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Sodium metasilicate

Updated: 2026-08-14

Overview

Sodium Silicate, commonly known as water glass, is an inorganic compound with a wide range of industrial applications. It is produced by fusing sodium carbonate with silica sand at high temperatures. The resulting compound can be found in both solid and liquid forms, with the liquid form being more commonly used in industrial settings due to its ease of handling and dilution. Sodium Silicate is valued for its adhesive and binding properties, making it a key ingredient in detergents, cements, and adhesives. Its alkaline nature also makes it useful in water treatment and textile processing. The compound is non-toxic but requires careful handling due to its corrosive properties.

Physical and Chemical Properties

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Sodium Silicate is a colorless or white solid that can also be dissolved in water to form a viscous liquid. It has a high melting point of 1088°C and a density of 2.4 g/cm³ in its solid form. The compound is highly soluble in water but insoluble in alcohol and most organic solvents. One of the key chemical properties of Sodium Silicate is its high alkalinity, which makes it effective in neutralizing acids and acting as a buffer in various industrial processes. It also exhibits strong adhesive properties, which are exploited in the manufacture of cements and adhesives. Additionally, it is resistant to heat and chemicals, making it suitable for high-temperature applications.

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Main Applications

Sodium Silicate is widely used in the detergent industry as a builder, helping to soften water and improve the efficiency of cleaning agents. It is also a key component in adhesives and cements, where its binding properties are essential for creating strong, durable bonds. In the textile industry, Sodium Silicate is used as a deflocculating agent to prevent the clumping of fibers during processing. It is also employed in water treatment to remove heavy metals and neutralize acidic wastewater. Other applications include its use in fireproofing materials, as a sealant for concrete, and in the production of silica gel.

Safety and Storage

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Sodium Silicate is corrosive and can cause skin and eye irritation upon contact. It is important to handle the compound with care, using gloves and eye protection to avoid exposure. Inhalation of dust or fumes should also be avoided, as it can irritate the respiratory tract. The compound should be stored in a cool, dry place in sealed containers to prevent moisture absorption, which can lead to caking or dilution of the liquid form. Proper labeling and storage away from incompatible materials, such as acids, are essential to ensure safety and maintain product integrity.

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B2B Procurement Guide

When procuring Sodium Silicate, B2B buyers should consider factors such as purity, form (solid or liquid), and supplier certifications. The compound is available in various grades, with industrial-grade being the most common for large-scale applications. Buyers should verify the supplier's ability to meet specifications and provide consistent quality. Price ranges can vary depending on the form and purity, with liquid Sodium Silicate typically being more cost-effective for large-volume purchases. It is also advisable to inquire about packaging options, such as bulk containers or smaller units, to match specific operational needs. Establishing long-term relationships with reputable suppliers can ensure reliable supply and favorable pricing.

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