HS Code for Potassium silicate

Potassium silicate is classified under HS code 2839.90, which falls within Chapter 28 of the Harmonized System. This chapter is dedicated to inorganic chemicals, including precious metals, rare-earth metals, and radioactive elements. Heading 2839 specifically covers silicates and commercial alkali metal silicates. While sodium silicates are explicitly partitioned into subheadings 2839.11 and 2839.19, potassium silicate is categorized under the "Other" subheading, 2839.90. The classification is determined by the chemical composition of the substance, which consists of varying ratios of silicon dioxide and potassium oxide. These compounds are typically produced by fusing high-purity silica sand with potassium carbonate or potassium hydroxide at high temperatures. The resulting product can be in solid form (glass) or dissolved in water to create a liquid solution. Under the General Rules of Interpretation (GRI) 1 and 6, the specific chemical identity dictates its placement here rather than in prepared chemical mixtures of Chapter 38, provided it is a separate chemically defined compound. The classification remains consistent regardless of whether the product is in anhydrous form or aqueous solution, as long as it maintains its identity as a commercial alkali metal silicate.

Products Included

• Potassium metasilicate
• Potassium orthosilicate
• Aqueous solutions of potassium silicate
• Anhydrous potassium silicate glass
• Liquid potassium water glass

Common Misclassification

Potassium silicate is frequently confused with sodium silicates, which are classified under 2839.11 or 2839.19. Another common error involves classifying prepared binders for foundry molds or anti-corrosive preparations containing potassium silicate under heading 3824. If the product is a simple solution of potassium silicate in water, it must remain in 2839.90. However, if it contains added pigments or other functional additives, it may move to Chapter 32 (paints) or Chapter 38 (miscellaneous chemicals).

FAQ

What is the HS code for potassium silicate?

The HS code for potassium silicate is 2839.90, which covers alkali metal silicates other than those of sodium.

Is potassium silicate classified differently if it is a liquid?

No, both the solid (lump) form and the aqueous solution are classified under 2839.90, provided no other substances have been added to change its essential character.