HS Code for Calcium sulphite

Calcium sulphite is classified under HS code 2832.20, which covers sulphites other than those of sodium. This classification falls under Chapter 28 (inorganic chemicals), specifically heading 2832, which is dedicated to sulphites and thiosulphates. The structure of heading 2832 separates sodium sulphites (2832.10) from all other sulphites (2832.20). Calcium sulphite, with the chemical formula CaSO3, is an inorganic salt produced by the reaction of sulfur dioxide with calcium hydroxide. It is commonly used as a food preservative (E226) and in the desulfurization of flue gases. The classification is straightforward under GRI 1, as the product is a distinct inorganic salt of sulfurous acid. It must not be confused with sulphates, which contain more oxygen and are classified under a different heading. The product must be a separate chemically defined compound to remain in this heading; if it is mixed with other materials for specific retail functions, other chapters might apply.

Products Included

• Calcium sulphite powder (Food Grade E226)
• Technical grade calcium sulphite for industrial scrubbing
• Calcium sulphite hemihydrate
• Calcium sulphite used as a dechlorinating agent

Common Misclassification

The most frequent misclassification is with calcium sulphate (gypsum or anhydrite), which is classified under HS code 2833.29. Sulphites (2832) and sulphates (2833) are chemically distinct based on the oxidation state of the sulfur atom. Another common error is using 2832.10, which is strictly for sodium sulphites. Importers must verify the chemical name and formula to ensure the correct salt is identified.

FAQ

What is the HS code for calcium sulphite?

The HS code for calcium sulphite is 2832.20, which is the category for other sulphites.

Is calcium sulphite the same as calcium sulfate?

No, calcium sulphite (CaSO3) is classified under 2832.20, while calcium sulfate (CaSO4) is classified under 2833.29. They have different chemical properties and industrial uses.