Polybutene-1 Resin PB-1 from Mexico
Polybutene-1 (PB-1) is a polyolefin polymer derived from butene-1 monomer, classified under HTS 3902.90.00 as it falls within polymers of other olefins in primary forms (pellets or granules). It meets the subheading note requiring the monomer unit to contribute 95% or more by weight. Used in pipes, films, and sealants due to its flexibility and sealability.
Duty Rate — Mexico → United States
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Verify monomer content exceeds 95% butene-1 via lab testing to confirm classification; provide supplier certificates of analysis for Customs review
• Avoid blending with other polymers over 5% to prevent reclassification
• Ensure proper UN packaging for molten resin shipments