Diisobutylene from Japan
Diisobutylene (2,4,4-trimethylpentene isomers) results from isobutylene dimerization in petroleum processing. Classified HTS 2901.29.1050 as petroleum-derived unsaturated acyclic C8 hydrocarbon mixture of defined isomers. Used in antioxidants, lube additives, and fuel detergents.
Duty Rate — Japan → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Specify isomer ratio (typically 80% 2,4,4-TMP-1/20% 2,4,4-TMP-2) in technical data sheet
• Stable at ambient temperatures; provide autoignition temperature (210°C) for fire safety
• Mixture of isomers still qualifies as 'separate chemically defined' per Chapter Note 1(b)