Sodium fluorosilicate(based on dry): 99%min
Iron: 0.02%max
Free acid(based on HCL): 0.1% max
Heave metal(based on Pb): 0.02% max
Water-insoluble matter: 0.4% max
Loss on Drying at 105C: 0.3% max
Fineness(through 250 um test bolter): 90%min