Lactam (Beta-Propiolactam) from Mexico
Beta-propiolactam, though strained, functions as an acyclic amide equivalent in reactivity. HTS 2924.19.80.00 accommodates it as an 'other' acyclic amide derivative before potential polymerization.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Highly reactive; inhibitor-stabilized shipping required
• Polymer precursor declaration for end-use verification
• Avoid ring emphasis preventing acyclic classification