U.S. imports of Carboxylic Acids with Aldehyde or Ketone Function (HS 291830) totaled $6.2M in September 2026, imported from 19 countries.
Importers of Carboxylic Acids with Aldehyde or Ketone Function paid $812K in duties in September 2026, an average duty rate of 12.02% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: September 2026 dataOxo-carboxylic acids — compounds bearing both a carboxylic acid group and an aldehyde or ketone function — are used as pharmaceutical building blocks, flavor precursors, and synthetic intermediates. The US schedule distinguishes aromatic from non-aromatic members and further enumerates specific compounds such as 1-formylphenylacetic acid methyl ester (2918301000) and oxalacetic acid (2918307000). France and Switzerland lead US import supply, a pattern consistent with the concentration of fine-chemical and pharmaceutical-intermediate production in Western Europe.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
142 import shipments a month
Non-aromatic carboxylic acids with aldehyde or ketone functions that are not specifically enumerated fall under the residual line 2918309000. The aromatic versus non-aromatic distinction is determined by whether the compound contains a benzene or other aromatic ring as part of its principal structure. When the classification is ambiguous, a binding ruling request to CBP is the most reliable path to certainty.
Many organic chemical intermediates classified in Chapter 29, including goods under this heading, have been subject to Section 301 tariffs on imports from China. The specific lines affected and any exclusions granted can change over time. Importers sourcing from China should verify current Section 301 applicability with a licensed customs broker before finalizing procurement decisions.
Trade Directory
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2918309000 | Non-Aromat Carboxy Acids With Aldehyde Etc Fnc Etc | $5.6M | 14.92% | 97.02% | $832K |
| 2918307000 | Dimethyl Acetyl Succinate; Oxalacetic Acid Etc...n | $905K | 26.07% | 100.00% | $236K |
| 2918303000 | Other Arom Carboxy Acids With Aldehyde Etc Fnc Etc | $125K | 39.14% | 100.00% | $49K |
| 2918302550 | Aromatic Carboxy Acids With Aldehyde or Ketone Etc | $25K | 40.49% | 100.00% | $10K |
| 2918301000 | 1-Formylphenylacetic Acid, Methyl Ester | — | -- | -- | -- |
| 2918302500 | Aromatic Carboxy Acids With Aldehyde or Ketone Etc | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2918300090 | Carboxylic Acids With Aldehyde or Ketone Func Etc | $4.3M |
| 2918300010 | Methyl 3-Oxo-2-Phenylbutanoate (Mapa) | $14K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Subheading 7 of 17 in heading 2918
Subheading 291830 · $6.2M of $109.7M
Imports · September 2026
origin
Switzerland and Spain together supply 49% of it. China pays 37.5% duty; Spain 8.2%.
customs district
destination
entry
rate provision · imports
2.8% enters free of duty; duty collected equals 12.02% of imports for consumption.
ImportsExports
Imports
$6.2MYoY · free account
Exports
$4.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $70.8M of Carboxylic Acids with Aldehyde or Ketone Function and exported $46.9M.
Through September 2026. Source: U.S. Census Bureau.