• Adhesives

Desmodur® 44 MC Liquid

Desmodur® 44 MC Liquid is a monomeric diphenylmethane-4,4'-diisocyanate (MDI).Desmodur® 44 M Flakes is a monomeric diisocyanate that is solid at room temperature and liquid above around 40 °C.

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Product Types

  • MMDI
  • MDI
  • Aromatic polyisocyanate
  • Isocyanate
  • Reactive system



General Characterization

Desmodur® 44 MC Liquid is a monomeric diphenylmethane-4,4'-diisocyanate (MDI).
Desmodur® 44 MC Liquid is a monomeric diisocyanate that is solid at room temperature and liquid above around 40 °C. It is suitable for combination with Baycoll®, Desmophen® and Acclaim® in the formulation of adhesives and polyurethane coating resins.

Storage Conditions

- Storage in original sealed Covestro container.

- Recommended storage temperature: 41 - 45 °C.

- Protect from moisture, heat and foreign material.

General information: The product is sensitive to moisture. Like all isocyanates, it reacts with water to form insoluble urea derivatives and carbon dioxide. In closed containers, the formation of carbon dioxide can results in a dangerous build-up of pressure. Contact with air, especially coupled with exposure to light, accelerates the yellowing of the product. Liquid product should therefore be padded with dry nitrogen. Generally speaking, the processing properties are not affected by yellowing. As a result of dimerization (formation of uretdione), the product is sensitive to heat. The solid product dimerizes more quickly at room temperature than the liquid product stored at 42 °C. Therefore, solid product should be stored at temperatures below 5 °C and melted quickly and carefully. Although dimerization declines with decreasing temperature, the storage stability is also limited at 5 °C. Handling instructions, safety data, information about the transport of bulk liquids and customer tank farms and proposals for melting units can be supplied on request.


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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
Viscosity at 40 °C (2011-0313703-95) mPa*s 4.1
NCO content (theoretical) % by wt. 33.6
Phenyl isocyanate content (2011-0489801-95) ppm max. 10
Vapor pressure at 20 °C hPa < 10^-5
Density at 40 °C DIN 51 757 g/cm3 approx. 1.19
Freezing point (2011-0260102-92) °C min. 38.4


Property Name Test Method Unit Value
4,4'-MDI MDI-01-06 % min. 98.2
Dimer *Valid only for the time of delivery MDI-01-08 % max. 0.1
Hydrolysable chlorine MDI-01-04 mg/kg 50 ± 10
2,4'-MDI MDI-01-06 % max. 1.8


Technical Data Sheet
Safety Data Sheet
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