Overview
Sodium silicate, or water glass, is an inorganic compound composed of sodium oxide (Na2O) and silicon dioxide (SiO2). It is widely used in industries due to its adhesive and binding properties. The compound is typically produced by fusing silica sand with sodium carbonate at high temperatures, resulting in a glassy solid or viscous aqueous solution. In its liquid form, sodium silicate appears as a colorless or slightly cloudy fluid. Its versatility stems from its ability to form gels or solid binders when exposed to acids or heat, making it indispensable in construction, manufacturing, and cleaning products.
Physical and Chemical Properties
Sodium silicate exhibits high alkalinity (pH 11–12.5) and is hygroscopic, absorbing moisture from the air. Its viscosity and density vary with the SiO2/Na2O ratio, known as the modulus. A higher modulus increases viscosity and thermal stability but reduces solubility. The compound reacts with acids to form silica gel, a process utilized in waterproofing and catalysis. It also demonstrates fire-resistant properties, often used as a flame retardant in wood and fabric treatments. Despite its solubility in water, it is incompatible with alcohols and organic solvents, which may cause precipitation.
Main Applications
The detergent industry relies on sodium silicate as a corrosion inhibitor and surfactant booster. In construction, it acts as a binder for cement and refractory materials, improving durability and heat resistance. Foundries use it for sand casting molds due to its quick-setting properties. Other applications include textile processing (fabric stiffening), paper coating, and automotive repair adhesives. Recent innovations explore its role in carbon capture and battery materials, highlighting its potential in sustainable technologies.
Safety and Storage
Sodium silicate is corrosive and can cause skin burns or eye damage. Always wear gloves, goggles, and protective clothing when handling. Ensure adequate ventilation to avoid inhalation of aerosols. Store in polyethylene or coated steel containers to prevent corrosion. Avoid exposure to acids, which can trigger rapid gelation. Shelf life is typically 6–12 months in sealed containers; crystallization may occur but can be reversed by gentle heating.
B2B Procurement Guide
Industrial buyers should prioritize modulus (typically 2.0–3.5) and concentration (often 35–50% solids). Bulk shipments in tanker trucks or IBC totes are cost-effective for large-scale users. Verify supplier compliance with ISO or regional chemical safety standards. For niche applications (e.g., electronics), request low-iron grades to minimize impurities. Sample testing is recommended to confirm viscosity and binding performance. Long-term contracts may secure price stability amid raw material (soda ash) market fluctuations.
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