Flexible Polyurethane Prepolymer
A low-viscosity polyurethane prepolymer in primary form for flexible foam production. Classified under HTS 3909.50.5000 as 'Other' polyurethanes where the named polymer units dominate 95%+ by weight. Used in mattress and cushion manufacturing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If urea-formaldehyde resin characteristics dominate
Subheading note prioritizes predominant monomer; urea units over 50% shift to amino-resins.
If petroleum-based copolymer predominates
If non-polyurethane monomers exceed by weight, classifies under petroleum polymers per note (a)(4).
If imported as cellular foam sheets
Primary form resins exclude cellular/plates; foamed products go to 3921 cellular plastics.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Include supplier specs confirming primary form and polyurethane predominance to prevent misclassification as a finished good
• Label shipments clearly as 'primary form resins' to distinguish from foamed articles under 3921
Related Products under HTS 3909.50.50.00
Thermoplastic Polyurethane Pellets
TPU pellets in primary form for injection molding of shoe soles. HTS 3909.50.5000 as 'Other' polyurethanes, confirmed by 95%+ polyurethane monomer dominance. High abrasion resistance grade.
Waterproof Polyurethane Coating Resin
Aliphatic polyurethane resin for UV-resistant waterproof coatings. HTS 3909.50.5000 'Other' polyurethanes in primary forms per 95% rule. Used on outdoor fabrics.
Polyurethane Reactive Hotmelt Resin
Moisture-curing polyurethane hotmelt adhesive resin in primary form. Classifies under 3909.50.5000 for 'Other' polyurethanes with 95%+ monomer units. For wood bonding.
Polyurethane Sealant Base Resin
One-component polyurethane resin for construction sealants. Primary form under 3909.50.5000 as qualifying 'Other' polyurethane polymer.
Flame Retardant Polyurethane Resin
Halogen-free flame retardant polyurethane for electronics potting. HTS 3909.50.5000 primary 'Other' polyurethanes.
UV Curable Polyurethane Acrylate
Hybrid polyurethane acrylate oligomer for UV inks. Primary form 3909.50.5000 if PU predominates.