Isobutylene Research Grade from Mexico
Ultra-high purity isobutylene (>99.99%) for laboratory and pharmaceutical synthesis, classified under HTS 2901.23.00.00 as a butene isomer.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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