Formula: Pr₆O₁₁ (typical non-stoichiometric form) CAS: 12037-29-5 EC No.: 234-857-9 M (Molar Mass): 1021.44 g/mol (for Pr₆O₁₁) D (Density): 6.88 g/cm³ mp (Melting Point): ~2180 °C bp (Boiling Point): ~3760 °C Optical Rotation: Not applicable

Assay (as Pr₆O₁₁): ≥ 99.9 % (Rare Earth Oxides basis) Appearance: Black-brown powder. Purity (Rare Earth Impurities): ≤ 0.1 % total Lanthanum (La): ≤ 0.01 % Cerium (Ce): ≤ 0.01 % Neodymium (Nd): ≤ 0.05 % Other Non-RE Impurities (Fe, Ca, Si, etc.): ≤ 0.01 % each Loss on Ignition (1000°C): ≤ 1.0 %