| IUPAC name
|Density||5.2 g/cm³ α-form, 5.67 g/cm³ β-form|
|370 ± 37 µg/L|
|Solubility||Soluble in acids and bases|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|7000 mg/kg, oral (rat)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Antimony trioxide is an oxide of antimony. It is used as a flame retardant in combination with halogenated materials, an opacifying agent in glass and ceramic production, in some special pigments, and as a catalyst.
Sb2O3 + 6 HCl → 2 SbCl3 + 3 H2O
With carbon, antimony trioxide forms elemental antimony.
2 Sb2O3 + 3 C → 3 CO2 + 4 Sb
Antimony trioxide is an odorless, white solid.
Antimony trioxide can be prepared by reaction of antimony metal with oxygen at high temperatures. This is best done in a furnace. The product will sublime during the process of making it.
- Glass and ceramic production
- Catalyst for polyethylene terephthalate production
Antimony(III) oxide is a suspected carcinogen. It should be handled with care, especially at high temperatures where it tends to sublime.
Can be stored in any container. Should be stored away from acid and base vapors.