Hexamethylene Diisocyanate (HDI) from China
Hexamethylene diisocyanate (HDI) is an aliphatic diisocyanate with the formula OCNC6H12NCO, classified in HTS 2929.10.80.90 as an 'other' isocyanate per Chapter 29 nitrogen function provisions. It produces flexible, UV-resistant polyurethanes for automotive clearcoats.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Mandatory Hazard Class 6.1 UN 2281 labeling; ensure importer has OSHA-compliant exposure controls
• Test for free NCO content (47-48%) to confirm monomeric HDI vs. biuret/trimer forms