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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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Allgemeine Charakterisierung

Desmodur® 44 C Fused is 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.

Lagerungsbedingungen

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.

Probenahme

Moisture access should be prevented when taking product samples.

Verpackungsart

Desmodur® 44 C Fused can be supplied as a solidified block in large drums ( net weight 225 kg )

Technische Eigenschaften & Datenblätter

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

Name der Eigenschaft Prüfverfahren Einheit Wert
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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