Antimony Tetroxide

Antimony Tetroxide (Sb₂O₄)

Compared to antimony trioxide, antimony tetroxide is more physically and chemically stable at high temperatures. Therefore, when used for engineering plastics that have high molding temperatures and operating temperatures, it is possible to achieve flame retardancy without reducing the physical properties of the resin.
In addition, there is no catalytic activity with polyester such as shown by antimony trioxide, and addition to polyester resin does not cause a decrease in its functional properties.
Existing chemical substance: 1-543 CAS: 1332-81-6

Antimony tetroxide (Non-medical deleterious substances)

Main applications

Flame-retardant auxiliary
Heat resistance temperature can be improved while maintaining flame retardancy that is almost equivalent to antimony trioxide.
Suitable for various kinds of engineering plastics and polyester resin.

Product outline and specifications
Chemical formula Sb₂O₄ Thermal properties Dissolves at 1060°C and forms Sb₂O₃ Appearance White powder Solubility Almost insoluble in water and acid
Molecular weight 307.5 Crystal structure Mainly equiaxial
Specific gravity 5.8 Mohs hardness 4–5 Conductivity Poor conductor
Standard table
Sb₂O₄ Sb₂O₃ Pb As Fe Whiteness Average particle size Application
min % max % max % max % max % min μm
ATE-S 95 5 0.2 0.1 0.05 78.5 1–5 Engineering plastics
Epoxy resin

About antimony oxide

* For resin compatibility list by product, click here.
* For information on handling, click here.