325 Mesh High AL High fire-resistant temperature & fired whiteness, competitive price, abundant reserves, mainly used in refractory bricks & ceramic tiles industries. The specification is as follows: SIO2: 32% max. AL2O3: 45% FE2O3: 0.35% max. Na2O: 0.12% max. K2O: 1.5% max. CaO: 0.15% max. TiO2: 0.05% max. MgO: 0.1% max. Natural Whiteness: 85 Fired whiteness: 90 Loss of ignition: 20~23 PH: 5.5~6.5 325 Mesh residue: 1.0% max. Moisture: 15% max. ***Above content only for reference. ***Packing: 25KGS / 40KGS / 50KGS / 1000KGS net in plastic woven bags, or customers option. *** Process covering products according to customers requirements. Welcome your inquiry for further details! We will supply our best goods & service to you. Thanks & best regards!