Characteristics

There are state standard documents:

• for sodium silicate – GOST 13078-81 (download GOST 13078-81 .doc 137KB);

• for potassium silicate – GOST 18958-73 (download GOST 18958-73 .doc 102KB).

The main characteristics of soluble glass:

Parameter	According to GOST 13078- 81	According to GOST 18958-73
Silicate module	2,3 – 3,6	2,5 – 4,0
Density, t=200С, gr/cm3	1,45 – 1,50	1,30 – 1,40
Mass content of silicon dioxide,%	22,7 – 36,7	20,0 – 26,0
Mass content of sodium and potassium oxide, %	7,9 – 13,8	10,2 – 12,5
Mass content of bottom product insoluble in water, %	1,8	1,8

According to state standard GOST 13078-81 soluble glass can be divided in three main types:

1. Low-modulus with silica module of 2,3-2,8;
2. Normal with silica module of 2,8-3,2;
3. High-modulus with silica module of 3,2-3,6.

Sodium silicate with silica module of 2.8-3.0 and density of 1.48gram/cm3 is the most widespread.