Bismuth Oxide Specifications


There are two common grades of bismuth oxide. Assay-grade bismuth oxide is used as a substitute for litharge in fire assaying and is produced by oxidizing molten bismuth metal. Commercial-grade bismuth oxide also results from oxidizing molten bismuth metal and is used to increase the density of plastic resins.
Molecular Weight (g/mol.) 466.0
Tap Density (lbs./ft3) 280
Bulk Density (g/cm3) 8.9
Melting Point (°C) 820-860
Boiling Point (°C) 1890
Specific Surface Area (m2/g) 8
Thermal Conductivity (cal/s-cm-°C)  
Mohs Hardness @20°C  
L.O.I. (0-1050 deg.C in wt.%) 0.1
Specific Gravity 8.2-8.9
Color cream color to bright yellow