Product classification
HS code for Dolomite bricks: 6815.91
Stone articles and articles of other mineral substances, containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite.
Classification of dolomite bricks under HS 6815.91
Dolomite bricks are classified under HS code 6815.91. This classification is part of Chapter 68, which covers articles of stone, plaster, cement, asbestos, mica, or similar materials. Specifically, heading 6815 is for articles of stone or other mineral substances not elsewhere specified. Subheading 6815.91 is reserved for articles containing magnesite, magnesia in the form of periclase, dolomite (including in the form of dolime), or chromite. These bricks are typically used in the lining of steel-making furnaces and cement kilns. The classification is driven by the chemical composition of the brick. Unlike ceramic bricks, which are defined by a firing process that creates a vitrified or ceramic bond, dolomite bricks in this category are often chemically bonded or formed from mineral aggregates that do not meet the definition of "ceramics" in Chapter 69.
- Covers
- Magnesia-dolomite refractory bricks
- Resin-bonded dolomite bricks
- Pitch-bonded dolomite bricks
- Tempered dolomite bricks for furnace linings
- Fired dolomite bricks (non-ceramic)
- Also under 6815.91
- RHI Magnesita refractory bricks (unfired)
- Vesuvius refractory masses
- Magnezit Group products
- Calderys monolithic refractories
Codes often confused with 6815.91
Common mistake. The most frequent misclassification occurs with HS code 6902.10, which covers refractory ceramic bricks containing more than 50% of Mg, Ca, or Cr. The distinction lies in whether the product is truly "ceramic." If the brick is made of mineral substances that have not been fired to the point of ceramic vitrification, or if it is resin-bonded, it belongs in 6815.91. Another error is using 2518.10, which is for raw or calcined dolomite; however, once the material is shaped into a brick, it must be classified as an "article" in Chapter 68 or 69.
Top exporters and importers of HS 681591 (the code used for dolomite bricks), 2025
In 2025, the largest exporter of HS 681591 (the code used for dolomite bricks) in UN Comtrade data was China, with 58% of world exports; the largest importer in UN Comtrade data was Germany, with 9.0% 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 681591, not only dolomite bricks.
Top exporters 2025 · share of world exports
- 1 China $454M 58% of world exports
- 2 Austria $94M 12% of world exports
- 3 Spain $50M 6.3% of world exports
World total: $781M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $69M 9.0% of world imports
- 2 Italy $68M 8.8% of world imports
- 3 Japan $60M 7.8% of world imports
World total: $768M 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 dolomite bricks
Brazil splits HS 6815.91 into 2 NCM codes. Pick the one that matches your product:
- 6815.91.10Unfired bonded magnesite/dolomite/chromite items
- 6815.91.90Other magnesite, dolomite or chromite articles
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about dolomite bricks
What is the HS code for Dolomite bricks?
The HS code for Dolomite bricks is 681591 (Stone articles and articles of other mineral substances; containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite). The HS code for dolomite-based bricks, particularly those used for refractory purposes but not classified as ceramics, is 6815.91.
How do I classify Dolomite bricks for customs?
Dolomite bricks is classified under HS code 681591 — Stone articles and articles of other mineral substances; containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite. This is a 6-digit subheading level code.
Are all refractory bricks classified here?
No, only those containing dolomite, magnesite, or chromite that are not considered ceramic. Most standard refractory bricks are classified in heading 6902.
Which countries are the top exporters of dolomite bricks (HS 681591)?
In 2025, the top exporters of HS 681591 (the code used for dolomite bricks) in UN Comtrade data were China ($454M, 58% of world exports), Austria ($94M) and Spain ($50M). World exports came to about $781M, 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 dolomite bricks (HS 681591)?
In 2025, the top importers of HS 681591 (the code used for dolomite bricks) in UN Comtrade data were Germany ($69M, 9.0% of world imports), Italy ($68M) and Japan ($60M). World imports came to about $768M, 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 Dolomite bricks the same in all countries?
The base HS code 681591 for Dolomite bricks 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 dolomite bricks in Brazil?
Brazil splits HS 681591 into 2 NCM codes, so the right one for dolomite bricks depends on the product's details: 6815.91.10 (Unfired bonded magnesite/dolomite/chromite items), 6815.91.90 (Other magnesite, dolomite or chromite articles).