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Polymeric Isocyanate Desmodur 44V20

General Properties and Applications

Desmodur44V20 is a liquid, dark brown polymeric isocyanate based on diphenylmethane-4.4′-diisocyanate (MDI) with isomers and homologues of higher functionality. It is used in conjunction with polyols to produce polyurethane.

Specification

Property Value Unit of
measurement
Method
NCO content 30.5-32.5 % by wt. MDI-01-01
Viscosity 25 °C*) 160-240 mP·s MDI-01-02
Acidity max.200 mg/kg MDI-01-03
*) Lengthy storage can lead to an increase in the viscosity of Desmodur® 44V20 L, although in our experience this has no adverse effect on the processing properties of the product.

Other Data

Property Value Unit of
measurement
Method
Density 20 °C approx. 1.23 g/cm* DIN 51757
Phenylisocyanate content max.50 ppm MDI-01-09
Coefficient of thermal expansion 6.59.10-4 K-1
Specific heat (cp) approx. 1.51 kJ/kgK

Storage

Recommended storage temperature: + 10 to + 30 °C (in exceptional casesup to 50°C)

Storage stability (ex works): 6 months if stored in moisture-tight drums

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