2-Pyrrolidone (2-Pyrrolidinone)
2-Pyrrolidone is a five-membered lactam ring compound used as a high-boiling solvent in pharmaceuticals, electronics, and polymer manufacturing. Classified under HTS 2933.79.85.00 as an other lactam with nitrogen hetero-atom only, not specifically enumerated elsewhere. Its cyclic amide structure distinguishes it from acyclic amides.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If incorrectly identified as pyridine derivative
Pyridine (six-membered) vs pyrrolidone (five-membered lactam); ring size and amide function determine correct lactam heading.
If acyclic amide analog without lactam ring closure
Lactam classification requires cyclic amide structure; open-chain amides fall under carboxamide headings.
If imported as formulated solvent mixture > specific use
Chapter note (e) excludes solutions rendered suitable for specific uses beyond safety/transport.
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Import Tips & Compliance
• Include NMR or HPLC purity certificates (>99%) to confirm heterocyclic lactam identity and avoid amide reclassification
• Comply with TSCA inventory requirements; provide end-use declaration to prevent diversion to restricted solvent applications
• Watch for misclassification as N-methylpyrrolidone (different HTS 2933.79.29); verify methyl substitution absent
Related Products under HTS 2933.79.85.00
Caprolactam
Caprolactam is a cyclic amide (lactam) with a six-membered ring containing a nitrogen hetero-atom, used primarily as a monomer in the production of nylon 6 polymer. It falls under HTS 2933.79.85.00 as a lactam that is neither specifically named in prior subheadings nor a beta-lactam antibiotic structure. This chemically defined heterocyclic compound with nitrogen hetero-atom only meets Chapter 29 requirements for classification.
Epsilon-Caprolactam Technical Grade
Technical grade epsilon-caprolactam contains 95-99% purity with stabilizers, used in industrial nylon production. Falls under HTS 2933.79.85.00 as other lactams per chapter notes allowing stabilizers for preservation/transport. Remains classified as chemically defined compound despite minor impurities.
N-Methyl-2-Pyrrolidone Stabilized
N-Methyl-2-pyrrolidone (NMP) is a methylated lactam used as solvent in battery production and paint strippers, here with anti-oxidant stabilizer. Classified HTS 2933.79.85.00 as other lactams (distinct from unsubstituted 2933.79.29). Stabilizer permitted per chapter note (f) for preservation.
Piperidin-2-One
Piperidin-2-one (δ-valerolactam) is a six-membered lactam ring used in organic synthesis and polymer chemistry. Classified under HTS 2933.79.85.00 as other lactams with nitrogen hetero-atom only. Distinguish from piperidine bases by amide functionality.
Caprolactam with Anti-Caking Agent
Caprolactam powder treated with silicon dioxide anti-caking agent for bulk handling and transport. Permitted under HTS 2933.79.85.00 per chapter note (g) for identification/safety additives not rendering specific use suitability. Maintains principal lactam classification.
Valerolactam (5-Methyl-2-Pyrrolidone)
Valerolactam is a substituted five-membered lactam used in polymer synthesis and as pharmaceutical intermediate. HTS 2933.79.85.00 covers this alkyl-substituted lactam not specifically named in prior subheadings. Meets nitrogen-heteroatom only heterocyclic criteria.