The classification of the sodium silicate is introduced:

1. Sodium silicate is divided into two kinds, one kind of sodium metasilicate, chemical formula Na2SiO3, formula weight of 122.00. Disodium silicate sodium metasilicate alias "three oxygen", the CAS no. : 6834-92-0.

Another positive sodium silicate (sodium silicate), chemical formula Na4SiO4, relative molecular mass of 184.04.

2. Sodium silicate is colorless crystals, melting point 1291 k (1088 ℃), rare. Hydrolysis of sodium silicate solution for alkaline (a little stronger than soda ash). Because of weak acid salt is so in hydrochloric acid, sulfuric acid, nitric acid, carbon dioxide can precipitate silicate. Preservation should be close to prevent carbon dioxide into and rubber plug should be used to prevent sticking ground glass stopper. Frequently used industrial soda ash and quartz eutectic preparing Na2CO3 + SiO2 to write Na2SiO3 + CO2, products containing ferrous salt often with pale blue green. Used for inorganic bonding agents (share) mixed with talcum powder and so on, soap filler, modulation, acid-resistant concrete after joining the pigment can be used as exterior wall coating, poured into ancient buildings foundation soil soil solid case collapsed.

3. Sodium metasilicate is common paohuajian with caustic soda water thermal low molecular crystals, made by commodity presence of water, five and nine hydrate, only nine of hydrate exist on the market in our country, in the 1980 s is an urgent need to sodium metasilicate and hasty development emergency product technology content is low, only 42 ℃ for its melting point, easily when they are stored into liquid or cream, are being phased out gradually, but due to some user habits and some areas of crystallization water is not very care about, nine sodium metasilicate water still has certain market.