Erbium Oxide also called Erbia, an important colourant in glasses and porcelain enamel glazes. High purity Erbium Oxide are widely applied as dopant in making optical fibre and amplifier. Formula: Er2O3 CAS No.: 12061-16-4 Molecular Weight: 382.56 Appearance: Pink color Solubility: Insoluble in water, moderately soluble in strong mineral acids Stability: Slightly hygroscopic Purity: Er2O3/TREO 99.5%-99.9% TREO≥99% LOI≤1% Non Rare Earth Impurities: Fe2O3≤20ug/g CaO≤100ug/g