SODIUM SILICATE

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Introduction

Sodium silicate is the common name for compounds with the formula Na2(SiO2)nO. A well known member of this series is sodium metasilicate, Na2SiO3. Also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form. The pure compositions are colourless or white, but commercial samples are often greenish or blue owing to the presence of iron-containing impurities.

Specifications

Sr. No Product Group Specification
1 Sodium Silicate Glass
Alkaline Grade
Wt. Ratio of Na2O : SiO2 1:1.7 to 2.8
Total Soluble Solids 99% min
Na2O 26 to 34%
SiO2 65 to 73%
2 Sodium Silicate Liquid
Alkaline Grade
Wt. Ratio of Na2O : SiO2 1:1.7 to 2.8
Specific Gravity 38 to 60º Be
Total Soluble Solids 34 to 55%
Na2O 9 to 18%
SiO2 25 to 37%
3 Sodium Silicate Glass
Neutral Grade
Wt. Ratio of Na2O : SiO2 1:2.9 to 3.3
Total Soluble Solids 98.5% min
Na2O 23 to 25%
SiO2 73 to 76%
4 Sodium Silicate Liquid
Neutral Grade
Wt. Ratio of Na2O : SiO2 1:2.9 to 3.3
Specific Gravity 20 to 42º Be
Total Soluble Solids 18 to 39%
Na2O 4 to 10%
SiO2 12 to 30%

Uses

They are used in cements, passive fire protection, textile and lumber processing, refractories, and automobiles. Sodium carbonate and silicon dioxide react when molten to form sodium silicate and carbon dioxide