Standard International Trade Classification
U.S. imports of Carboxylic Acids with Additional Oxygen Functions, NES — Anhydrides, Halides, Peroxides & Derivatives (SITC 51396) totaled $27.5M in August 2026, imported from 25 countries.
Importers of Carboxylic Acids with Additional Oxygen Functions, NES — Anhydrides, Halides, Peroxides & Derivatives paid $3.5M in duties in August 2026, an average duty rate of 12.81% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Carboxylic Acids with Additional Oxygen Functions, NES — Anhydrides, Halides, Peroxides & Derivatives imports of $27.5M in August 2026 ran 16% below the year-to-date monthly average of $32.8M.
Last updated: August 2026 dataClassified under the catch-all position for oxygen-functionalized carboxylic acids not elsewhere specified, this grouping captures a chemically diverse set of industrial intermediates — including anhydrides, halides, peroxides, and peroxyacids — used across pharmaceuticals, agrochemicals, polymer synthesis, and specialty coatings. The NES designation means classification disputes are common: importers must confirm that the specific compound does not fall under a more specific SITC or HTS heading before using this code. Many derivatives in this group are subject to Section 301 tariff scrutiny depending on their country of origin and precise chemical identity.
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371 import shipments a month
The NES designation applies only when the compound cannot be classified under a more specific carboxylic acid heading. Importers should obtain a binding ruling from CBP or consult a licensed customs broker, as misclassification between specific and NES positions is a common audit trigger for organic chemicals.
Not necessarily. While they fall within this broad SITC grouping, peroxyacids and acid halides may carry distinct HTS classifications with different duty rates and may trigger additional regulatory review under EPA or DOT hazmat rules depending on their reactivity profile. Verify the precise 10-digit HTS code before entry.
Basic heading 137 of 465 in section 5
Basic heading 51396 · $27.5M of $27.5B
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Imports · August 2026
origin
China and India together supply 61% of it. China pays 23.0% duty; Canada 0.2%.
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
$27.5MYoY · free account
Exports
$1.1MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $417.5M of Carboxylic Acids with Additional Oxygen Functions, NES — Anhydrides, Halides, Peroxides & Derivatives and exported $35.9M.
Through August 2026. Source: U.S. Census Bureau.