6000mesh Average particle size: 1?.2um Moisture: 0.2%max #400 Sieve Reside: 0.008%max Whiteness: 95min 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