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Desmodur® Ultra DN

Hydrophilic aliphatic HDI-polyisocyanate. Emulsifiable in aqueous polymer and synthetic rubber dispersions. Raises the resistance of bonds to heat, water and plasticizers.

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Material

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General Characterization

Desmodur® Ultra DN is an aliphatic polyisocyanate of low volatility.
Desmodur Ultra DN is a solvent-free liquid polyisocyanate that is emulsifiable in water. Any occasional turbidity or precipitation visible is caused by very small amounts of processing aids. These have no adverse effect on the processing and final properties of the cured adhesives. It can be used as the crosslinker for largely pH-neutral aqueous polymer dispersions including polyurethane, polyvinyl acetate, polyacrylate and synthetic rubber dispersions. Crosslinking increases the resistance of the bonds to heat, water, plasticisers and many solvents. Compared with Desmodur DA, Desmodur Ultra DN is characterised by its much lower viscosity and is not prone to turbidity at low storage temperatures.

Storage Conditions

Desmodur Ultra DN should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product. Recommended storage temperature is 0º-30ºC.

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Technical Properties & Datasheets

Property Name Test Method Unit Value
NCO content % 21.8 ± 0.5
HDI monomer content % < 0.10
Viscosity at 23oCRotation mPa∙s 1,250 ± 300

Property Name Test Method Unit Value
Solid content % 100
Density at 20°C g/cm3 approx. 1.15
Flash point °C approx. 218

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