Urea-Thiourea Copolymer Resin from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 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