• Adhesives
  • Coatings, paints & inks

Desmodur® E 21

Aromatic polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI).

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Product Types

  • MDI
  • PIC
  • Prepolymer
  • Crosslinkers
  • Hardeners
  • Isocyanate
  • Reactive system
  • Polyisocyanate


Fast bonding, Moisture resistant, Solvent-free
Coatings, paints & inks
Hard, Solvent-free

General Characterization

Desmodur E 21 is an aromatic polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI).
This product is suitable 1.) as a binder for the formulation of moisture-curing, one-component coatings and adhesives and 2.) as a hardener for hydroxyl-bearing co-reactants.

Storage Conditions

Desmodur E 21 should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture and should therefore be stored in its sealed original containers. Storage at high temperatures will lead to an increase in viscosity and a reduction of the NCO content. Recommended storage temperature is room temperature (approximately 23ºC).


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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
Density at 20^oC g/ml approx. 1.15
Equivalent weight 251 - 274
Flash point °C > 250


Property Name Test Method Unit Value
Viscosity at 25°C mPa∙s 5,400 ± 1,300
NCO content % 16.0 ± 0.7


Technical Data Sheet
Safety Data Sheet
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