Polymeric MDI (PMDI) Resin
PMDI is a crude poly(methylene phenyl isocyanate) oligomer mixture used in rigid foam manufacturing, meeting the 95% monomer unit threshold per subheading rules. Classified under HTS 3909.31.00.00 as a primary form amino-resin precursor for polyurethane systems. Typically shipped in ISO tanks for large-scale industrial use.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically modified beyond base polymer
Modifications place it in 'other amino-resins' per subheading note (a)(3), not the specific poly(methylene phenyl isocyanate).
If formulated as adhesive prepolymer
Partial reaction into peptones or protein-like structures for glues shifts to Chapter 35.
If for organic composite solvents with MDI
Solvent-diluted MDI preparations are mastics or composite solvents, not primary polymers.
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Import Tips & Compliance
• Obtain manufacturer's certificate confirming crude/polymeric status and monomer composition to avoid reclassification
• Comply with TSCA import requirements for new chemicals
• Watch for drum residue contamination leading to waste classification issues
Related Products under HTS 3909.31.00.00
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 falls under HTS 3909.31.00.00 as it precisely matches the subheading for poly(methylene phenyl isocyanate) in primary forms within amino-resins. This unprocessed chemical is supplied in drums for industrial formulation.
Lupranate M20R Polymeric MDI
Lupranate M20R is a commercial grade crude MDI with high isocyanate functionality for spray foam insulation production, qualifying under 3909.31 due to predominant monomer units. This primary form chemical is essential for reacting with polyols in polyurethane formulations. Supplied in bulk for construction industry applications.
Suprasec 5005 Crude MDI
Suprasec 5005 is a polymeric MDI variant for CASE (coatings, adhesives, sealants, elastomers) applications, classified in HTS 3909.31.00.00 for its primary poly(methylene phenyl isocyanate) composition. Meets subheading note (a)(1) with ≥95% relevant monomer content. Used in two-component industrial systems.
Polyurethane Precursor P-MDI 44V20L
P-MDI 44V20L is a low-viscosity crude polymeric MDI for flexible foam precursors, falling under HTS 3909.31.00.00 per polymer classification rules for monomer predominance. Primary form essential for slabstock and molded foam production. Bulk liquid chemical for resin manufacturers.
Industrial Grade Polymeric MDI (MDI-P)
Industrial MDI-P is crude poly(methylene phenyl isocyanate) for binding wood panels in OSB production, precisely matching HTS 3909.31.00.00 criteria. Primary polymer form used in isocyanate wood glue systems. High-functionality oligomer for structural composites.
BASF Lupranat MP 102 Polymeric MDI
BASF Lupranat MP 102 is a polymeric MDI for continuous panel lines, classified under HTS 3909.31.00.00 as crude poly(methylene phenyl isocyanate) meeting purity standards. Primary form for rigid polyurethane insulation boards. Supplied in heated railcars.