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HSChapter 29
U.S. imports of lactams (other than epsilon-caprolactam) (HS 293379) totaled $82.1M in April 2026, traded with 25 countries.
Importers of Lactams (Other Than Epsilon-Caprolactam) paid $2.8M in duties in April 2026 — an effective duty rate of 25% on $11.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Lactams (Other Than Epsilon-Caprolactam) imports of $82.1M in April 2026 ran 32% above the year-to-date monthly average of $62.2M.
Last updated: April 2026 dataBeyond 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2933798500 | LACTAMS, NESOI | $62.1M | 11.11% | $108K |
| 2933790800 | LACTAMS OF PROD. DESCR. IN ADD. U.S. NOTE 3, NESOI | $17.4M | 31.13% | $2.5M |
| 2933794000 | 12-AMINODODECANOIC ACID LACTAM | $2.4M | 9.36% | $222K |
| 2933792000 | N-METHYL-2-PYRROLIDONE; AND 2-PYRROLIDONE | $153K | 29.71% | $46K |
| 2933791500 | AROM OR MOD-AROM LACTAMS (EXC PROD IN U.S. NT3 ETC | $82K | 7.82% | $3K |
| 2933793000 | N-VINYL-2-PYRROLIDONE, MONOMER | $9K | 15.51% | $1K |
| 2933790400 | 2,4-DIHYDRO-3,6-DIPHENYLPYRROLO-(3,4-C)PYRROLE- | $3K | 34.99% | $1K |
LACTAMS, NESOI
LACTAMS OF PROD. DESCR. IN ADD. U.S. NOTE 3, NESOI
12-AMINODODECANOIC ACID LACTAM
N-METHYL-2-PYRROLIDONE; AND 2-PYRROLIDONE
AROM OR MOD-AROM LACTAMS (EXC PROD IN U.S. NT3 ETC
N-VINYL-2-PYRROLIDONE, MONOMER
2,4-DIHYDRO-3,6-DIPHENYLPYRROLO-(3,4-C)PYRROLE-
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2933790002 | LACTAMS, NESOI | $9.1M |
LACTAMS, NESOI
1.6M kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| State | Imports | Exports | Balance |
|---|---|---|---|
| New York | $57.0M | $25K | -$57.0M |
| Puerto Rico | $10.6M | -- | -$10.6M |
| California | $5.2M | $67K | -$5.1M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| JFK INTERNATIONAL AIRPORT, NY | $57.9M | $102K | -$57.8M |
| SAN JUAN INTERNATIONAL AIRPORT, PR | $10.6M | -- | -$10.6M |
| NEWARK, NJ | $5.2M | -- | -$5.2M |