Chapter 3909 — Customs Tariff Headings

3909.20.00Melamine resins

3909.3Other amino-resins:

3909.40.00Phenolic resins

3909.50.00Polyurethanes

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Products classified under Tariff item 39.09

High-Purity Urea Resin for Foundry Binders

High-purity urea-formaldehyde resin powder used as a binder in foundry core systems. It is in primary form, meeting the 95% monomer rule for classification as a urea resin under this tariff item.

Liquid Urea-Formaldehyde Pre-Condensate Resin

Liquid urea-formaldehyde pre-condensate resin in primary form, used as an adhesive for plywood. It is a low-molecular-weight prepolymer with over 95% urea-formaldehyde units, fitting the urea resin classification.

Low-Formaldehyde Emission Urea Resin

Scavenger-modified urea-formaldehyde resin powder with reduced free formaldehyde, used for interior paneling. The core urea resin exceeds 95% content, and the modification does not alter its classification as a urea resin in primary form.

Melamine-Urea-Formaldehyde (MUF) Copolymer Resin

Melamine-urea-formaldehyde copolymer resin where urea-formaldehyde units predominate by over 95% by weight, used in laminated wood panels. It is classified as a urea resin under the subheading note's monomer predominance rule.

Spray-Dried Urea Formaldehyde Microcapsules

Spray-dried urea-formaldehyde resin microcapsules in primary powder form, used for controlled-release applications. The polymer shell is chemically unmodified and exceeds 95% urea-formaldehyde content, fitting the urea resin classification.

Thiourea-Formaldehyde Resin Granules

Thiourea-formaldehyde resin granules in primary form, a sulfur analog of urea resins used in specialty adhesives. It is explicitly named in the tariff item as a thiourea resin, qualifying for classification here.

Urea-Formaldehyde Resin Powder

Urea-formaldehyde resin powder produced by condensing urea and formaldehyde, used in wood adhesives and particleboard production. It is a primary-form urea resin with over 95% polymer content, fitting this tariff item.

Urea-Resin Molding Compound Pellets

Pelletized urea-formaldehyde resin in primary form for compression molding of electrical insulators and dinnerware. It is an unmodified urea resin exceeding 95% polymer content, classified under this tariff item.

Urea-Resin Textile Finishing Agent Concentrate

Concentrated urea-formaldehyde resin emulsion for crease-resistant textile finishing, with over 95% active polymer content. It is in primary form as a liquid dispersion, fitting the urea resin classification.

Urea-Thiourea Copolymer Resin

Urea-thiourea copolymer resin where urea units predominate over thiourea, used in paper impregnation. It is classified as a urea resin under the subheading note's monomer predominance rule, with combined urea and thiourea units exceeding 95%.

High-Purity Melamine Resin Powder MF-80

High-purity melamine resin powder MF-80 with a minimum 98% melamine-formaldehyde content, used for precision molding applications. This product falls under tariff item 3909.20.00 as a melamine resin in primary form, meeting the 95% monomer contribution rule for classification.

Industrial Melamine Resin Flakes

Industrial melamine resin flakes used for paper impregnation in laminate production. These flakes are a primary form of melamine-formaldehyde resin, classified under tariff item 3909.20.00 as melamine resins with over 95% polymer content.

Melamine-Acrylic Copolymer Resin

Melamine-acrylic copolymer resin where melamine units predominate by weight over acrylic comonomers, supplied in primary flake form. This product is classified under tariff item 3909.20.00 as a melamine resin, per subheading note (a)(4) for predominant monomer classification.

Melamine Crosslinking Agent Resin

Hexamethoxymethylmelamine resin used as a crosslinking agent in coatings, with over 95% melamine-derived units. This product is a primary form melamine resin, classified under tariff item 3909.20.00 as a melamine resin.

Melamine-Formaldehyde Resin Powder

Melamine-formaldehyde resin powder produced by polymerization of melamine and formaldehyde, supplied as a white powder for industrial use. This primary form melamine resin meets tariff item 3909.20.00 as a melamine resin with high melamine content.

Melamine Molding Compound Granules

Granular melamine resin in primary form designed for compression molding applications like tableware. This product is classified under tariff item 3909.20.00 as a melamine resin with high melamine content meeting the 95% polymer rule.

Melamine Resin for Wood Adhesives

Liquid melamine resin concentrate (60% solids) in primary form for particleboard adhesives. This product is a concentrated polymer solution, classified under tariff item 3909.20.00 as a melamine resin in primary form.

Textile Finishing Melamine Resin

Etherified melamine resin emulsion for wrinkle-resistant fabric finishing. This chemically modified melamine resin is classified under tariff item 3909.20.00 per subheading note (a)(3) as it is not specifically covered elsewhere.

