Product classification
HS code for Calcium sulphite: 2832.20
Sulphites, other than of sodium.
Classification of calcium sulphite under HS 2832.20
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.
- Covers
- Calcium sulphite powder (Food Grade E226)
- Technical grade calcium sulphite for industrial scrubbing
- Calcium sulphite hemihydrate
- Calcium sulphite used as a dechlorinating agent
- Also under 2832.20
- Merck Potassium Sulphite
- Sigma-Aldrich Calcium Sulphite
- Alfa Aesar Magnesium Sulphite
- Spectrum Chemical Ammonium Sulphite
Codes often confused with 2832.20
Common mistake. 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.
Top exporters and importers of HS 283220 (the code used for calcium sulphite), 2025
In 2025, the largest exporter of HS 283220 (the code used for calcium sulphite) in UN Comtrade data was the United States, with 29% of world exports; the largest importer in UN Comtrade data was France, with 21% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 283220, not only calcium sulphite.
Top exporters 2025 · share of world exports
- 1 United States $11M 29% of world exports
- 2 India $7.1M 18% of world exports
- 3 United Kingdom $4.5M 12% of world exports
World total: $38M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 France $18M 21% of world imports
- 2 Mexico $7.4M 8.5% of world imports
- 3 Spain $7.2M 8.3% of world imports
World total: $87M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for calcium sulphite
Brazil classifies calcium sulphite under NCM 2832.20.00: HS 2832.20 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about calcium sulphite
What is the HS code for Calcium sulphite?
The HS code for Calcium sulphite is 283220 (Sulphites; other than of sodium). The HS code for calcium sulphite is 2832.20, which is the category for other sulphites.
How do I classify Calcium sulphite for customs?
Calcium sulphite is classified under HS code 283220 — Sulphites; other than of sodium. This is a 6-digit subheading level code.
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.
Which countries are the top exporters of calcium sulphite (HS 283220)?
In 2025, the top exporters of HS 283220 (the code used for calcium sulphite) in UN Comtrade data were the United States ($11M, 29% of world exports), India ($7.1M) and the United Kingdom ($4.5M). World exports came to about $38M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of calcium sulphite (HS 283220)?
In 2025, the top importers of HS 283220 (the code used for calcium sulphite) in UN Comtrade data were France ($18M, 21% of world imports), Mexico ($7.4M) and Spain ($7.2M). World imports came to about $87M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Calcium sulphite the same in all countries?
The base HS code 283220 for Calcium sulphite is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for calcium sulphite in Brazil?
In Brazil, calcium sulphite (HS 283220) is classified under NCM 2832.20.00.