U.S. exports of Supported Catalysts, Not Elsewhere Specified (HS 381519) totaled $81.0M in August 2026.
Importers of Supported Catalysts, Not Elsewhere Specified paid $4.6M in duties in August 2026, an average duty rate of 10.33% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Supported Catalysts, Not Elsewhere Specified imports of $44.1M in August 2026 ran 16% above the year-to-date monthly average of $38.0M.
Last updated: August 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.
222 import shipments a month
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 3 of 4 in heading 3815
Subheading 381519 · $81.0M of $398.5M
ImportsExports
Imports
$44.1MYoY · free account
Exports
$81.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $426.9M of Supported Catalysts, Not Elsewhere Specified and exported $1.4B.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3815190000 | Supported Catalysts, NESOI | $44.1M | 10.33% | 89.25% | $4.6M |
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 | $81.0M |
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.
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Exports · August 2026
destination
customs district
origin
entry
rate provision · imports
10.8% enters free of duty; duty collected equals 10.33% of imports for consumption.