Isoprene with p-Menthadiene Impurities from Japan
Commercial isoprene containing controlled p-menthadiene impurities from thermal dimerization limits. Still classified as principal isoprene compound per Chapter 29 classification rules. 'Other' category accommodates typical commercial impurity profiles.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Specify impurity limits in COA (p-menthadiene typically <2%); higher levels risk reclassification
• Monitor for auto-polymerization; temperature-controlled shipping prevents solid 'popcorn polymer' formation
• Customs may request comparative pricing data vs pure monomer to verify commercial grade status