Hexachlorocyclobutadiene from Japan
Hexachlorocyclobutadiene is a highly reactive four-membered ring with alternating double bonds and chlorines. HTS 2903.89.70 captures this as halogenated cyclenic hydrocarbon due to its conjugated diene system. Used as Diels-Alder dienophile in polymer chemistry.
Duty Rate — Japan → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Ship as stabilized complex (Fe or Ni) to prevent dimerization
• Use Schlenk techniques for moisture-free transfer
• Document <1% dimer content for purity classification