U.S. exports of Catalysts & Catalytic Preparations (NES) (SITC 59889) totaled $90.2M in August 2026.
Importers of Catalysts & Catalytic Preparations (NES) paid $1.7M in duties in August 2026, an average duty rate of 9.20% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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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517 import shipments a month
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.
Basic heading 64 of 465 in section 5
Basic heading 59889 · $90.2M of $26.2B
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Exports · August 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
$18.6MYoY · free account
Exports
$90.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $243.6M of Catalysts & Catalytic Preparations (NES) and exported $1.1B.
Through August 2026. Source: U.S. Census Bureau.