Overview
Sodium silicate solution is an inorganic compound produced by fusing sand (silica) with sodium carbonate at high temperatures, then dissolving the resulting glass in water under pressure. This versatile liquid has been industrially important since the 19th century, particularly for its adhesive and binding properties. As a colloidal solution of silica particles, it exhibits unique characteristics that make it valuable across multiple industries. The commercial product typically contains 35-50% solids by weight, with the exact properties determined by the SiO2:Na2O weight ratio (modulus), which commonly ranges from 2.0 to 3.3.
Physical and Chemical Properties
The solution appears as a colorless to slightly cloudy viscous liquid with a slippery feel, reflecting its soap-like qualities. Its viscosity decreases significantly with temperature increases, a critical factor for industrial pumping and handling. The pH typically ranges from 11 to 13, making it strongly alkaline. When exposed to atmospheric CO2, sodium silicate gradually carbonates, forming silica gel and sodium carbonate. This property makes it useful as a chemical binder. Upon drying, it forms a hard, glassy film that is water-resistant unless exposed to highly alkaline conditions. The solution demonstrates excellent thermal stability up to its boiling point.
Main Applications
In the detergent industry, sodium silicate solution serves as a builder that enhances cleaning efficiency, prevents corrosion, and provides alkalinity. It constitutes 5-15% of powdered laundry detergent formulations. The construction sector utilizes it as an additive in cement and concrete to improve strength and reduce porosity. Foundries employ it as a binder for sand molds in metal casting processes, where it hardens upon exposure to CO2 gas. Other significant uses include paper coating, textile processing, water treatment (as a coagulant aid), and fireproofing applications for wood and fabrics. Emerging applications include use in lithium-ion battery anodes and as a precursor for silica-based nanomaterials.
Safety and Storage
As an alkaline material, sodium silicate solution requires careful handling to prevent skin and eye irritation. Workers should wear chemical-resistant gloves, goggles, and protective clothing. Spills should be contained and neutralized with weak acid before cleanup. The solution should be stored in polyethylene, rubber-lined steel, or stainless steel containers to prevent corrosion. Storage areas should be well-ventilated and protected from freezing, as the solution may gel or precipitate below 0°C (though it typically redissolves upon warming). Containers must be kept tightly sealed to prevent carbonation and evaporation, which can alter the solution's properties.
B2B Procurement Guide
Industrial buyers should specify key parameters including the SiO2:Na2O ratio (modulus), solids content, viscosity, and iron content (for applications requiring low coloration). Common industry standards include ASTM D98-05 for construction uses or customer-specific technical specifications. Bulk procurement typically occurs in isotanks (20-25 metric tons) or drums (200-250 kg). For large-scale users, on-site storage tanks with agitation systems may be recommended to prevent settling. Lead times vary by region but generally allow for 1-2 weeks for domestic shipments. Quality certificates should include analysis of modulus, density, viscosity, and solids content, along with batch traceability information.
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