Isobutylene Research Grade from Canada
Ultra-high purity isobutylene (>99.99%) for laboratory and pharmaceutical synthesis, classified under HTS 2901.23.00.00 as a butene isomer.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include lot-specific purity certificates from accredited labs
• Small cylinder shipments require special academic/research import permits
• Distinguish from fuel-grade isobutylene to avoid Chapter 27/38 classifications