4,4'-Di-alpha-cumyl Diphenylamine from Mexico
This sterically hindered diphenylamine derivative acts as a premium antioxidant for natural and synthetic rubber, extending service life in tires and belts. HTS 2921.44.2000 applies due to its listing in additional U.S. note 3 to section VI, subjecting it to quantitative import restrictions. The cumyl groups provide superior heat aging resistance.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Confirm exact chemical matches U.S. note 3 specifications via molecular weight and NMR data submission
• Coordinate with rubber manufacturers for quota allocation letters
• Common issue: incorrect HS declaration as polymer additive leads to 3824 classification