CAS NO.: 16949-65-8 Molecular formula: MgSiF6.6H2O Molecular Weight: 274.47 Melting point: 120 ℃ (decomposition) Density: 1.788 Content: ≥ 98% Properties: colorless or white needle crystal or diamond. Odorless. Soluble in water, soluble in acid, insoluble in hydrofluoric acid, insoluble in alcohol. Uses: used as a concrete hardener and waterproofing agent for silica surface treatment and manufacture of building ceramics.