Urea-Thiourea Copolymer Resin from Mexico
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 — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Analyze comonomer ratio via NMR for customs; declare nitrogen/sulfur content indirectly verifying composition; avoid high humidity storage causing clumping