Magnesium Fluorosilicate

Another name : magnesium silicofluoride
(Molecular)Formula: MgSiF₆.6H₂O
(Molecular)Weight: 274.48
UN.NO: 2853
HAZARD CLASS : 6.1
H.S.CODE: 2826.9000
Physical chemistry properties: Clear or white,rhombohedral or acicular crystal.Odourless.The relative density is 1.788.The melting point is 120°C(decomposition).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 at the same time gives out silicon tetrachloride gas.It dissolves easilyu in water,also in dilute acids,but hardly dissolves 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.Poisonous!
Introduction: Mainly used as a water----repellent and a hardener to improve the hardness and intensity of concrete.Otherwise,it is applied in surface fluor efflorescence----proofing for constructions made of ganister bricks,the manufacturer of ceramics,insect prevention for fabrics,and also used as a pesticide.
Quality standard:

Package ,storage and transportation: Packed in braided bags lined with two layered polythylene plastic pouches.The net weight per bag is 25kg.Should be stored in an aeration----drying storehouse.Preserved from damp air.Move carefully during loading and unloading avoiding breakage.