Isotactic Polybutene Powder from Mexico
Isotactic polybutene powder, a stereoregular olefin homopolymer, is classified under HTS 3902.90.00 for other olefins in primary powder form suitable for compounding. Monomer purity exceeds chapter note requirements. Applied in sealants and electrical insulation.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Specify tacticity (isotactic >90%) in documentation to avoid rubber classification; use anti-static bags for powder handling
• Comply with REACH-like labeling for EU-origin resins
• Monitor particle size distribution for dust explosion risks