Isoprene with p-Menthadiene Impurities from Mexico
Commercial isoprene containing controlled p-menthadiene impurities from thermal dimerization is classified under this item as the principal compound. The impurities are incidental and do not alter the fundamental nature of the isoprene. This aligns with Chapter 29 note 1(a) which permits impurities in chemically defined compounds.
Duty Rate — Mexico → Canada
0%
Import Tips
• Document the impurity profile and demonstrate that the product retains its identity as isoprene
• Keep records of the dimerization process to justify the impurity levels
• Consult with a customs broker to ensure the impurity content does not trigger reclassification