Polymeric MDI is a brown liquid polymethylene polyphenylene polyisocyanate with an average isocyanate functionality above two. It is the workhorse isocyanate component for rigid polyurethane (PUR) and polyisocyanurate (PIR) foams, binders and two-component polyurethane systems
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Isocyanate component for rigid PUR and PIR insulation foam
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Binder for OSB, particleboard and wood-composite panels
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Crosslinker for foundry/core binders, composites and structural adhesives
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Isocyanate side of two-component (2K) polyurethane coating and elastomer systems
Safety & Handling
Full SDS available on request
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
PMDIpMDIpolymeric MDIpolymethylene polyphenylene polyisocyanatepolymeric methylene diphenyl diisocyanateComparable to Mondur MRComparable to Lupranate M20
Full Description
Polymeric MDI (PMDI) reacts with polyols to build the crosslinked network that gives rigid PUR/PIR foam its closed-cell structure and dimensional stability, making it the standard isocyanate for thermal-insulation boardstock, spray foam and panel systems. Its higher functionality and low vapor pressure relative to monomeric MDI also make it suited to wood-composite binders for OSB and particleboard, foundry and core binders, and structural or laminating adhesives. In two-component (2K) polyurethane systems it serves as the crosslinker for coatings, sealants and elastomers. RawSource supplies PMDI in bulk to foam producers, panel manufacturers and CASE formulators
Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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