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  • Adhesives

Desmodur® CD-S

Desmodur CD-S is a modified isocyanate based on diphenylmethane-4,4'-diisocyanate with Carbodiimid-content, "liquified " MDI

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About

Product Types

  • MDI
  • MMDI
  • Aromatic polyisocyanate

Material

Adhesives
Solvent-free

General Characterization


Desmodur® CD-S is a modified isocyanate based on diphenylmethane-4,4' -diisocyanate. It is a solvent-free liquid which is slightly yellowish and of low viscosity at room temperature. It crystallizes at lower temperatures.


Desmodur® CD-S is used for the production of polyurethane products.

Storage Conditions

The recommended storage is temperature 20 to 25°C for drums, IBCs and tanks.


Desmodur® CD-S is moisture-sensitive and should therefore always be stored in tightly sealed original containers. Prolonged storage at temperatures above 25°C results in a reduction in quality as the product becomes increasingly cloudy due to the deposition of low-solubility sediment (dimer formation). If the recommended storage temperature is exceeded for a long period (especially if the temperature of the product rises to above 25°C), or if the recommended shelf life is exceeded, a chemical reaction may take place. In addition to a reduction in the NCO content and an increase in viscosity, carbon dioxide in particular may be generated. The resultant increase in pressure may cause the container to swell or burst. Storage at above 25°C considerably shortens the shelf life. Storage at below 20°C results in crystallization. Desmodur® CD-S should under no circumstances be stored in crystallized form as this will promote the formation of insoluble dimers and it will no longer be possible to melt the product completely. Delivered product should be spot-checked for crystallization, and cooling to below 20°C must be avoided. If Desmodur® CD-S has been transported or stored below 20°C for a short time, the material must immediately be melted at 60-70°C. The melting point and the time required for this should not be exceeded as this also significantly promotes dimer formation. The entire container contents must be melted and homogenized before the container is immediately sealed and cooled to the recommended storage temperature. There is no risk that quality will be affected should the product have crystallized briefly, but it can be expected that the shelf life will be reduced. The melted material should be used as soon as possible.

Sampling

Moisture access should be prevented when taking product samples

Packaging Type

No data available

Technical Properties & Datasheets

Property Name Test Method Unit Value
NCO-content MDI-01-01 % by wt. 29.0 - 30.0
Viscosity at 25 °C MDI-01-02 mPa*s 20 - 50
Hydrolysable chlorine MDI-01-04 ppm max. 50
Hydrolysable chlorine MDI-01-04 ppm max. 50
Viscosity at 25 °C MDI-01-02 mPa*s 20 - 50
NCO-content MDI-01-01 % by wt. 29.0 - 30.0

Downloads

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