Gravity: 5.2

• Solubility: Soluble in HCl and      tartaric acid; insoluble in water and acetic acid.

Uses:

• Serves as a flame retardant additive for materials such as      polypropylene, polystyrene, polyvinyl chloride (PVC), nylon, engineering      plastics (ABS), rubber, paints, coatings, synthetic resins, and paper.

• Acts as a fining agent in polyester fibers to remove hidden air      bubbles from molten glass.

• Used as an opacifier and whitening agent in enamel and ceramic      products.

• Functions as a passivator in the catalytic cracking and      catalytic reforming processes of petroleum and petroleum residues.