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Antimony oxide is an inorganic compound with the chemical formula Sb2O3. It is a white, odorless and crystalline (sand-like) powder. ATO is an amphoteric oxide, which can dissolve both in alkaline and acidic solutions.

  • Overview
  • Application
  • Spesification


Antimony oxide
 may refer to any of the following:

  • Diantimony tetroxide, Sb2O4
  • Antimony trioxide, Sb2O3
  • Antimony pentoxide, Sb2O5
  • Antimony hexitatridecoxide, Sb6O13
  • Stibiconite, Sb3O6(OH)

Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite,[3] is white but reversibly yellows upon heating. The material, with empirical formula SbO2, is called antimony tetroxide to signify the presence of two kinds of Sb centers.

Antimony(III) oxide is the inorganic compound with the formula Sb2O3. It is the most important commercial compound of antimony. It is found in nature as the minerals valentinite and senarmontite. Like most polymeric oxides, Sb2O3 dissolves in aqueous solutions with hydrolysis. A mixed arsenic-antimony oxide occurs in nature as the very rare mineral stibioclaudetite.

Antimony pentoxide (molecular formula: Sb2O5) is a chemical compound of antimony and oxygen. It contains antimony in the +5 oxidation state.

Stibiconite is an antimony oxide mineral with formula: Sb3O6(OH). Its name originates from Greek stíbi (στίβι), 'antimony' and kónis (κόνις), 'powder', alluding to its composition and habit. It is a member of the pyrochlore super group.

Manufacturing Process


The key applications of antimony oxide nanoparticles are listed below:

  • In high conductivity applications
  • As an antistatic additive and a flame retardant in coatings, nanowires, plastics, fiber and textiles
  • In some alloy and catalyst applications
  • In electrochromics or electro-optics and magnetic machines and micro-equipment due to their high conductivity


Antimony OxideMinimum99.5%99.5%
Antimony (Sb)Minimum83.3%83.3%
Arsenic (As)Maximum0.2%0.075%
Lead (Pb)Maximum0.1%0.050%
Iron (Fe)Maximum0.002%< 0.0004%
SeleniumMaximum50 ppm< 50ppm
Specific GravityMaximum5.2-5.65.2-5.6
Average Particle Size FSSS 1.1-1.81.2-1.6
Color Excellent White 
Residue on 325 mesh (% max/min) 0.5%

< 0.1%

Antimony Oxide Safety Data Sheet
product identification
CAS No.1309-64-4
Mol wt.291.52
SynonymsAntimonious oxide, antimony(III) oxide
DENSITY5.2.-5.7 g/cm3
VAPOR PRESSURE0.406 mmHg at 550°C
VAPOR DENSITY (Air = 1)Not available.
SOLUBILITY IN H2O.001g/100ml @25°C
APPEARANCE AND ODORWhite, crystalline powder; odorless.
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