Isotactic Polybutene Granules from Canada
Isotactic polybutene granules, a stereoregular polymer of butene with high crystallinity, fall under HTS 3902.90.0050 as 'other' primary olefin polymers (>95% butene content). Used in films and molded parts for its strength and chemical resistance. Classified per note (a)(1) for named poly- prefixes.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Include stereochemistry details in technical data sheets for CBP review
• Segregate from polyethylene shipments to prevent co-mingling errors
• Watch for moisture content affecting primary form integrity