Magnesium Fluorosilicate

Magnesium Fluorosilicate

Property: Clear or white, rhombohedra or acicular crystal, odorless.
Application:Mainly used as a water----repellent and a hardener to improve the hardness and intensity of concrete.
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Formula: MgSiF6·6H2O
CAS No.:16949-65-8
M.W.: 274.48
Properties: The Magnesium Silicofluoride is clear or white, rhombohedra or acicular crystal, odorless. The relative density is 1.788. The melting point is 120°C(decomposition). It is hard to deliquesce, but the crystal water will be lost under efflorescence. It is decomposed by dehydration when the temperature is over 80°C, and gives out silicon tetrachloride gas at the same time. It dissolves easily in water and dilute acids, but hardly dissolve in hydrofluoric acid and insolubilizes in alcohols. Its water solution presents an acidic nature. When reacted on alkalis, it will generate relative fluor-complex and silica. It is poisonous!

Specification: 

Assay (MgSiF6.6H2O)98.5% min
Water-insoluble matter0.2% max
H2SiF60.5% max
MgSO4.7H2O0.3% max
H2O0.5% max

Application: The Magnesium Silicofluoride is mainly used as a water----repellent and a hardener to improve the hardness and intensity of concrete. Besides, it is applied in surface fluor efflorescence----proofing for constructions made of ganister bricks, the production of ceramics, insect prevention for fabrics, and also used as a pesticide. 

Storage: Store at a ventilating and dry place, prevent wetting and keep away from strong inorganic acid and alkali.
Packing: in net 25kg bags lined with two layered polyethylene plastic pouches. Should be stored in an aeration----drying storehouse. Preserved from damp air. Move carefully during loading and unloading avoiding breakage.

Hazardous details:  
UN No.: 2853
Class: 6.1
Packing: III

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