• Adhesives
  • Coatings

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
Hard, Solvent-free

General Characterization

Aromatic polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI).

As a binder for the formulation of moisture-curing, one-component coatings and adhesives.

As a hardener for hydroxyl-bearing co-reactants.

Storage Conditions

- Storage in original sealed Covestro container.

- Recommended storage temperature: room temperature (approx. 23 °C)

- Protect from moisture, heat and foreign material.

General information: 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.


No data available

Packaging Type

No data available

Technical Properties & Datasheets


Property Name Test Method Unit Value
NCO MDI-01-01 % 16.0 ± 0.7
Viscosity 25 °C MDI-01-02 mPa*s 5,400 ± 1,300


Property Name Test Method Unit Value
Flash point DIN EN ISO 2719 °C > 250
Density 20 °C DIN EN ISO 2811-1 g/ml approx. 1.15
Equivalent weight 251 - 274


Technical Data Sheet
Safety Data Sheet
No direct download available, please visit www.productsafetyfirst.covestro.com

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