Overview
Sodium silicate solution, colloquially termed water glass, is an inorganic chemical compound produced by fusing silica sand and soda ash at high temperatures. The resulting product is dissolved in water to create viscous, colorless solutions with varying ratios of silica to sodium oxide. This versatile material has been industrially significant since the 19th century, particularly for its binding and adhesive properties. In commercial contexts, water glass is typically classified by its weight ratio (SiO2:Na2O), which determines its chemical behavior and suitability for different applications. Common industrial grades range from 2.0 to 3.3 ratios, with higher silica content generally providing greater thermal stability and adhesive strength.
Physical and Chemical Properties
As an alkaline solution (pH 11-13), sodium silicate demonstrates unique colloidal properties that enable its diverse applications. The liquid exhibits Newtonian flow characteristics at moderate concentrations but can form gels when acidified or exposed to divalent cations. Its viscosity is highly temperature-dependent, with solutions thickening significantly below 20°C. Chemically, water glass undergoes polymerization reactions when dehydrated, forming rigid, glass-like structures. This property makes it invaluable for refractory applications. The material also shows excellent thermal stability up to 1000°C in its anhydrous form, though aqueous solutions begin losing water at approximately 100°C.
Main Applications
The construction industry consumes approximately 40% of global sodium silicate production, primarily for concrete densification and as a binder in acid-resistant cements. In manufacturing, it serves as a core adhesive in cardboard production and foundry mold making. The detergent industry utilizes its alkalinity and deflocculating properties in industrial cleaners. Emerging applications include use as an electrolyte in advanced batteries and as a low-cost binder for silica aerogel production. In wastewater treatment, sodium silicate aids in heavy metal precipitation and sludge dewatering. Its fire-resistant qualities make it a key component in passive fire protection systems.
Safety and Storage
As a strongly alkaline material, sodium silicate requires careful handling to prevent chemical burns. OSHA mandates the use of nitrile gloves, goggles, and face shields when handling concentrated solutions. Spills should be neutralized with weak acids (e.g., vinegar) before water rinsing. Storage tanks should be made of polyethylene or rubber-lined steel to prevent corrosion. Solutions are stable for 6-12 months when kept in sealed containers at 5-30°C. Freezing causes irreversible gelation, while prolonged exposure to CO2 can lead to carbonate precipitation. Bulk transport typically uses isotanks or HDPE drums with proper UN certification.
B2B Procurement Guide
Industrial buyers should specify three critical parameters: SiO2:Na2O ratio (typically 2.0-3.3), Baume density (commonly 35-50°Bé), and iron content (≤0.05% for premium grades). For adhesive applications, viscosity at 20°C (often 200-1000 cP) is crucial. Major Asian producers offer competitive pricing at $300-800/MT FOB for standard grades, with premium low-iron variants commanding 15-20% premiums. Consider regional supply chains - North American buyers often source from PQ Corporation or Occidental Chemical, while Asian markets favor Tokuyama or Qingdao Dongyue. Just-in-time delivery is recommended to prevent gelation in storage.
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