Specifications: Sodium silicate 1) Modulus: 2.0~3.5 (according to customers requirements) 2) Na2 Specifications: Sodium silicate 1) Modulus: 2.0~3.5 (according to customers requirements) 2) Na2O+SiO2: 98% min. 3) Water insoluble: 0.9% max. 4) Fe: 0.12% max. Sodium metasilicate pentahydrate: 1) SiO2: 28.5+/-0.7% 2) Na2O: 28.8+/-0.7% 3) Water-insoluble: 0.03% max 4) Iron (Fe): 0.03% max 5) PH value: 12.5+/-0.3 6) Loss on ignition: 43.0+/-1.0% 7) Particle size: >1250um,