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Sodium metasilicate is a kind of salt of silicic acid, which belongs to inorganic salt product. Its molecular formula is Na2SiO3 · nH2O. It is a white powder or crystal particle which is non-toxic, tasteless and pollution-free. It is easy to dissolve in water, not in alcohol and acid. The aqueous solution is alkaline. It is easy to absorb moisture and deliquesce in the air. It has the ability of descaling, emulsifying, dispersing, wetting, permeability and buffering pH value, Sodium metasilicate is a kind of low molecular crystal produced by the hydrothermal reaction of common foamed alkali and caustic soda. The commodity includes anhydrous, five water and nine hydrate. Among them, the nine hydrate only exists in the market of our country. It is a technology urgently developed by sodium metasilicate in 1980s The emergency product with low technical content will release crystal water when its melting point is only 42 ℃ and 30-40 ℃, which brings inconvenience to use. It is easy to change into liquid or paste shape when it is stored, and is being phased out gradually. However, due to some user habits and some fields are not very interested in crystal water, sodium metasilicate jiushui still has a certain market.
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