Characteristics:

Antimony oxide is the inorganic compound with the formula Sb2O3. It is the most important commercial compound of antimony.Antimony oxide is an amphoteric oxide, it dissolves in aqueous sodium hydroxide solution and concentrated mineral acids. When heated with carbon, the oxide is reduced to antimony metal. With other reducing agents such as sodium borohydride or lithium aluminium hydride, the unstable and very toxic gas stibine is produced. When heated with potassium bitartrate, a complex salt potassium antimony tartrate, KSb(OH)2•C4H2O6 is formed. 

Applications:

Antimony Oxide is primarily used as a fire retardant in plastic insulations as well as electronic devices and household appliances. Sb2O3 can be used as a filling agent for various rubber, ceramic and fiber products and as a pigment in oil paints and as a catalytic agent in organic synthesis 

Compound Formula

Sb2O3

CAS

1309-64-4

Appearance

Fine white powder

Molecular Weight

104.6 g/mol

Melting Point:

656 °C (1,213 °F; 929 K)

Boiling Point

1,425 °C (2,597 °F; 1,698 K) (sublimes)

Density

5.2 g/cm3, α-form
5.67 g/cm3 β-form

Form M

crystals or powder

Solubility in water

Dissolved concentration of 370 ± 37 µg/L was obtained with a loading of 10 mg/L after 7 days of exposure. Temperature varied between 20.8°C (t=0; start of the test) and 22.9°C
10.7 g/L (100 °C)

Solubility

soluble in acid

Sb2O3    %

99.99 min

AI       %

0.0005max

As       %

0.0005max

Bi       %

0.0002max

Ca       %

0.0005max

Co       %

0.0002max

Cr       %

0.0001max

Cu       %

0.0002max

Fe       %

0.0005max

Mg       %

0.0005max

Na       %

0.0020max

Ni       %

0.0001max

Pb       %

0.0005max

S        %

0.0010max

Zn       %

0.0003max

Water loss(105℃/2h)%

0.1max

THCI%

99 min

Color

L

97.0  min

b

3.0  min

325 mesh screening  %

0.1 max

Mean particle size um

2-5