Barium Carbonate Powder Chemical formula: BaCO3 Molecular weight: 197.35 Bulk Density: 0.40 g/cm3 min. Appearance: White powder, Soluble in acid,Insoluble in water, Poisonous Typical Analysis: Purity 99.20% min. Moisture 0.30% max Total Sulphur as SO4 0.30% max HCL Insoluble Matter 0.25% max. Iron (Fe) 0.004% max +325 Mesh1.00% max.