Desmodur® ultra DA-L

Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate. Desmodur® ultra DA-L is a liquid polyisocyanate, emulsifiable in aqueous polymer dispersions

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General Characterization

Desmodur ultra DA-L is a hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
Desmodur ultra DA-L is a solvent-free liquid polyisocyanate, emulsifiable in aqueous polymer dispersions. 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 a crosslinking agent for largely pH-neutral aqueous polymer dispersions, such as polyurethane, polyvinylacetate, polyacrylate and synthetic rubber dispersions. Crosslinking raises the resistance of the bonds to heat, water, plasticizers and numerous solvents.

Storage Conditions

Desmodur ultra DA-L should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. Hydrophilic isocyanates are very moisture-sensitive and react with water to form carbon dioxide and insoluble ureas. The containers must always be kept tightly closed. The access of water in all forms (moist air, solvents, moist containers) must be prevented, because the generation of carbon dioxide can lead to dangerous increases in pressure. Storage at higher temperatures will result in increase of color and viscosity. Recommended storage temperature is 0º-30ºC.


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Technical Properties & Datasheets


Property Name Test Method Unit Value
Density at 20°C g/ml approx. 1.16
Flash point °C 215


Property Name Test Method Unit Value
Monomeric HDI % ≤ 0.10
NCO content % 19.0 - 21.0
Viscosity at 23^oC mPa∙s 2,400 - 3,600


Technical Data Sheet
Safety Data Sheet
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