Sodium silicate is a generic name for chemical compounds with the formula Na2xSiyO2y+x or (Na2O)x·(SiO2)y, such as sodium metasilicate Na2SiO3, sodium orthosilicate Na4SiO4, and sodium pyrosilicate Na6Si 2O7. The anions are often polymeric. These compounds are generally colorless transparent solids or white powders, and soluble in water in various amounts. Sodium silicate is also the technical and common name for a mixture of such compounds, chiefly the metasilicate, also called waterglass, water glass, or liquid glass. The product has a wide variety of uses, including the formulation of cements, passive fire protection, textile and lumber processing, manufacture of refractory ceramics, as adhesives, and in the production of silica gel. The commercial product, available in water solution or in solid form, is often greenish or blue owing to the presence of iron-containing impurities. In industry, the various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio (which can be converted to molar ratio by multiplication with 1.032). The ratio can vary between 1:2 and 3.75:1.[1] Grades with ratio below 2.85:1 are termed alkaline. Those with a higher SiO2:Na2O ratio are described as neutral.
Chemical Abstract Series Number (CAS No) : 1344-09-8
Sodium Silicate Glass
Na2O content (%w/w) : 7.90 - 8.40
SiO2 content (%w/w) : 26.90 - 28.5
Ratio (SiO2/Na2O) : 3.20 - 3.50
Specific Gravity at 27degC (g/ml) : Approx. 1.370
Baume at 27degC (Baume) : Approx. 39.16
Na2O content (%w/w) : Approx. 9.0
SiO2 content (%w/w) : Approx. 29.5
Ratio (SiO2/Na2O) : 3.20 - 3.29
Specific Gravity at 27degC (g/ml) : Approx. 1.41
Baume at 27degC (Baume) : Approx. 42.16
Na2O content (%w/w) : 11.85 - 12.55
SiO2 content (%w/w) : 24.30 - 28.00
Ratio (SiO2/Na2O) : 2.00 - 2.10
Specific Gravity at 27degC (g/ml) : 1.4078 - 1.4356
Baume at 27degC (Baume) : 42.00 - 44.00
Na2O content (%w/w) : 11.25 - 11.75
SiO2 content (%w/w) : 26.00 - 27.00
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.4078 - 1.4216
Baume at 27degC (Baume) : 42.00 - 43.00
Na2O content (%w/w) : 11.75 - 12.40
SiO2 content (%w/w) : 27.50 - 28.50
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.4356 - 1.4500
Baume at 27degC (Baume) : 44.00 - 45.00
Na2O content (%w/w) : 11.75 - 12.80
SiO2 content (%w/w) : 28.70 - 30.40
Ratio (SiO2/Na2O) : 2.30 - 2.50
Specific Gravity at 27degC (g/ml) : 1.4646 - 1,4796
Baume at 27degC (Baume) : 46.00 - 47.00
Na2O content (%w/w) : 12.80 - 14.30
SiO2 content (%w/w) : 29.40 - 32.90
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.4900 - 1.5500
Baume at 27degC (Baume) : 47.68 - 51.45
Na2O content (%w/w) : 13.90 - 14.60
SiO2 content (%w/w) : 32.50 - 33.20
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.5426 - 1.5591
Baume at 27degC (Baume) : 51.00 - 52.00
Na2O content (%w/w) : 14.15 - 15.00
SiO2 content (%w/w) : 32.70 - 34.10
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.5591 - 1.576
Baume at 27degC (Baume) : 52.00 - 53.00
Na2O content (%w/w) : 15.75 - 16.75
SiO2 content (%w/w) : 36.20 - 38.60
Ratio (SiO2/Na2O) : 2.25 - 2.35
Specific Gravity at 27degC (g/ml) : 1.6478 - 1.6860
Baume at 27degC (Baume) : 57.00 - 59.00
Ratio SiO2/Na2O: 2.10 - 2.20 (weight) Ratio SiO2/Na2O: 2.17 - 2.27 (mole)
Na2O (%) : 31.25 - 32.26
SiO2 (%) : 67.74 - 68.75
Soluble Matter (%) : 99.50 min.
Ratio SiO2/Na2O: 2.20 - 2.30 (weight) Ratio SiO2/Na2O: 2.27 - 2.37 (mole) Na2O (%) : 30.30 - 31.25
SiO2 (%) : 68.75 - 69.70
Soluble Matter (%) : 99.50 min.
Ratio SiO2/Na2O: 2.40 - 2.50 (weight) Ratio SiO2/Na2O: 2.48 - 2.58 (mole) Na2O (%) : 28.57 - 29.41
SiO2 (%) : 70.59 - 71.43
Soluble Matter (%) : 99.50 min.
Ratio SiO2/Na2O: 3.10 - 3.30 (weight) Ratio SiO2/Na2O: 3.20 - 3.41 (mole) Na2O (%) : 23.26 - 24.39
SiO2 (%) : 75.61 - 76.74
Soluble Matter (%) : 99.00 min.
Ratio SiO2/Na2O: 3.30 - 3.50 (weight) Ratio SiO2/Na2O: 3.41 - 3.61 (mole) Na2O (%) : 22.22 - 23.26
SiO2 (%) : 76.74 - 77.78
Soluble Matter (%) : 99.00 min.
Ratio SiO2/Na2O: 3.50 - 3.70 (weight) Ratio SiO2/Na2O: 3.61 - 3.82 (mole) Na2O (%) : 21.28 - 22.22
SiO2 (%) : 77.78 - 78.72
Soluble Matter (%) : 98.50 min.
Fe2O3 (%): 0.03 max.
Al2O3 (%): 0.10 max.
TiO2 (%): 0.03 max.
Purity (%): 98.50 min.
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