Product classification

HS code for Anhydrite: 2520.10

Gypsum, anhydrite.

Classification of anhydrite under HS 2520.10

Anhydrite is classified under HS code 2520.10, located within Chapter 25, which covers salt, sulfur, earths, and stone, as well as plastering materials, lime, and cement. Heading 2520 specifically encompasses gypsum, anhydrite, and plasters. The subheading 2520.10 covers both gypsum and anhydrite in their natural, unworked state. Anhydrite is a mineral composed of anhydrous calcium sulfate (CaSO4), distinguishing it from gypsum, which is hydrous calcium sulfate. In the context of international trade, this code applies to the mineral as it is extracted from the earth, including when it has been crushed, ground, or powdered, provided it has not been calcined or further processed into plaster. Its classification is based on its chemical composition as a naturally occurring mineral sulfate and its status as a raw material for the construction and chemical industries. It is frequently used as a soil conditioner or as a setting retarder in Portland cement.

Covers
  • Natural anhydrite mineral
  • Crushed anhydrite rock
  • Powdered natural calcium sulfate (anhydrous)
  • Lump anhydrite for industrial use
Also under 2520.10
  • USG Corporation Gypsum
  • Saint-Gobain Gypsum
  • Knauf Gypsum
  • National Gypsum

Codes often confused with 2520.10

Common mistake. Anhydrite is often confused with 2520.20, which is the code for plasters (calcined gypsum or anhydrite). It can also be misclassified under 2833.29, which covers chemical-grade sulfates. However, if the product is a naturally occurring mineral, Chapter 25 is the correct location rather than the chemical chapter.

2520.20Plasters; (consisting of calcined gypsum or calcium sulphate), whether or not coloured, with or without small quantities of accelerators or retarders2833.29Sulphates; n.e.c. in item no. 2833.2

Top exporters and importers of HS 252010 (the code used for anhydrite), 2025

In 2025, the largest exporter of HS 252010 (the code used for anhydrite) in UN Comtrade data was Oman, with 23% of world exports; the largest importer in UN Comtrade data was the United States, with 13% 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 252010, not only anhydrite.

Top exporters 2025 · share of world exports

  1. 1 Oman $190M
  2. 2 Spain $142M
  3. 3 Thailand $108M

World total: $833M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 United States $166M
  2. 2 India $150M
  3. 3 Japan $83M

World total: $1.3B 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 codes for anhydrite

Brazil splits HS 2520.10 into 3 NCM codes. Pick the one that matches your product:

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about anhydrite

What is the HS code for Anhydrite?

The HS code for Anhydrite is 252010 (Gypsum; anhydrite). Natural anhydrite is classified under HS code 2520.10, which it shares with natural gypsum.

How do I classify Anhydrite for customs?

Anhydrite is classified under HS code 252010 — Gypsum; anhydrite. This is a 6-digit subheading level code.

Is synthetic anhydrite classified here?

No, synthetic calcium sulfate produced as a byproduct of chemical processes is generally classified under HS code 2833.29 rather than the mineral code 2520.10.

Which countries are the top exporters of anhydrite (HS 252010)?

In 2025, the top exporters of HS 252010 (the code used for anhydrite) in UN Comtrade data were Oman ($190M, 23% of world exports), Spain ($142M) and Thailand ($108M). World exports came to about $833M, 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 anhydrite (HS 252010)?

In 2025, the top importers of HS 252010 (the code used for anhydrite) in UN Comtrade data were the United States ($166M, 13% of world imports), India ($150M) and Japan ($83M). World imports came to about $1.3B, 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 Anhydrite the same in all countries?

The base HS code 252010 for Anhydrite 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 anhydrite in Brazil?

Brazil splits HS 252010 into 3 NCM codes, so the right one for anhydrite depends on the product's details: 2520.10.11 (Gypsum in irregular lumps (rock gypsum)), 2520.10.19 (Other gypsum), 2520.10.20 (Anhydrite).