Unmodified Melamine Resin Pellets

Pelletized pure melamine resin in primary form for extrusion and compounding processes. This unmodified polymer with melamine as the predominant monomer unit falls under tariff item 3909.20.00 as a melamine resin.

BASF Lupranat MP 102 Polymeric MDI

BASF Lupranat MP 102 is a polymeric MDI (crude poly(methylene phenyl isocyanate)) used primarily in continuous panel lines for rigid polyurethane insulation. It is presented in primary form (liquid) and meets the tariff item's specification for polymeric MDI, as it contains the required isocyanate monomer units. This product is essential for manufacturing rigid foam panels with high thermal insulation properties.

Crude MDI (Polymeric Methylene Diphenyl Diisocyanate)

Crude MDI is a primary form polyisocyanate containing 95% or more methylene phenyl isocyanate monomer units by weight, used as a key raw material in polyurethane production. It is a liquid at ambient temperature and is classified under this tariff item as poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI). This product is essential for manufacturing rigid and flexible polyurethane foams, coatings, and adhesives.

Industrial Grade Polymeric MDI (MDI-P)

Industrial Grade Polymeric MDI (MDI-P) is crude poly(methylene phenyl isocyanate) used for binding wood panels in OSB (oriented strand board) production. It is a primary form polymer used in isocyanate wood glue systems, providing high functionality and adhesion. This product matches the tariff item's description as crude MDI, polymeric MDI, and is essential for manufacturing engineered wood products.

Lupranate M20R Polymeric MDI

Lupranate M20R is a commercial grade crude MDI with high isocyanate functionality, specifically designed for spray foam insulation production. It is a primary form liquid polymer that meets the tariff item's specification for poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI). This product is essential for producing rigid polyurethane foam with excellent thermal and mechanical properties.

Polymeric MDI (PMDI) Resin

Polymeric MDI (PMDI) Resin is a crude poly(methylene phenyl isocyanate) oligomer mixture used in rigid foam manufacturing. It meets the 95% monomer unit threshold per subheading rules, ensuring classification under this tariff item. This primary form amino resin is essential for producing high-performance rigid polyurethane foams for insulation and structural applications.

Polyurethane Precursor P-MDI 44V20L

P-MDI 44V20L is a low-viscosity crude polymeric MDI used for flexible foam precursors, falling under this tariff item per polymer classification rules for monomer predominance. It is a primary form liquid essential for slabstock and molded flexible foam production. This product meets the tariff item's description as poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI).

Suprasec 5005 Crude MDI

Suprasec 5005 is a polymeric MDI variant for CASE (coatings, adhesives, sealants, elastomers) applications, classified in this tariff item for its primary poly(methylene phenyl isocyanate) composition. It is a primary form liquid that meets the subheading rules for monomer predominance. This product is essential for producing high-performance polyurethane systems in various industrial applications.

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.

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.

Baking Phenolic Resin

Baking phenolic resin is a heat-curable resin derived from phenol-formaldehyde condensation, designed for stoving applications in paints and coatings. It is imported in primary form, such as liquid or powder, and falls under tariff item 3909.40.00 as a phenolic resin.

Bisphenol A Phenolic Resin

Bisphenol A phenolic resin substitutes bisphenol for phenol in epoxy-like applications but remains a phenolic resin. It is imported in primary form and classified under this tariff item when phenolic units predominate, used in advanced composites and coatings.

Creol Phenolic Resin

Creol phenolic resin, also known as cresol-formaldehyde resin, uses cresol instead of phenol for enhanced flexibility in coatings. It qualifies under this tariff item as phenolic resins include alkyl-substituted phenols, and it is imported in primary form.

Foundry Grade Phenolic Urethane Resin Binder

Foundry grade phenolic urethane resin binder is the pure phenolic resin component of two-part foundry binders, reacted with polyol for sand cores. It is imported in primary form and falls under this tariff item as a phenolic resin, enabling no-bake casting processes.

High Ortho Phenolic Resin

High ortho phenolic resin features high ortho substitution for faster curing in laminates, produced via specialized catalysis. It is an unmodified phenolic primary polymer, falling under this tariff item, and is used in copper-clad laminates.

Liquid Phenolic Resol for Adhesives

Liquid phenolic resol resin is a primary form polymer for plywood and laminate adhesives, reacting phenol with excess formaldehyde. It is classified under this tariff item due to its phenolic resin composition, meeting Chapter 39 requirements for primary forms.

Novolac Phenolic Resin

Novolac phenolic resin is a thermosetting polymer produced by reacting phenol with formaldehyde under acidic conditions, requiring a hardener for curing. It falls under this tariff item as a phenolic resin in primary form, used in molding and coatings.

Phenol-Formaldehyde Molding Compound Base Resin

Phenol-formaldehyde molding compound base resin is the pure resin used as the base for molding compounds, supplied in primary form before fillers are added. This tariff item covers it as a phenolic resin, with strict monomer weight rules applied.

