HS code · 6-digit subheading
HS Code 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
HS code 6815.91 is the 6-digit subheading for 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. It is used for magnesia bricks (unfired), dolomite refractory blocks, chromite-magnesia ramming mixes, periclase-carbon refractory shapes and dolime linings.
What HS 6815.91 covers
This category encompasses articles made from specific mineral substances like magnesite, magnesia (periclase), dolomite (dolime), or chromite, which are not ceramic. These materials are highly valued for their exceptional refractory properties, meaning they can withstand extremely high temperatures without degrading. They are crucial components in the construction of industrial furnaces, kilns, and other high-temperature processing equipment, particularly in the steel, cement, glass, and non-ferrous metals industries. Importers are typically heavy industrial nations requiring durable linings for their manufacturing processes. Exporters are countries possessing these mineral resources or advanced manufacturing capabilities to process them into specialized articles. Key aspects include the material's resistance to thermal shock, chemical attack, and mechanical wear in harsh environments, making them indispensable for modern industrial production.
- Covers
- Magnesia bricks (unfired)
- Dolomite refractory blocks
- Chromite-magnesia ramming mixes
- Periclase-carbon refractory shapes
- Dolime linings
- Magnesia-spinel articles
- Examples
- RHI Magnesita refractory bricks (unfired)
- Vesuvius refractory masses
- Magnezit Group products
- Calderys monolithic refractories
Codes often confused with 6815.91
Common mistake. Often confused with refractory ceramic goods in 6902 or 6903, but 681591 specifically covers non-ceramic articles, often bonded without firing or with different bonding agents.
Top exporters and importers of HS code 681591, 2025
In 2025, the largest exporter of HS code 681591 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.
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 6815.91 2
Brazil splits HS 6815.91 into 2 NCM codes, Mercosur's 8-digit tariff lines.
- 6815.91.10 Unfired bonded magnesite/dolomite/chromite itemsCrus, aglomerados com aglutinante químico
- 6815.91.90 Other magnesite, dolomite or chromite articlesOutras
All Brazil NCM codes in heading 68.15 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 6815.91
What is HS code 681591?
HS code 681591 is a 6-digit subheading in the Harmonized System that covers: 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 category encompasses articles made from specific mineral substances like magnesite, magnesia (periclase), dolomite (dolime), or chromite, which are not ceramic. These materials are highly valued for their exceptional refractory properties, meaning they can withstand extremely high temperatures without degrading. They are crucial components in the construction of industrial furnaces, kilns, and other high-temperature processing equipment, particularly in the steel, cement, glass, and non-ferrous metals industries. Importers are typically heavy industrial nations requiring durable linings for their manufacturing processes. Exporters are countries possessing these mineral resources or advanced manufacturing capabilities to process them into specialized articles. Key aspects include the material's resistance to thermal shock, chemical attack, and mechanical wear in harsh environments, making them indispensable for modern industrial production.
What products fall under HS code 681591?
Magnesia bricks (unfired), Dolomite refractory blocks, Chromite-magnesia ramming mixes, Periclase-carbon refractory shapes, Dolime linings, Magnesia-spinel articles
What are common misclassifications for HS code 681591?
Often confused with refractory ceramic goods in 6902 or 6903, but 681591 specifically covers non-ceramic articles, often bonded without firing or with different bonding agents.
Which countries are the top exporters of goods under HS code 681591?
In 2025, the top exporters of HS code 681591 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 goods under HS code 681591?
In 2025, the top importers of HS code 681591 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.
How is HS code 681591 structured?
HS code 681591 is a 6-digit subheading under the Harmonized System. The first 2 digits (68) identify the chapter, digits 3-4 (15) identify the heading, and digits 5-6 (91) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 681591?
Brazil splits HS code 681591 into 2 NCM codes: 6815.91.10 (Unfired bonded magnesite/dolomite/chromite items), 6815.91.90 (Other magnesite, dolomite or chromite articles). The first 6 digits of each match the HS code.