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SITCSection 5
U.S. imports of aldehydes with other oxygen function, cyclic aldehyde polymers & paraformaldehyde (nes) (SITC 51622) totaled $20.8M in April 2026, traded with 25 countries.
Importers of Aldehydes with Other Oxygen Function, Cyclic Aldehyde Polymers & Paraformaldehyde (NES) paid $2.8M in duties in April 2026 — an effective duty rate of 16% on $17.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataAldehydes bearing additional oxygen functions — such as hydroxyl, keto, or ether groups — along with cyclic aldehyde polymers and paraformaldehyde, occupy this residual heading for oxygen-functionalized aldehyde chemistry not covered by more specific provisions. Paraformaldehyde, a solid polymer of formaldehyde, is commercially important as a slow-release formaldehyde source in resin manufacture and as a disinfectant, offering handling advantages over aqueous formalin. Vanillin and other aromatic aldehyde-phenols used in food flavoring fall within the broader oxygen-functionalized aldehyde space, though their precise classification depends on structural specifics.
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Paraformaldehyde is a solid with a much lower vapor pressure than formalin (37–50% aqueous formaldehyde), reducing inhalation exposure risk during transport and storage. It still requires DOT hazardous materials labeling as a flammable solid and an irritant, but its solid form simplifies packaging, reduces leakage risk, and can lower freight costs for international shipments compared to bulk liquid formalin.
Because this heading is an NES (not elsewhere specified) provision, importers must confirm that the compound is not more specifically described under a named aldehyde heading or under ketone, acid, or ester headings that may capture bifunctional molecules. Providing the full IUPAC name, CAS number, and a structural diagram to the customs broker — along with any relevant CBP binding rulings — is the most reliable way to defend the classification.
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Monthly import values over time