Hexachlorocyclobutadiene from China
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 — China → United States
28.7%
Rate breakdown
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)
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