B 1985 (OTTO) Boron trioxide, 99.98% Cas 1303-86-2 - used for preparing specimens of Bi4B2O9 ceramics. B 1985 (OTTO) Boron trioxide, 99.98% Cas 1303-86-2 - used for WO3/B2O3/Al system for investigating the impact of Ar gas pressure on the SHS reaction products.