γ-HBCD Isomer (Gamma-Hexabromocyclododecane) from Mexico
The gamma stereoisomer of hexabromocyclododecane, the most stable form, falls under HTS 2903.89.40.00 as a defined halogenated cyclic hydrocarbon. Chapter 29 classification applies due to its chemical purity and direct carbon-bromine linkages in the cyclododecane ring. Used in polymer flame retardant masterbatches.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
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
• Include thermal stability data showing gamma-isomer dominance for correct tariff verification
• Avoid common pitfall of declaring as 'HBCD mixture'; specify isomer for 2903.89.40.00 classification
• Prepare for CBP requests for CAS registry verification (CAS 25637-99-4 covers stereoisomers)