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SITCSection 5
U.S. exports of cyclanic, cyclenic & cycloterpenic polycarboxylic acids, anhydrides & derivatives (SITC 51385) totaled $3.6M in July 2026.
Importers of Cyclanic, Cyclenic & Cycloterpenic Polycarboxylic Acids, Anhydrides & Derivatives paid $534K in duties in July 2026 — an effective duty rate of 20% on $2.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Basic heading 356 of 465 in section 5
Basic heading 51385 · $2.6M of $28.9B
Encompassing alicyclic polycarboxylic acids — including cyclohexane dicarboxylic acids, their anhydrides, halides, peroxides, and peroxyacids — this heading captures a structurally diverse group of intermediates used in specialty coatings, epoxy curing agents, and fragrance chemistry. The alicyclic ring structure distinguishes these compounds from both aromatic phthalates and straight-chain aliphatic acids, a distinction that matters for correct SITC classification when a product could plausibly fall under adjacent headings. Importers dealing in hexahydrophthalic anhydride (HHPA) or similar curing agents should verify classification carefully, as misclassification between this heading and aromatic anhydride categories is a common audit finding.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
54 shipments/mo
The key distinction is ring saturation: cyclanic (cyclohexane-based) and cyclenic acids contain non-aromatic carbocyclic rings, while aromatic acids like phthalic anhydride contain benzene rings. Chemical documentation — including structural formula and CAS number — is essential to support the correct classification and avoid reclassification during a CBP audit.
Epoxy resin curing agents (particularly hexahydrophthalic anhydride and methylhexahydrophthalic anhydride) are the dominant end use, serving the electrical laminates and composites sectors. Specialty alkyd resins for low-yellowing coatings and certain fragrance intermediates also consume material from this heading.
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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
$2.6MYoY · Pro
Exports
$3.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.