U.S. exports of Maleic Anhydride (SITC 51381) totaled $4.8M in August 2026.
Importers of Maleic Anhydride paid $124K in duties in August 2026, an average duty rate of 18.26% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Maleic Anhydride imports of $681K in August 2026 ran 22% below the year-to-date monthly average of $872K.
Last updated: August 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.
14 import shipments a month
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.
Basic heading 302 of 465 in section 5
Basic heading 51381 · $4.8M of $26.2B
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Exports · August 2026
destination
Mexico and Germany together take 65% 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
$681KYoY · free account
Exports
$4.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $10.0M of Maleic Anhydride and exported $49.3M.
Through August 2026. Source: U.S. Census Bureau.