U.S. imports of Polycarboxylic Acids & Derivatives, NES (SITC 51389) totaled $86.4M in August 2026, imported from 31 countries.
Importers of Polycarboxylic Acids & Derivatives, NES paid $6.2M in duties in August 2026, an average duty rate of 7.48% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataA residual catch-all for polycarboxylic acids and their anhydrides, halides, peroxides, peroxyacids, and halogenated or sulfonated derivatives not classified elsewhere, this heading captures a wide range of specialty and fine-chemical intermediates. Correct classification here depends on confirming that the product does not belong to a more specific SITC heading — a determination that often requires the CAS number, structural formula, and a review of adjacent headings covering aromatic, alicyclic, and named acids. Trade professionals importing novel or multi-functional acid derivatives should consider requesting a binding ruling to lock in classification before commercial volumes arrive.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
749 import shipments a month
Start by checking whether the product matches any named heading — phthalic anhydride, dioctyl orthophthalates, dimethyl terephthalate, or the cyclanic acids group. If none applies, verify with a licensed customs broker or through a CBP binding ruling, providing the CAS number, structural formula, and intended use. Misclassification into or out of an NES heading is a frequent source of post-entry audits.
Certain halogenated acid derivatives may be subject to EPA Toxic Substances Control Act (TSCA) import certification requirements, obligating importers to certify that the substance either complies with TSCA or is not subject to it. Importers should review the TSCA inventory status of the specific compound before shipment.
Basic heading 42 of 465 in section 5
Basic heading 51389 · $86.4M of $27.5B
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Imports · August 2026
origin
Mexico and China together supply 57% of it. China pays 28.6% duty; Mexico 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$86.4MYoY · free account
Exports
$51.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $925.9M of Polycarboxylic Acids & Derivatives, NES and exported $572.9M.
Through August 2026. Source: U.S. Census Bureau.