Thiourea-Formaldehyde Resin
Thiourea-formaldehyde resin is a primary form amino-resin produced from thiourea and formaldehyde, with these monomers contributing over 95% by weight of the polymer content. It is used in specialty adhesives and molding compounds. This resin is classified under tariff item 3909.39.00 as an 'Other' amino-resin, as it is not specifically named in other subheadings.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the resin is a urea resin rather than a thiourea resin.
Urea resins are classified under a specific subheading for urea-based amino-resins.
If the resin is a phenolic resin instead of an amino-resin.
Phenolic resins are classified separately from amino-resins.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure that thiourea and formaldehyde monomers together exceed 95% by weight of the resin to qualify for this tariff item
• Keep the resin in primary form (powder, granules, or liquid) and avoid any further processing that could change its classification
• If the resin contains additives such as fillers or plasticizers exceeding 1% by weight, verify whether it still meets the definition of a 'composition' under supplementary note 2
Related Products under Tariff item 3909.39.00
Aniline-Formaldehyde Resin
Aniline-formaldehyde resin is an amino-resin produced by the condensation of aniline and formaldehyde, with these monomers contributing over 95% by weight of the polymer content. It is imported in primary granular form and is used as an adhesive in plywood manufacturing and in protective coatings. This resin falls under tariff item 3909.39.00 as an 'Other' amino-resin, not elsewhere specified.
Benzoguanamine-Formaldehyde Resin
Benzoguanamine-formaldehyde resin is a high-performance amino-resin produced from benzoguanamine and formaldehyde, with these monomers contributing over 95% by weight of the polymer content. It is imported in primary bead form and is primarily used in automotive coatings and industrial finishes. This resin is classified under tariff item 3909.39.00 as an 'Other' amino-resin, as it is not specifically named in other headings.
Dicyandiamide-Formaldehyde Resin
Dicyandiamide-formaldehyde resin is a thermoset amino-resin produced from dicyandiamide and formaldehyde, with these monomers contributing over 95% by weight of the polymer content. It is imported in primary powder form and is used in flame-retardant laminates and specialty adhesives. This resin falls under tariff item 3909.39.00 as an 'Other' amino-resin, not specifically named elsewhere.
Melamine-Formaldehyde Resin
Melamine-formaldehyde resin is a thermosetting amino-resin produced by the reaction of melamine with formaldehyde, with these monomers contributing over 95% by weight of the polymer content. It is supplied in primary form as granules or powder and is widely used in laminates, tableware, and adhesives. This resin is classified under tariff item 3909.39.00 as an 'Other' amino-resin, as melamine resins are not specifically named in other subheadings.
Melamine-Glyoxal Resin
Melamine-glyoxal resin is an amino-resin variant produced from melamine and glyoxal, with these monomers contributing over 95% by weight of the polymer content. It is imported as a primary liquid resin and is used in paper coatings and textile treatments. This resin falls under tariff item 3909.39.00 as an 'Other' amino-resin, not specifically named in other subheadings.