HTS heading 6806 · Chapter 68
HTS 6806: Slag wool, rock wool and similar mineral wools
HTS heading 6806 covers 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. It has 3 tariff lines with a duty rate; the general (MFN) rates are Free (2 lines), 3.9% (1 line).
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 6806.10.00 | Slag wool, rock wool and similar mineral wools (including intermixtures thereof), in bulk, sheets or rolls | 3.9% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 30% | |
| 6806.10.00.10 | Accoustical pads and boards[m2] | Estimate → | |||
| Other: | |||||
| 6806.10.00.20 | Batts, not exceeding 61 cm in width[m2] | Estimate → | |||
| 6806.10.00.40 | Batts, exceeding 61 cm in width[m2] | Estimate → | |||
| 6806.10.00.60 | Pipe coverings[m2] | Estimate → | |||
| 6806.10.00.90 | Other[m2] | Estimate → | |||
| 6806.20.00.00 | Exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials (including intermixtures thereof)[kg] | Free | 30% | Estimate → | |
| 6806.90.00 | Other | Free | 30% | ||
| 6806.90.00.10 | Accoustical pads and boards[m2] | Estimate → | |||
| Other: | |||||
| 6806.90.00.20 | Of molded calcium silicate[m2] | Estimate → | |||
| 6806.90.00.90 | Other[kg] | Estimate → |
11 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 6806.10.00 at the general rate of 3.9%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (3.9%) | $390.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $437.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- BH
- U.S.–Bahrain FTA
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.