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Desmodur® 44 C Fused

A monomeric diphenylmethane 4,4' diisocyanate (MDI) with a molecular weight of 250 [g/mol]. At room temperature the product takes the form of a white to pale yellow solid. It is used to produce polyurethanes, among other things.

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Product Types

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Material

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General Characterization

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Storage Conditions

Like all isocyanates, Desmodur® 44 C Fused is sensitive to moisture and reacts with water to form insoluble urea derivatives and carbon dioxide. The generation of carbon dioxide in sealed containers can lead to a dangerous build-up of pressure.



Contact with air, especially if accompanied by simultaneous exposure to light, accelerates yellowing. It is therefore advisable to store liquid Desmodur® 44 C Fused under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.



Desmodur® 44 C Fused is sensitive to heat and likely to dimeriation. The solid product dimerises more rapidly at room temperature than the liquid product stored at 43 °C.



Crystallized Desmodur® 44 C Fused should therefore be stored at temperatures below +5 °C and melted rapidly but gently before use. Although the rate of dimerisation decreases as the temperature drops, storage stability is still limited even at temperatures below + 5 °C.



Handling regulations, technical data relating to safety, advice on the transportation of liquids and on customer tank farms and suggestions for melting equipment are available from us on request.

Sampling

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Packaging Type

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Technical Properties & Datasheets

Property Name Test Method Unit Value
Viscosity at 40 °C MDI-01-02 mPa*s 4.1
Purity ( mol. wt. 250 ) MDI-01-01 % by wt. ≥ 99.5
Heat of fusion J/g approx. 102
Density at 40 °C DIN 51757 g/cm³ 1.19
NCO-content (theoretical) % by wt. 33.6
Phenylisocyanate-content MDI-01-09 ppm ≤ 10
Freezing point MDI-01-17 °C ≥ 38.4
Specific heat (cp) kJ/kg*K approx. 1.39

Property Name Test Method Unit Value
MDI-Dimer* MDI-01-08 % by wt. ≤ 0.10
2,4'-isomer content MDI-01-06 % by wt. ≤ 1.8
Hydrolysable chlorine MDI-01-04 ppm ≤ 50

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