Naphthalene Diisocyanate (NDI) from Canada
Naphthalene-1,5-diisocyanate (NDI) features two -NCO groups on a naphthalene backbone, falling under HTS 2929.10.80.90 as other isocyanates with nitrogen function. Applied in crystalline polyurethanes for engineering plastics.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Hazard Class 6.1 solid UN 3077; specify low moisture content (<0.1%) to prevent trimerization
• FTIR spectroscopy verification needed for characteristic NCO peak at 2270 cm⁻¹