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U.S. imports of lactams (other than epsilon-caprolactam) (HS 293379) totaled $23.7M in July 2026, traded with 25 countries.
Importers of Lactams (Other Than Epsilon-Caprolactam) paid $726K in duties in July 2026 — an effective duty rate of 18% on $4.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Lactams (Other Than Epsilon-Caprolactam) imports of $23.7M in July 2026 ran 47% below the year-to-date monthly average of $44.7M.
Beyond caprolactam, this heading captures a range of commercially significant lactam compounds including N-methyl-2-pyrrolidone and 2-pyrrolidone (2933792000) — widely used as high-boiling industrial solvents in electronics, pharmaceuticals, and battery manufacturing — N-vinyl-2-pyrrolidone monomer (2933793000), and 12-aminododecanoic acid lactam (2933794000), the monomer for Nylon 12. The heading also includes the diketopyrrolopyrrole pigment intermediate 2,4-dihydro-3,6-diphenylpyrrolo-(3,4-C)pyrrole-1,3-dione (2933790400), used in high-performance coatings and plastics colorants. Classification within the heading depends on whether the compound is aromatic or modified-aromatic and whether it falls under Additional US Note 3 to Section VI, both of which affect the applicable duty line.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
175 shipments/mo
NMP is classified as a substance of very high concern under various regulatory frameworks and is subject to EPA review under the Toxic Substances Control Act (TSCA). While TSCA does not generally block importation, importers must comply with any applicable TSCA reporting or certification requirements and should monitor evolving EPA risk management rules that could affect downstream use.
Additional US Note 3 to Section VI identifies specific chemical products by CAS number or description that receive distinct tariff treatment. Lactams falling within that note are classified under dedicated subheadings (e.g., 2933790800) rather than the general NESOI lines, which can result in different duty rates. Importers should match the CAS number of their product against the note's product list before filing entry.
HSChapter 29
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2933790800 | Lactams of Prod. Descr. in Add. U.S. Note 3, NESOI | $18.7M | 2.03% | 7.06% | $379K |
| 2933794000 | 12-Aminododecanoic Acid Lactam | $2.2M | 6.15% | 61.46% | $137K |
| 2933791500 | Arom or Mod-Arom Lactams (Exc Prod in U.S. Nt3 Etc | $1.2M | 0.05% | 0.77% | $592 |
| 2933798500 | Lactams, NESOI | $1.2M | 6.74% | 83.88% | $78K |
| 2933792000 | N-Methyl-2-Pyrrolidone; and 2-Pyrrolidone | $426K | 28.84% | 90.57% | $123K |
| 2933790400 | 2,4-Dihydro-3,6-Diphenylpyrrolo-(3,4-C)Pyrrole- | $24K | 31.40% | 100.00% | $8K |
| 2933793000 | N-Vinyl-2-Pyrrolidone, Monomer | $10K | 15.50% | 100.00% | $2K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2933790002 | Lactams, NESOI | $24.8M |
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 6 of 27 in heading 2933
Subheading 293379 · $23.7M of $482.5M
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ImportsExports
Imports
$23.7MYoY · Pro
Exports
$24.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Singapore and France together supply 75% of it.
customs district
destination
entry
rate provision · imports
22.4% enters free of duty; the effective duty rate is 3.07%.