Molecular Formula: BaSO4 Molecular weight: 233.39 Appearance: White Oblique side crystal . Index name Standard Barium sulfate(BaSO4) 98%min Iron oxide(Fe2O3) 0.004%max Whiteness% 90~96 pH value 6.5~8.0 Oil absorption 15-30max 45um sieve residue 0.2%max Water-soluble material 0.3%max. 25 Kgs in Net Bag, 16 Mts in The 20'FCL.