Synonyms: Lead(II) oxide CAS: 1317-36-8 Molecular Formula: PbO Molecular Weight: 223.20 g/mol Test Specification Appearance (Color) Orange Appearance (Form) Powder and/or chunks Assay (PbO) 95+% Chloride (Cl) 0.005% max. Copper (Cu) 0.002% max. Insoluble in CH3COOH 0.1% max. Iron (Fe) 0.005% max. Nitrate (NO3) 0.01% max. Silver (Ag) 0.0005% max. Substances not Pptd. by H2S 0.2% max.