Slag wool — HTS 6806
Slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69
Chapter 68 › Heading 6806
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 6806 is a broad product category for certain mineral-based insulation and expanded mineral materials. It covers mineral wools such as slag wool and rock wool; exfoliated vermiculite; expanded clay; foamed slag; and similar expanded mineral products. It also covers mixtures and articles made from mineral materials used for heat insulation, sound insulation, or sound absorption, unless another heading specifically applies—particularly heading 6811, heading 6812, or Chapter 69.
To narrow a product from heading 6806 to the correct 8-digit HTSUS code, first identify the product’s principal material and physical form. The subheadings generally distinguish among types of mineral wool, expanded minerals, mixtures, and finished articles. Confirm the product’s composition, whether it is loose, in bulk, or formed into an article, and its intended insulating or acoustic use. The final classification can depend on technical details, so a customs broker or binding-ruling process may be appropriate for uncertain products.
What to check
- Check the exact mineral material, such as rock wool, slag wool, vermiculite, expanded clay, or another expanded mineral.
- Determine whether the item is a raw or loose material, a mixture, or a finished insulating, sound-insulating, or sound-absorbing article.
- Review headings 6811, 6812, and Chapter 69 to make sure a more specific exclusion or classification does not apply.
- Use the product’s technical data sheet, composition, manufacturing process, dimensions, and intended use to compare the HTSUS subheading descriptions.
- Verify the complete 8-digit code in the current official HTSUS and obtain customs-broker or binding-ruling guidance when the material or product form is unclear.
HTS heading 6806 summary
Slag wool is a 4-digit product category containing 3 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 6806.10.00 👉 | Slag wool, rock wool and similar mineral wools (including intermixtures thereof), in bulk, sheets or rolls | 3.9% | Free | 30% |
| 6806.20.00.00 👉 | Exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials (including intermixtures thereof) | Free | — | 30% |
| 6806.90.00 👉 | Other | Free | — | 30% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 6806?
Slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.