U.S. imports of Unsaturated Acyclic Monocarboxylic Acids (NES) and Cyclic Monocarboxylic Acids, Anhydrides, and Derivatives (SITC 51379) totaled $64.4M in August 2026, imported from 43 countries.
Importers of Unsaturated Acyclic Monocarboxylic Acids (NES) and Cyclic Monocarboxylic Acids, Anhydrides, and Derivatives paid $6.2M in duties in August 2026, an average duty rate of 9.48% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Unsaturated Acyclic Monocarboxylic Acids (NES) and Cyclic Monocarboxylic Acids, Anhydrides, and Derivatives imports of $64.4M in August 2026 ran 34% above the year-to-date monthly average of $47.9M.
Last updated: August 2026 dataBenzoic acid and its derivatives — including sodium benzoate, one of the most widely used food preservatives globally — are among the most commercially significant compounds in this broad residual heading, alongside acrylic acid, sorbic acid, and cyclic acids such as cyclohexanecarboxylic acid. Acrylic acid in particular is a high-volume petrochemical monomer used in superabsorbent polymers, coatings, and adhesives, and its trade has been subject to antidumping scrutiny in several markets. The heading's NES and cyclic scope makes it a classification catch-all, so precise chemical identification — including whether a compound is acyclic or cyclic — is essential for correct entry.
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851 import shipments a month
Acrylic acid (propenoic acid) falls under this heading as an unsaturated acyclic monocarboxylic acid NES, while methacrylic acid (2-methylpropenoic acid) has its own dedicated SITC heading (51373). The two are structurally similar but commercially distinct monomers with different polymer applications; importers must specify the correct compound name and CAS number to ensure proper classification.
Sodium benzoate is generally recognized as safe (GRAS) for food use in the US within specified concentration limits, but imported product intended for food applications should be accompanied by a certificate of analysis confirming purity and absence of prohibited contaminants. FDA may review labeling and intended-use declarations at entry, and importers should ensure their supplier is registered under FDA's food facility registration requirements.
Basic heading 63 of 465 in section 5
Basic heading 51379 · $64.4M of $27.5B
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Imports · August 2026
origin
China pays 34.4% duty; France 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
$64.4MYoY · free account
Exports
$58.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $552.2M of Unsaturated Acyclic Monocarboxylic Acids (NES) and Cyclic Monocarboxylic Acids, Anhydrides, and Derivatives and exported $524.8M.
Through August 2026. Source: U.S. Census Bureau.