Bismuth trioxide

Bismuth trioxide (CAS 1304-76-3), also referenced by the formula Bi2O3, is an inorganic bismuth compound used as a functional additive and raw material in electronics manufacturing and specialty materials production.

Where is Bismuth trioxide used?

• Electronics: oxide source in low-temperature co-fired ceramics (LTCC), varistors and dielectric formulations, lowering sintering temperatures and modifying electrical properties
• Specialty glass: radiation-shielding and optical glass with elevated density and refractive characteristics, substituting for lead oxide
• Printing and packaging: yellow-to-orange inorganic pigment in ceramic inks and decorative coatings on glass and ceramic substrates
• Flux compositions and soldering materials: bismuth oxide source with defined purity
• It also serves as an oxide source where controlled melting behavior, high refractive index contribution or dense inorganic pigmentation is required.

Commercial specifications

• Fine yellow powder in varying particle size distributions
• Technical and high-purity grades; ultra-high purity grades for electronic and optical applications requiring ACS or USP compliance
• Packaging from kilogram-scale bags to bulk quantities