itemindex first qualityqualifiercreamappearancewhite powderwhite powderBaSO4≥98.097.098.0PH value6.5 8.06.5 8.06.5 7.5water solybles %≤0.200.300.20Fe %≤0.0040.0060.004S %≤0.0030.0050.003water %≤0.200.2028.0mesh %≤0.100.300.10partical size less than10um,%≥80.0—90.0less than 5um,%≥60.0—70.0less than2um,%≥25.0—50.0oil absorption,%15 2515 25—