Antimony trisulfide

Antimony trisulfide (CAS 1345-04-6), also sold as antimonous sulfide or black antimony, is an inorganic sulfide compound used primarily as a flame retardant and pigment across industrial manufacturing.

Its role in combustion management and coloration makes it a recurring specification in rubber compounding, pyrotechnic formulations, and specialty coatings for various industrial sectors.

In rubber and tire manufacturing, this compound functions as both a flame retardant additive and a vulcanization modifier, improving heat resistance in finished compounds and materials.

Pyrotechnic and match manufacturing industries rely on it as a fuel component and friction-sensitive oxidizer contributor in strike surfaces and delay compositions for safety and performance.

As needle antimony, it appears in certain specialty pigment applications where its dark coloration is required in printing inks and industrial coatings for specific aesthetic and functional needs.

Mining and metallurgical processors also source it as a precursor material in antimony refining and recovery operations, ensuring a steady supply for downstream chemical production.

The material is supplied as a fine black powder, with particle size and purity specifications varying by end-use grade. Technical grade is the standard commercial form for most uses.

High-purity grades are available for pyrotechnic and specialty chemical applications. Typical purity levels range from 95% to 99%+, with moisture content and heavy metal impurity limits specified.