Powdered Novolac Resin for Friction Materials

Powdered novolac resin for friction materials is ground phenolic polymer for brake pads and clutch facings, cured with hexamine. This tariff item applies as it is a primary phenolic resin before compounding, providing heat resistance in automotive friction applications.

Resol Phenolic Resin

Resol phenolic resin is a liquid or semi-solid thermosetting resin formed by base-catalyzed reaction of phenol and formaldehyde, self-curing upon heating. It is classified under this tariff item as a primary form phenolic resin, used in adhesives and coatings.

Bio-Based Elastomeric Polyurethane Resin

A sustainable elastomeric polyurethane resin derived from bio-polyols, supplied in primary form (e.g., pellets or granules) for use in flexible packaging films. It is chemically unmodified and contains over 95% polyurethane monomer content, meeting the classification criteria for polyurethanes under tariff item 3909.50.00.

Conductive Elastomeric Polyurethane Resin

Conductive elastomeric polyurethane resin pellets, filled with less than 5% carbon black, used for ESD flooring and shielding applications. The polyurethane polymer content remains above 95% by weight, and the product is in primary form, qualifying under tariff item 3909.50.00.

Elastomeric Polyurethane for Footwear Sole Resin

Elastomeric polyurethane resin pellets in primary form, designed for reaction injection molding of flexible shoe soles. With 97% polyurethane monomer content and high rebound elastomeric properties, it meets the classification requirements for polyurethanes under tariff item 3909.50.00.

Elastomeric Polyurethane Hot-Melt Adhesive Resin

Thermoplastic elastomeric polyurethane resin in primary form, formulated for hot-melt adhesives used in packaging and footwear bonding. Its elastomeric nature provides flexible bonds, and the polyurethane monomer content exceeds 95%, qualifying under tariff item 3909.50.00.

Elastomeric Polyurethane Reaction Injection Molding Resin

A two-part elastomeric polyurethane system (polyol and isocyanate) imported separately in primary forms for reaction injection molding of automotive fascia. Each component meets the polyurethane predominance criteria, and the system is classified under tariff item 3909.50.00.

Elastomeric Polyurethane Resin for Industrial Coatings

A primary form elastomeric polyurethane polymer used as a base resin for formulating durable industrial coatings and sealants. The monomer units contribute over 95% to the polymer content, and the product is not further processed, placing it under tariff item 3909.50.00.

Elastomeric Polyurethane Resin for Medical Tubing

Medical-grade elastomeric polyurethane resin in primary pellet form, used for extrusion into flexible catheters and tubing. It is USP Class VI compliant with over 95% polyurethane content, providing biocompatibility and elasticity, and qualifies under tariff item 3909.50.00.

Flame-Retardant Elastomeric Polyurethane Resin

Halogen-free flame-retardant elastomeric polyurethane resin in primary form, used for rail and marine cable jacketing. Reactive flame-retardant additives are less than 5%, keeping the polyurethane content above 95%, and the product qualifies under tariff item 3909.50.00.

High-Performance Elastomeric PU Resin for Wire Coating

Specialty elastomeric polyurethane resin in primary form for insulating flexible electrical cables. It provides abrasion resistance and flexibility, with 98% polyurethane monomer purity, placing it definitively under tariff item 3909.50.00.

Low-Temperature Flexible PU Elastomer Resin

Specialty elastomeric polyurethane resin maintaining flexibility at -40°C, in primary form for arctic cable applications. It is polycarbonate-based with over 95% polyurethane content, qualifying under tariff item 3909.50.00.

Polyurethane Elastomer Masterbatch Resin

Concentrated elastomeric polyurethane masterbatch resin in primary form with minimal colorants (less than 5%), used for molding flexible gaskets. The polyurethane monomers predominate by weight, qualifying under tariff item 3909.50.00.

Self-Healing Elastomeric Polyurethane Resin

Advanced self-healing elastomeric polyurethane resin in primary form, with microcapsule technology (less than 2% additional content), for durable coatings. The base polyurethane exceeds 95% content, meeting the strict subheading criteria for tariff item 3909.50.00.

Spandex Pre-Polymer Resin

A primary form elastomeric polyurethane pre-polymer resin used in the production of spandex fibers for stretch fabrics. It qualifies under tariff item 3909.50.00 due to its high polyurethane monomer content (over 95% by weight) and elastomeric properties.

TPU Pellets for 3D Printing Filament

Thermoplastic polyurethane (TPU) pellets in primary form, elastomeric grade, used to extrude flexible 3D printing filament. With over 95% polyurethane monomer content and Shore hardness indicating elastomeric properties, it meets the criteria for tariff item 3909.50.00.