Fluorspar (calcium fluoride) is classified by fluorite content into acid-grade and metallurgical-grade streams, and that distinction drives its end-use across hydrofluoric acid production, aluminum smelting flux, and steel refining. Acid-grade fluorspar, typically above 97% CaF₂, is the primary feedstock for fluorochemicals including refrigerants and fluoropolymers, making it a strategically watched mineral in US industrial policy. Import volumes are sensitive to domestic HF production capacity and to trade-remedy measures that have historically applied to certain supplier countries.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.