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Thanecure® T9SF (TDI Dimer)

Thanecure® T9 SuperFine (SF)

Thanecure T9SF is dimerized TDI (the dimer of 2,4-toluene diisocyanate).  It is a polyfunctional isocyanate used primarily as a vulcanizing agent for polyurethane rubbers, as a crosslinker for heat-activated adhesive systems and as an adhesion promoter for rubber-to-fabric bonding.


For more information about Millathane® and Thanecure® products, please contact: Lynn Zylka at (727) 540-1358 or contact Lynn here.

Product Description and Typical Properties

Chemical Composition Dimeric 2,4-toluene diisocyanate
Molecular weight 348
Density Approximately 1.48 g/cc
Melting Point Minimum 145ºC
Monomer (TDI) Content Less than 0.1%
Screens Minimum 99% through 325 mesh
Particle size, Malvern Minimum 75% less than 10 microns
Appearance Fine, white powder
Packaging 50 lb (22.7 kg) box
Storage Stability 24 months from date of manufacture, under dry and cool conditions



Under mild reaction conditions (i.e., at up to ~ 130º C in the absence of basic catalysts), TDI Dimer is primarily bifunctional, with a molecular weight of 348.  Under more severe conditions (either at temperatures above 140/150º C or with the aid of highly basic catalysts at temperatures above 90º C) TDI dimer remains primarily bifunctional but with a molecular weight of 174, as the central uretdione group splits to form monomeric TDI.   NOTE: Please refer to the Material Safety Data Sheet and to the available literature regarding the handling of TDI.



  • Vulcanizing agent for isocyanate-curable polyurethane rubbers, particularly when a high hardness is desired. Applications include industrial molded parts, rollers, ceramic tile molds
  • Crosslinker for heat-activated adhesion, coating or elastomer systems
  • Adhesion promoter for rubber-to-fabric bonding (polyester, aramid, polyamide). Applications include tire cord, conveyor belts, drive belts, hose, coated fabrics
  • Adhesion promoter for PVC-to-fabric bonding (polyester, aramid, polyamide). Applications include coated fabrics, conveyor belts



Grams of Thanecure T9 Superfine per 100 cc of solvent
  23ºC 50ºC 100ºC
Toluene 0.1 2.0 18
Chlorobenzene 0.3 3.0 36
o-Dichlorobenzene 0.1 2.0 7