HS Code for Urea-formaldehyde resin

Urea-formaldehyde resins that are modified or do not meet the specific criteria for standard urea resins are classified under HS code 3909.39. This code serves as a residual category for "Other" amino-resins in primary forms that are not urea/thiourea resins (3909.10), melamine resins (3909.20), or poly(methylene phenyl isocyanate) (3909.31). Classification under 3909.39 often applies to complex amino-resins where urea is copolymerized with other monomers or where the chemical structure has been significantly etherified or modified with alcohols to change solubility and curing properties. These resins are essential in specialized coatings, textile treatments, and high-performance laminates where standard UF resins lack the necessary moisture resistance or flexibility.

Products Included

• Modified amino-resins
• Etherified urea-formaldehyde resins
• Copolymerized amino-resins (non-melamine)
• Glyoxal-urea resins
• Amino-resins used for textile finishing

Common Misclassification

The most common error is classifying these products under 3909.10. While they contain urea and formaldehyde, the "Other" designation in 3909.39 is required if the resin has been chemically modified beyond the standard condensation product. It is also frequently confused with 3909.31, which is specifically for Crude MDI (polymeric MDI). Importers must verify the chemical composition to ensure the resin does not contain isocyanate groups which would trigger a different classification.

FAQ

What is the HS code for modified urea-formaldehyde resin?

Modified urea-formaldehyde resins that do not fit the standard definition of 3909.10 are classified under HS code 3909.39.

When should I use 3909.39 instead of 3909.10?

Use 3909.39 when the resin is an amino-resin other than pure urea, thiourea, or melamine resins, such as etherified or copolymerized versions.