γ-HBCD Isomer (Gamma-Hexabromocyclododecane) from China
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 — China → United States
38.7%
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
• 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)