Antimony trioxide manufacturers can be found in countries around the world, including the U.S., China, and India. It acts as a flame retardant in rubber, plastics, textiles, fiberglass, adhesives, and paper. The compound can also be found in nature in the minerals senarmontite and valentinite.
The compound has a molecular weight of 291.5 g/ml and is somewhat soluble in cold water. It is also soluble in potassium hydroxide, hydrochloric acid, acetic acid, and tartaric acid. Antimony trioxide has a melting point of 1,212.8° F (656° C) and a boiling point of 2,822° F (1,550° C).
Antimony trioxide is highly toxic when it contacts skin. Protective clothing should be used when handling the compound. It can also cause low blood pressure, vomiting, shallow breathing, coma and even death when ingested. Breathing the compound in for extended periods can also irritate air passages.