... paint, printing ink, plastics, coating, enamel, glass, electronic etc. Precipitated BaSO4 NO. Items Specifications1 Average particle size5±0.2µm2 400 ... Soluble in water0. 2%max7 PHPH Value7.5-9.58 BaSO4 Purity98%min9 HCL Insoluble Matter98.6%min10 True Specific Gravity4 ...