Antimony Oxides

Antimony trioxide is the dominant commercial form under this heading and functions primarily as a flame-retardant synergist in plastics, textiles, and electronics, as well as a catalyst in PET polyester production. All US imports are classified under a single tariff line (2825800000). Belgium and France are the leading suppliers to the US, with South Korea and Bolivia also significant sources. Antimony is a US-designated critical mineral, and supply-chain concentration in a small number of processing countries warrants close attention from procurement teams.