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HSChapter 38
U.S. exports of supported catalysts, not elsewhere specified (HS 381519) totaled $106.7M in July 2026.
Importers of Supported Catalysts, Not Elsewhere Specified paid $3.9M in duties in July 2026 — an effective duty rate of 9.7% on $40.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Supported Catalysts, Not Elsewhere Specified imports of $45.1M in July 2026 ran 21% above the year-to-date monthly average of $37.2M.
Last updated: July 2026 dataSupported catalysts not covered by the nickel or precious-metal subheadings — including those based on cobalt, molybdenum, vanadium, copper, or mixed-metal systems — serve refinery hydrotreating, polymerization, and environmental control applications. Japan leads US import supply for this residual heading, followed by Belgium and Italy, countries with established catalyst manufacturing industries serving global refining and chemical markets. Classification here requires confirming that the active substance is neither nickel nor a precious metal; mixed-metal catalysts where a precious metal is the primary active component should be evaluated against heading 381512 before defaulting to this NESOI line.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
240 shipments/mo
Classification depends on which metal functions as the primary active substance. If the precious metal (palladium) is the catalytically active component and the base metal is a promoter or support modifier, heading 381512 likely applies. If the base metal (molybdenum) is the active substance and the precious metal is incidental, 381519 may be appropriate. Technical data sheets and supplier declarations identifying the active catalytic component are essential, and a CBP binding ruling is advisable for ambiguous formulations.
Spent catalysts containing certain metals — particularly those with residual hazardous constituents — may be subject to EPA Resource Conservation and Recovery Act (RCRA) regulations if classified as hazardous waste. Importation of hazardous waste for disposal is generally prohibited under US law, though imports for reclamation or regeneration may be permitted under specific conditions. Importers should assess the material's regulatory status before shipment.
Subheading 2 of 4 in heading 3815
Subheading 381519 · $45.1M of $140.2M
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3815190000 | Supported Catalysts, NESOI | $45.1M | 8.73% | 89.67% | $3.9M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3815190000 | Supported Catalysts, NESOI | $106.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$45.1MYoY · Pro
Exports
$106.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
10.3% enters free of duty; the effective duty rate is 8.73%.