Maleimide from Canada
Maleimide is an unsaturated five-membered aromatic lactam with a nitrogen hetero-atom, used in polymer chemistry and Diels-Alder reactions. Under HTS 2933.79.1500 as other aromatic lactams, it fits the heterocyclic nitrogen-only category per Chapter 29 definitions. Its chemically defined structure excludes it from earlier acyclic headings.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Specify polymerization inhibitor if present as stabilizer; test for epoxide exclusions under note to 2932-2934
• Avoid bulk solvent mixes that trigger note (e) scrutiny