Barium Sulphate 98%min, 1, powder form 2, used for coating, paint Barium Sulphate specification; Purity: 98% minPH Value: 6.5 - 9.0Water insoluble: 0.3% maxFe: 0.004% maxMoisture: 0.3% maxFineness (325mesh pass): 0.2% maxOil absorption: 10-30%Whiteness: 94% min.