It can improve the hardness and strength of concrete. It is excellent harden and waterproof matter, and insecticide.
Formulae:MgSiF6 CAS No.12449-55-7 Molecular Weight: 274.48 UN. NO.:2853 H.S. CODE:282690009007 Specification: MgSiF6-6H2O 98.5% min MgSO4-7H2O 0.5% max H2SiF6 0.2% max H2O 0.6% max Water insoluble substance 0.25% max