325mesh 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 E-mail: