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SITCSection 5
U.S. exports of maleic anhydride (SITC 51381) totaled $4.4M in July 2026.
Importers of Maleic Anhydride paid $187K in duties in July 2026 — an effective duty rate of 22% on $856K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataMaleic anhydride is a reactive cyclic anhydride produced primarily from the catalytic oxidation of benzene or n-butane, and it serves as a foundational building block for unsaturated polyester resins (UPR) used in fiberglass-reinforced composites, as well as for alkyd resins, lubricant additives, and agricultural chemical intermediates. Global trade in maleic anhydride has been shaped by antidumping proceedings targeting imports from several major producing countries, making origin verification and trade-remedy compliance a standing concern for US buyers. Its solid flake or molten liquid forms require distinct packaging and hazmat handling protocols, and the form of shipment should be clearly declared on entry documents.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
19 shipments/mo
Basic heading 395 of 465 in section 5
Basic heading 51381 · $982K of $28.9B
Maleic anhydride has been the subject of antidumping investigations involving imports from multiple countries. US importers should check current USITC and Commerce Department orders to determine whether active antidumping or countervailing duty orders apply to their specific supplier country, as duty deposits on covered entries can be substantial.
Yes. Maleic anhydride is shipped in solid flake form in bags or bulk containers, or as a molten liquid in heated ISO tanks. The two forms require different UN hazmat classifications, packaging groups, and temperature-control specifications. The commercial invoice and bill of lading should clearly state the physical form and concentration to ensure correct hazmat documentation and avoid port-of-entry delays.
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Exports · July 2026
destination
Mexico and Canada together take 66% of it.
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
$982KYoY · Pro
Exports
$4.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.