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Diantimony trioxide CAS#1309-64-4
Basic Information
Dual Crystal Forms：Available in orthorhombic (valentinite) and cubic (senarmontite) structures, offering stable physical properties for diverse industrial applications.
High Thermal Stability：Melts at 656 °C and sublimes at elevated temperatures, ensuring reliable performance in high-temperature processing and refining operations.
Excellent Chemical Resistance：Practically insoluble in water and organic solvents, while readily soluble in acids and alkalis, enabling controlled reactivity in chemical formulations.
High Purity Optical Properties：High refractive index (2.087) and well-defined molecular structure (Sb₂O₆ dimers) support use in specialty glass, ceramics, and catalyst systems.
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product description
Product Description of Diantimony trioxide CAS#1309-64-4
Antimony trioxide: orthorhombic (valentinite, 5.67 g/cm³) or cubic (senarmontite, 5.20 g/cm³, dimeric Sb₂O₆). Refractive index 2.087; mp 656 °C (O₂-free); bp 1550 °C (sublimes); sublimes at 400 °C (vacuum). Very slightly soluble in water, insoluble in organics; soluble in HCl, caustic alkalis and tartaric acid.
Product Application of Diantimony trioxide CAS#1309-64-4
Diantimony trioxide is a key flame-retardant additive for plastics. Industrial grades (99.0–99.9% purity) are produced by oxidizing antimony metal/sulfide ores at 600–800 °C, with particle size controlled via processing. Also used as a white pigment; fine particles maximize whiteness/opacity, coarse grades for translucent plastics. Insoluble in water, low moisture loss.
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