Product classification
HS code for Calcined dolomite: 2518.20
Dolomite, calcined or sintered, including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape.
Classification of calcined dolomite under HS 2518.20
Calcined dolomite is classified under HS code 251820, which specifically describes "Dolomite, calcined or sintered; including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape." This classification is critical because it distinguishes dolomite that has undergone a significant thermal treatment process (calcination or sintering) from raw, uncalcined dolomite. Calcination involves heating dolomite to high temperatures, which removes carbon dioxide and alters its chemical and physical properties, making it suitable for specialized industrial applications such as refractories, flux in metallurgy, and agricultural soil amendments. The inclusion of roughly trimmed or cut blocks further refines the scope of this code.
- Covers
- Calcined dolomite lumps
- Calcined dolomite powder
- Sintered dolomite
- Dead-burned dolomite
- Dolomite blocks or slabs, merely cut, that have been calcined
- Also under 2518.20
- RHI Magnesita Dolime
- Vesuvius Refractories Dolime
- Lhoist Dolime
- Carmeuse Dolime
Codes often confused with 2518.20
Common mistake. The most common misclassification for calcined dolomite is with raw, uncalcined dolomite, which falls under HS code 251810, covering "Dolomite, not calcined or sintered." The key distinction lies in the calcination process: 251820 applies only to dolomite that has been heat-treated to alter its chemical composition, while 251810 is for the mineral in its natural state. Incorrectly classifying based on the presence or absence of this thermal processing can lead to significant customs errors. Another potential confusion could arise with HS code 252100, which covers "Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement." While dolomite is a calcareous stone, 252100 is specifically for limestone, not dolomite, and does not account for the calcination process. Furthermore, highly processed articles made from calcined dolomite, such as refractory bricks, would be classified under Chapter 68 or 69, not under 251820, which is for the bulk material.
Top exporters and importers of HS 251820 (the code used for calcined dolomite), 2025
In 2025, the largest exporter of HS 251820 (the code used for calcined dolomite) in UN Comtrade data was Belgium, with 42% of world exports; the largest importer in UN Comtrade data was the Netherlands, with 16% of world imports. Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 47% of its exports here ($8.9M, CEPII BACI), so it may also belong among the top exporters.
Figures cover everything classified under HS 251820, not only calcined dolomite.
Top exporters 2025 · share of world exports
- 1 Belgium $65M 42% of world exports
- 2 United States $14M 9.1% of world exports
- 3 Italy $12M 8.1% of world exports
Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 47% of its exports here ($8.9M, CEPII BACI), so it may also belong among the top exporters.
World total: $154M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Netherlands $28M 16% of world imports
- 2 Sweden $24M 14% of world imports
- 3 Japan $14M 7.9% of world imports
World total: $175M 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 calcined dolomite
Brazil classifies calcined dolomite under NCM 2518.20.00: HS 2518.20 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about calcined dolomite
What is the HS code for Calcined dolomite?
The HS code for Calcined dolomite is 251820 (Dolomite, calcined or sintered; including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape). The HS code for Calcined dolomite is 251820. This code specifically covers dolomite that has undergone calcination or sintering, distinguishing it from raw dolomite due to its altered chemical and physical properties.
How do I classify Calcined dolomite for customs?
Calcined dolomite is classified under HS code 251820 — Dolomite, calcined or sintered; including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape. This is a 6-digit subheading level code.
How does calcined dolomite differ from raw dolomite for classification purposes?
Calcined dolomite (251820) has been heat-treated to remove carbon dioxide, changing its chemical composition and properties. Raw dolomite (251810) has not undergone this process and remains in its natural mineral state. This thermal treatment is the defining factor for classification.
Which countries are the top exporters of calcined dolomite (HS 251820)?
In 2025, the top exporters of HS 251820 (the code used for calcined dolomite) in UN Comtrade data were Belgium ($65M, 42% of world exports), the United States ($14M) and Italy ($12M). World exports came to about $154M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 47% of its exports here ($8.9M, CEPII BACI), so it may also belong among the top exporters.
Which countries are the top importers of calcined dolomite (HS 251820)?
In 2025, the top importers of HS 251820 (the code used for calcined dolomite) in UN Comtrade data were the Netherlands ($28M, 16% of world imports), Sweden ($24M) and Japan ($14M). World imports came to about $175M, 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 Calcined dolomite the same in all countries?
The base HS code 251820 for Calcined dolomite 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 calcined dolomite in Brazil?
In Brazil, calcined dolomite (HS 251820) is classified under NCM 2518.20.00.