Isobutylene Research Grade from Japan
Ultra-high purity isobutylene (>99.99%) for laboratory and pharmaceutical synthesis, classified under HTS 2901.23.00.00 as a butene isomer.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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