Diisobutylene from Canada
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 — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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)