HS Code for Sodium silicate

Sodium silicate is classified under HS code 2839.19. This classification is part of Chapter 28, which encompasses inorganic chemicals, precious metal compounds, and radioactive elements. Specifically, heading 2839 is designated for silicates and commercial alkali metal silicates. Within this heading, the code 2839.11 is reserved for sodium metasilicates, which have a specific molar ratio. Consequently, 2839.19 serves as the residual category for all other forms of sodium silicates, including those with varying silica-to-sodium oxide ratios. The classification is determined by the chemical composition and the fact that it is an inorganic salt of silica. These compounds are typically produced by melting high-purity sand with soda ash in a furnace or through a hydrothermal process involving caustic soda and silica. The resulting products, often referred to as water glass, are essential in industrial applications such as detergents, adhesives, soil stabilization, and water treatment. The versatility of sodium silicate in liquid and powder forms necessitates a clear distinction from other metal silicates like potassium silicate, which falls under 2839.90. The classification remains consistent regardless of the concentration of the aqueous solution, provided the substance is not mixed with other ingredients to form a prepared binder.

Products Included

• Liquid sodium silicate (water glass)
• Sodium orthosilicate
• Sodium sesquisilicate
• Powdered sodium silicate
• Alkaline sodium silicate solutions
• Neutral sodium silicate
• Sodium silicate glass lumps

Common Misclassification

It is frequently confused with HS code 2839.11, which is strictly for sodium metasilicates. Another common error is classifying it under 3824.99, which covers prepared binders for foundry moulds or cores; however, if the product is pure sodium silicate without additives, 2839.19 is the correct code. It should also not be confused with 2505.10 (silica sands) which are the raw materials used in production.

FAQ

What is the HS code for sodium silicate?

The HS code is 2839.19 for most forms, excluding metasilicates.

Is sodium silicate considered hazardous for shipping?

While not classified as a highly toxic substance, it is highly alkaline and can be corrosive to skin and eyes, requiring appropriate safety labeling and handling during international transit.