Multi-purpose and easy processing

Desmodur® TDI-based systems for hot cast polyurethane elastomers

Polyurethane hot cast elastomers based on toluene diisocyanate (TDI) can be formulated with a wide range of mechanical properties. Different hardness levels are possible with ester- or ether-based prepolymers.

TDI-based systems

Conventional TDI-terminated prepolymers for cast polyurethane elastomers are processed using hot casting methods. Desmodur® systems from Covestro include polyether- and polyester-based products. Desmodur® prepolymers are designed to be processed with various curatives.





Desmodur® TDI-polytetramethylene ether glycol (PTMEG) systems provide PU elastomers with excellent properties:

  • Good abrasion resistance, high tensile strength and high resilience, even at low temperatures
  • Good resistance to hydrolysis and microorganisms
  • Low viscosities for easy processing
  • Large range of hardnesses from 80A to 80D

Desmodur® TDI-ester systems offer a robust set of characteristics:

  • High tear resistance
  • Excellent dynamic properties
  • Good chemical resistance
  • A low compression set
  • Hardness levels of 80 to 95 Shore A

Specialty Desmodur® TDI-ester systems are available with:

  • Lower viscosities for easier processing
  • 20 to 58 Shore A hardness for very aggressive environments
  • Good resistance to both water and hydrocarbons

We also offer Desmodur® systems with a low unreacted TDI content in ether and ester versions. Besides H&S benefits, the lower viscosities and longer pot lives enable easier processing and the casting of a greater variety of parts with improved performance.

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