γ-HBCD Isomer (Gamma-Hexabromocyclododecane)
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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If esterified with saturated acyclic alcohols during synthesis
Chapter note 5(A) requires ester classification with later numerical heading; modifies acid-function classification.
If chemically modified into nonspecified wood preservatives
Chapter 38 takes precedence for specific end-use formulations even if chemically similar.
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Import Tips & Compliance
• 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)
Related Products under HTS 2903.89.40.00
1,3,5,7,9,11-Hexabromocyclododecane (HBCD) Technical Grade
1,3,5,7,9,11-Hexabromocyclododecane (HBCD) is a brominated flame retardant classified as a halogenated derivative of cyclanic hydrocarbons under HTS 2903.89.40.00. This technical grade product consists primarily of stereoisomers used in industrial applications for fire safety. It meets chapter 29 requirements for separate chemically defined organic compounds with bromine directly linked to the cyclic carbon structure.
α-HBCD Isomer (Alpha-Hexabromocyclododecane)
The alpha stereoisomer of 1,3,5,7,9,11-hexabromocyclododecane is a specific chemically defined organic compound under HTS 2903.89.40.00. As a halogenated derivative of cyclododecane, it qualifies per chapter notes for separate isomers of organic compounds. Used primarily as a research chemical and flame retardant intermediate.
β-HBCD Isomer (Beta-Hexabromocyclododecane)
Beta-1,3,5,7,9,11-hexabromocyclododecane is the gamma-stable isomer classified specifically under HTS 2903.89.40.00 as a halogenated cyclanic hydrocarbon derivative. This chemically pure form meets chapter 29 note (b) for separate isomers. Primarily used in analytical standards and specialized flame retardant formulations.
HBCD Reference Standard 98% Purity
High-purity 1,3,5,7,9,11-hexabromocyclododecane reference standard (98%+) is classified under HTS 2903.89.40.00 as a separate chemically defined compound. Meets chapter requirements for organic halogenated cyclics without excluded preparations. Used for EPA method 8275A calibration and research.