Product classification
HS code for Slag wool: 6806.10
Slag wool, rock wool and similar mineral wools (including intermixtures thereof), in bulk, sheets or rolls.
Classification of slag wool under HS 6806.10
Slag wool is classified under HS code 6806.10. This material is a type of mineral wool produced by melting blast furnace slag and other raw materials, then spinning or blowing the melt into fine fibers. It is primarily used for thermal and acoustic insulation. Chapter 68 covers articles of stone, plaster, cement, and similar mineral materials. Heading 6806 specifically includes slag wool, rock wool, and similar mineral wools, even if they are mixed together. These products are often imported in bulk, or as batts, sheets, and rolls. The classification 6806.10 is specific to these mineral wools, distinguishing them from organic insulation materials or glass-based fibers. The essential character of the product is its mineral fiber composition and its intended use as an insulant. Slag wool is valued for its high melting point and fire-resistant properties, making it a staple in industrial and residential fireproofing. The HS code applies regardless of whether the wool is in its raw fibrous state or has been formed into specific shapes like pipe insulation or ceiling tiles.
- Covers
- Slag wool in bulk fibers
- Slag wool insulation batts
- Rock wool and slag wool mixtures
- Mineral wool acoustic ceiling tiles
- Fire-resistant slag wool blankets
- Also under 6806.10
- Rockwool (Roxul)
- Owens Corning Thermafiber
- Knauf Insulation Mineral Wool
- Paroc
- Grodan (horticultural rockwool)
Codes often confused with 6806.10
Common mistake. Slag wool is frequently misclassified under HS code 7019.39, which covers glass wool and articles thereof. While glass wool and slag wool look similar, they are chemically distinct; glass wool is made from silica sand and recycled glass, while slag wool is made from industrial slag. Another common error is using HS code 6806.90, which is for "other" mineral materials like exfoliated vermiculite or expanded clays. Slag wool must be classified under the specific 6806.10 subheading. Additionally, if the slag wool is combined with bitumen or other materials to the point where it becomes a different article (like a roofing felt), it might move to Chapter 48 or 68.07.
Top exporters and importers of HS 680610 (the code used for slag wool), 2025
In 2025, the largest exporter of HS 680610 (the code used for slag wool) in UN Comtrade data was Poland, with 16% of world exports; the largest importer in UN Comtrade data was Germany, with 8.4% 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 680610, not only slag wool.
Top exporters 2025 · share of world exports
- 1 Poland $531M 16% of world exports
- 2 China $442M 14% of world exports
- 3 Germany $290M 9.0% of world exports
World total: $3.2B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $293M 8.4% of world imports
- 2 Italy $245M 7.1% of world imports
- 3 France $178M 5.1% of world imports
World total: $3.5B 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 slag wool
Brazil classifies slag wool under NCM 6806.10.00: HS 6806.10 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about slag wool
What is the HS code for Slag wool?
The HS code for Slag wool is 680610 (Slag wool, rock wool and similar mineral wools (including intermixtures thereof), in bulk, sheets or rolls). Slag wool is classified under HS code 6806.10, which covers slag wool, rock wool, and similar mineral wools.
How do I classify Slag wool for customs?
Slag wool is classified under HS code 680610 — Slag wool, rock wool and similar mineral wools (including intermixtures thereof), in bulk, sheets or rolls. This is a 6-digit subheading level code.
Is slag wool the same as rock wool for customs purposes?
Yes, both slag wool and rock wool are grouped together under the same HS subheading 6806.10 due to their similar mineral fiber nature.
Which countries are the top exporters of slag wool (HS 680610)?
In 2025, the top exporters of HS 680610 (the code used for slag wool) in UN Comtrade data were Poland ($531M, 16% of world exports), China ($442M) and Germany ($290M). World exports came to about $3.2B, 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 slag wool (HS 680610)?
In 2025, the top importers of HS 680610 (the code used for slag wool) in UN Comtrade data were Germany ($293M, 8.4% of world imports), Italy ($245M) and France ($178M). World imports came to about $3.5B, 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 Slag wool the same in all countries?
The base HS code 680610 for Slag wool 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 slag wool in Brazil?
In Brazil, slag wool (HS 680610) is classified under NCM 6806.10.00.