Fluorspar Containing 97% or Less Calcium Fluoride

Acid-grade and metallurgical-grade fluorspar containing up to 97% calcium fluoride by weight is a critical input for hydrofluoric acid production, aluminum smelting, and steel flux applications, making it a strategically monitored mineral in US supply-chain policy. Classified under 2529210000, this grade is distinguished from higher-purity fluorspar (above 97% CaF₂) by its calcium fluoride concentration, which determines suitability for acid-grade versus metallurgical end uses. China and Mexico are the leading suppliers to the US, with Mongolia and Pakistan also among recorded sources. China's dominant position in global fluorspar production has drawn attention in critical minerals assessments, and importers should monitor any applicable Section 301 tariff exposure on Chinese-origin shipments.