Butyrolactam (2-Pyrrolidone) from Canada
2-Pyrrolidone contains oxygen in lactam structure (five-membered ring), used in pharmaceuticals and polymers. Dual O/N heteroatoms but oxygen heading applies. HTS 2932.99.90 classification.
Duty Rate — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Lactam vs amide distinction critical; cyclic lactam qualifies as heterocycle
• Hygroscopic; sealed packaging maintains purity specs
• NMP substitute; end-use statements distinguish applications