Average particle size 5?.2μm Moisture 0.2%max #400 Sieve Reside 0.01%max Whiteness 94min Oil Absorption 14-17% Soluble in Water 0.2%max PH Value 7.5-9.5 BaSO4 Purity 97%min HCL Insoluble Matter 97%min True Specific Gravity 4.3G/cm3