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SITCSection 5
U.S. exports of catalysts & catalytic preparations (nes) (SITC 59889) totaled $80.9M in July 2026.
Importers of Catalysts & Catalytic Preparations (NES) paid $3.4M in duties in July 2026 — an effective duty rate of 18% on $19.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Catalysts & Catalytic Preparations (NES) imports of $25.0M in July 2026 ran 19% above the year-to-date monthly average of $20.9M.
Last updated: July 2026 dataCatalysts and catalytic preparations not elsewhere specified encompass unsupported homogeneous catalysts, catalyst precursors, and proprietary catalytic blends that do not fit the supported-catalyst subheadings — including organometallic complexes used in polymerization, enzyme-based biocatalysts for specialty chemical synthesis, and phase-transfer catalysts. The diversity of chemistries within this residual heading makes classification inherently fact-intensive, and importers should be prepared to provide detailed compositional and functional descriptions. Some organometallic catalyst systems may also be subject to chemical import notification requirements under TSCA.
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601 shipments/mo
Basic heading 144 of 465 in section 5
Basic heading 59889 · $25.0M of $28.9B
Enzyme preparations used primarily for their catalytic function in industrial chemical synthesis — rather than as food additives or pharmaceutical ingredients — may fall under this heading, but the classification is fact-specific. If the enzyme is the primary active ingredient and the preparation is designed for a catalytic industrial process, this heading is a candidate; however, enzyme preparations with food or pharmaceutical end uses are typically classified elsewhere.
Under TSCA Section 13, importers must certify that chemical substances either comply with TSCA or are not subject to it. Novel organometallic catalyst compounds not listed on the TSCA Chemical Substance Inventory may require a Pre-Manufacture Notice (PMN) or Low Volume Exemption filing before import. Importers should confirm inventory status with their regulatory counsel prior to the first commercial shipment.
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Exports · July 2026
destination
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$25.0MYoY · Pro
Exports
$80.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.