Urea-Thiourea Copolymer Resin from Canada
Copolymer where urea units predominate over thiourea (>95% combined per subheading note), used in paper impregnation. HTS 3909.10.00.00 covers as urea resin series with predominant monomer. Improves wet strength in specialty papers.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Analyze comonomer ratio via NMR for customs; declare nitrogen/sulfur content indirectly verifying composition; avoid high humidity storage causing clumping