Commodity: Sodium Carbonate (Soda Ash Light) National standard: GB 210-1992 Specification: Total alkali(AS Na2CO3) 99.4% min Chlorizate(AS NaCL) 0.47% max Iron(AS Fe) 0.0038% max Insoluble in water 0.034% max Loss on ignition 0.68% max Tap density(G/ML) 0.88 min