Sodium Silicate Specifications: 1) Weight Ratio (SiO2/Na2O): 2.2~3.7 (according to customers' requirements) 2) Na2O+SiO2: 98% min. 3) Water insoluble: 0.9% max. 4) Fe: 0.1% max. Minimum Order: 20MT Packing 1000kg/PP woven bag for block sodium silicate. 50kg/PP woven bag for granular sodium silicate.