HTS heading 3815 · Chapter 38
HTS 3815: Reaction initiators, reaction accelerators and…
HTS heading 3815 covers reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included. It has 7 tariff lines with a duty rate; the general (MFN) rates are Free (4 lines), 6.5% (1 line), 2.8% (1 line) and others.
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 |
|---|---|---|---|---|---|
| Supported catalysts: | |||||
| 3815.11.00.00 | With nickel or nickel compounds as the active substance[kg] | Free | 25% | Estimate → | |
| 3815.12.00 | With precious metal or precious metal compounds as the active substance | Free | 25% | ||
| 3815.12.00.10 | With platinum group metals as the active substance[kg] | Estimate → | |||
| 3815.12.00.90 | Other[kg] | Estimate → | |||
| 3815.19.00.00 | Other[kg] | Free | 25% | Estimate → | |
| 3815.90 | Other: | ||||
| Consisting wholly of inorganic substances: | |||||
| 3815.90.10.00 | Of bismuth, of tungsten or of vanadium[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 40% | Estimate → |
| 3815.90.20.00 | Of mercury or of molybdenum[kg] | 2.8% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 18% | Estimate → |
| 3815.90.30.00 | Other[kg] | Free | 25% | Estimate → | |
| 3815.90.50.00 | Other[kg] | 5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 25% | Estimate → |
9 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 3815.90.10.00 at the general rate of 6.5%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (6.5%) | $650.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $697.14 |
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.