Specification :

Sodium silicate is a white powder that is readily soluble in water, producing an alkaline solution. It is one of a number of related compounds which include sodium orthosilicate, Na4SiO4, sodium pyrosilicate, Na6Si2O7, and others. All are glassy, colourless and dissolve in water.

Sodium silicate is stable in neutral and alkaline solutions. In acidic solutions, the silicate ion reacts with hydrogen ions to form silicic acid, which when heated and roasted forms silica gel, a hard, glassy substance.

[ edit] CAS registry number and EINECS numberEach and every substance has its own unique CAS registry number and EINECS number. The CAS No. and EINECS No. of sodium silicate and other related substances are: [ 4]

Substance Name CAS# EC# ( EINECS No.)
Silicic acid, sodium salt 1344-09-8 239-981-7
disodium metasilicate 6834-92-0 229-912-9
Sodium silicate 15859-24-2 215-687-4