Average particle size 40?.5祄 Moisture Max0.2% #400 Sieve Reside 1%max Whiteness 93min Oil Absorption 14-18% Soluble in Water 0.2%max PH Value 7.5-9.5 BaSO4 Purity 97%min HCL Insoluble Matter 96.5%min True Specific Gravity 4.3G/cm3