Isopentane 99% Purity from Japan
Isopentane (2-methylbutane), a branched saturated acyclic hydrocarbon used as a blowing agent in polystyrene foam production. Classified under HTS 2901.10.30.00 as a chemically defined isomer per Chapter 29 note (a). Differs from n-pentane in its branched structure.
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
• Provide GC-MS analysis confirming 99% isopentane content to prevent disputes; comply with EPA foaming agent regulations
• Pitfall: improper storage leading to vapor pressure issues in shipping