HDI isocyanurate trimer is a low-monomer aliphatic polyisocyanate resin built on the thermally stable isocyanurate (trimer) ring of hexamethylene diisocyanate (HDI). It is used as the hardener in two-component polyurethane coatings requiring high durability and light stability
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Hardener/crosslinker for high-durability, light-stable two-component (2K) polyurethane coatings
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Crosslinks hydroxyl acrylic and polyester resins into weatherable, chemical-resistant films
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Automotive OEM and refinish clearcoats and basecoats
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Industrial-maintenance and protective coatings
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.
HDI trimerHDI isocyanuratehexamethylene diisocyanate isocyanurate trimerHDI homopolymer (isocyanurate)aliphatic polyisocyanate hardenerComparable to Desmodur N3300 / N3390Comparable to Tolonate HDTComparable to Duranate TPA-100
Full Description
The isocyanurate ring gives this HDI polyisocyanate strong thermal and hydrolytic stability, and crosslinking it with hydroxyl-functional acrylic or polyester resins produces 2K polyurethane films with excellent light stability, weathering performance and chemical resistance. It is a workhorse hardener for automotive OEM and refinish clearcoats and basecoats, industrial-maintenance systems and protective coatings. Compared with the biuret grade, the trimer typically offers higher functionality and improved hardness and weatherability. RawSource supplies HDI isocyanurate-trimer polyisocyanate in bulk to coating 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.
