Overview
3.4 modulus sodium silicate solution is an alkaline liquid compound with a SiO2-to-Na2O molar ratio of approximately 3.4:1. This specific ratio offers optimal viscosity and reactivity for industrial applications. Produced by fusing sand (silica) with soda ash at high temperatures, the resulting solid is dissolved in water under pressure to create the liquid solution. As a cost-effective inorganic chemical, it serves multiple industries due to its binding, adhesive, and pH-adjusting properties. The 3.4 modulus variant is particularly valued in construction and manufacturing for its balanced solubility and gelation characteristics.
Physical and Chemical Properties
This sodium silicate solution appears as a clear, slightly viscous liquid with a density typically ranging from 1.35 to 1.50 g/cm³, depending on concentration. Its high alkalinity (pH 11-13) gives it corrosive properties, requiring careful handling. The solution exhibits excellent thermal stability up to its boiling point, where water evaporation occurs. Key chemical behaviors include reaction with acids to form silica gel, and compatibility with most inorganic salts. Unlike organic binders, it is non-flammable and contributes to fire resistance in treated materials. The 3.4 modulus provides intermediate viscosity – higher than lower-modulus grades but more soluble than 4.0+ modulus products.
Main Applications
In detergents and soaps, 3.4 modulus sodium silicate acts as a buffer, corrosion inhibitor, and suspension aid. The construction industry utilizes it for concrete hardening acceleration and as a component in acid-resistant cements. Foundries employ it as a binder for sand molds due to its thermal stability and ability to form strong bonds when dehydrated. Additional uses include paper coating, textile processing, and water treatment where it aids in particle aggregation. Some specialty applications involve refractory ceramics and passive fire protection systems. The modulus 3.4 version is often preferred for adhesive formulations where a balance between working time and final strength is required.
Safety and Storage
As a strongly alkaline material, sodium silicate solution requires PPE including gloves, goggles, and protective clothing. Spills should be neutralized with weak acids (e.g., vinegar) and rinsed with copious water. Inhalation of mists should be avoided through proper ventilation or respiratory protection. Storage recommendations include sealed HDPE or stainless steel containers to prevent carbonation (which reduces effectiveness). While not flammable, containers should be kept from freezing as crystallization may occur below -2°C. Shelf life is typically 12 months when stored properly, though viscosity may increase gradually over time.
B2B Procurement Guide
Industrial buyers should specify the exact modulus (3.4 ±0.1) and solid content (typically 36-42%) when ordering. Bulk shipments via tank trucks or isotanks often provide the best economics for large-volume users, while 200kg drums suit smaller operations. Quality certifications like ISO 9001 and chemical composition analysis reports should be requested from suppliers. Regional pricing varies significantly based on transportation costs and local production capacity. Southeast Asian suppliers may offer competitive pricing for export markets, while local producers reduce logistics risks. Just-in-time delivery is advisable for users without temperature-controlled storage facilities.
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