Bismuth(III) oxide

Bismuth(III) oxide, also known as bismuth trioxide or bismite (CAS 1304-76-3, EC 215-134-7, formula Bi2O3), is an inorganic bismuth compound with no assigned E-code. It is commercially referenced under names including BISMUTH OXIDE and Bi2-O3, and is classified under HS code 28259021.

In electronics manufacturing, Bi2O3 functions as a sintering aid and flux in ceramic capacitors and varistors, lowering the densification temperature of oxide blends. In printing and packaging, it serves as a yellow inorganic colorant, providing opacity and thermal stability in specialty inks and coatings where organic pigments are unsuitable.

Bismuth(III) oxide is supplied as a heavy yellow powder and is available in technical and high-purity grades. Procurement should confirm REACH compliance and supplier Safety Data Sheet documentation prior to ordering. Standard packaging formats for industrial supply typically include fibre drums or multi-layer bags.