Sodium Silicate Solution[4]
Overview
High transparency 50% sodium silicate solution is a concentrated alkaline liquid with a balanced SiO2/Na2O molar ratio. Known for its glass-like clarity and viscosity, it serves as a cost-effective raw material in multiple industries. The solution derives from fusing sand and soda ash, followed by dissolution in water under pressure. Water glass has been used since the 19th century, originally as a soap additive. Modern production achieves high purity levels (≥99.5%) with minimal iron content, ensuring transparency for applications like optical bonding or decorative coatings where clarity is essential.
Physical and Chemical Properties
This grade exhibits a density of ~1.6 g/cm³ and pH of 11-13, with viscosity adjustable through dilution. The solution polymerizes upon exposure to CO2, forming silica gel—a property exploited in cement hardening and refractory molds. Its alkalinity enables saponification of fats, making it valuable in detergent formulations. Unique to the 50% concentration is its stability against crystallization at room temperature, unlike higher concentrations. The high transparency indicates low metallic impurities (iron <50ppm), critical for optical applications. It demonstrates excellent adhesion to cellulose and mineral surfaces when dried.
Main Applications
In construction, the solution acts as a concrete sealer and accelerator due to its reaction with calcium hydroxide. The textile industry uses it for fireproofing fabrics, while foundries employ it as a sand binder for casting molds. Transparent variants are preferred for paper coating to enhance brightness without coloration. Emerging uses include battery electrode binders for silicon-based anodes, where its adhesive properties improve cycle life. Environmental applications involve heavy metal immobilization in soil remediation. The 50% concentration offers optimal balance between transport efficiency and ease of dilution for end-use processes.
Safety and Storage
As a corrosive alkaline solution, it requires HDPE or stainless steel containers to prevent leakage. Secondary containment is recommended for bulk storage. Workers must wear chemical goggles and acid-resistant gloves; ventilation is necessary to avoid mist inhalation. Shelf life exceeds 12 months if kept sealed to prevent carbonation. Crystallized material can be restored by heating to 50°C with agitation. Spills should be neutralized with weak acids (e.g., vinegar) before rinsing. Compatibility testing is essential when mixing with organic compounds to avoid exothermic reactions.
B2B Procurement Guide
Industrial buyers should specify modulus (SiO2/Na2O ratio), typically 2.0-3.2 for this application. Bulk shipments (IBC totes or tankers) reduce costs by 15-20% compared to drum quantities. Verify certifications like ISO 9001 and REACH compliance for European markets. Sample testing should measure clarity (optical transmission >90%), viscosity (200-500 cP), and impurity levels. Preferred suppliers offer just-in-time delivery to minimize storage duration. Contracts may include technical support for application-specific dilution guidance. Container deposit systems are common for sustainable packaging recovery.
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