Hexachlorocyclobutadiene from Mexico
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 — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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