HTS heading 6815 · Chapter 68
HTS 6815: Articles of stone or of other mineral substances, not…
HTS heading 6815 covers articles of stone or of other mineral substances (including carbon fibers, articles of carbon fibers and articles of peat), not elsewhere specified or included. It has 9 tariff lines with a duty rate; the general (MFN) rates are Free (9 lines).
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 |
|---|---|---|---|---|---|
| Carbon fibers; articles of carbon fibers for non-electrical uses; other articles of graphite or other carbon for non-electrical uses: | |||||
| 6815.11.00.00 | Carbon fibers[kg] | Free | 45% | Estimate → | |
| 6815.12.00.00 | Fabrics of carbon fibers[kg] | Free | 45% | Estimate → | |
| 6815.13.00.00 | Other articles of carbon fibers[kg] | Free | 45% | Estimate → | |
| 6815.19.00.00 | Other[kg] | Free | 45% | Estimate → | |
| 6815.20.00.00 | Articles of peat[kg] | Free | 20% | Estimate → | |
| Other articles: | |||||
| 6815.91.00 | Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite | Free | 30% | ||
| 6815.91.00.11 | Containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch[kg] | Estimate → | |||
| 6815.91.00.71 | Other[kg] | Estimate → | |||
| 6815.99 | Other: | ||||
| 6815.99.20.00 | Talc, steatite and soapstone, cut or sawed, or in blanks, crayons, cubes, disks or other forms[kg] | Free | 2.2¢/kg | Estimate → | |
| 6815.99.41 | Other | Free | 30% | ||
| 6815.99.41.10 | Containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch[kg] | Estimate → | |||
| 6815.99.41.70 | Other[kg] | Estimate → | |||
| I. GOODS OF SILICEOUS FOSSIL MEALS OR OF SIMILAR SILICEOUS EARTHS, AND REFRACTORY GOODS | |||||
| 6901.00.00.00 | Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths[t] | Free | 30% | Estimate → |
13 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 6815.11.00.00 at the general rate of Free, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (Free) | $0.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $47.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.