Ethylidene Norbornene from China
Ethylidene norbornene (ENB) is a diene comonomer (C10H14) derived from petroleum DCPD streams. Despite bicyclic structure, classified under HTS 2901.29.1050 as petroleum-derived unsaturated acyclic hydrocarbon per principal chain rule. Essential for EPDM rubber production providing vulcanization sites.
Duty Rate — China → United States
35%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Provide NY ruling reference (HQ H095677) confirming acyclic classification despite bicyclic appearance
• Peroxide inhibitor required; declare concentration (50-100 ppm) to prevent exotherm during storage
• Distinguish from dicyclopentadiene (Chapter 2902) by double bond position and GC retention time