Polybutene-1 Resin PB-1 from China
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 — China → United States
44%
Rate breakdown
9903.88.0225%Except as provided in headings 9903.88.12, 9903.88.17, 9903.88.20, 9903.88.54, 9903.88.59, 9903.88.61, 9903.88.63, 9903.88.66, 9903.88.67, 9903.88.68, 9903.88.69, or 9903.88.70, articles the product of China, as provided for in U.S. note 20(c) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(d)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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