Water glass, also known as sodium silicate solution, is a colorless and transparent inorganic substance composed of sodium silicate and water. Water glass readily absorbs moisture and forms a solid in dry air, which can be used in a variety of industrial and everyday applications. It has excellent properties such as water resistance, acid and alkali resistance, and impermeability, and is widely used in construction, waterproofing, bonding, and mineral impregnation. At the same time, water glass can also be used to produce fertilizers, fireproof materials, pulp and ceramics.
Detection performance
The following are common performance parameters of water glass and their brief descriptions:
| performance parameter | A brief description |
|---|---|
| Solid content | The content of sodium silicate in the solution |
| Relative density | The ratio of the density of the solution to the density of water |
| pH value | pH of water glass solution |
| viscosity | The viscosity of the solution has an important influence on the application of coating, impregnation, etc. |
| Permeability | Permeation resistance of water glass coated or impregnated substrates to moisture and gases |
| water retention | The water absorption of the substrate after coating or impregnation, reflecting the water retention performance after coating or impregnation |
| Sulfate content | The content of sulfate in water glass solution has an important influence on the use effect in specific application scenarios |
| Chloride content | The content of chloride in water glass solution has limited requirements for some specific applications |
Detection method
The following is a brief description of the test methods for common performance parameters of water glass:
Solid content: heat the water glass sample to about 105°C and dry it to constant weight, and calculate the ratio of the mass of non-volatile substances to the mass of the total sample.
Relative density: Add the water glass solution into the density meter, measure the density of the solution, and calculate the relative density.
pH value: Use pH meter and other equipment to measure the pH of the water glass solution to evaluate its stability and application effect.
Viscosity: Using viscometer and other equipment to measure the viscosity of water glass solution has an important impact on coating and impregnation in specific application scenarios.
Permeation resistance: Use gas permeatIon Meter, water immersion Tester and other equipment to evaluate the water glass coating or impregnated substrate's resistance to moisture and gas penetration.
Water retention: Use weighing method and other equipment to measure the water absorption of the substrate after water glass coating or impregnation, reflecting the water retention performance of the coating or impregnation.
Sulfate content: Use a Spectrophotometer and other equipment to measure the sulfate content in the water glass solution.
Chloride content: Measure the chloride content in the water glass solution using a device such as a chloride ion selective electrode.
NBCHAO reminds you: Different performance parameters may require different testing methods and equipment, and there may be some industry standards and specifications. For the performance testing of water glass, the corresponding testing methods and standards should be selected according to actual needs. At the same time, strict control of test conditions and standardized operations are required during the experiment to ensure the accuracy and reliability of the test.
