Desmodur® 44M LIQUID

Desmodur 44M LIQUID is a monomeric diphenylmethane-4,4'-diisocyanate (MDI) with a molecular weight of 250 [g/mol].

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Product Types

  • MDI
  • MMDI

Material

No data available

General Characterization

Desmodur® 44 M LIQUID 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.

Storage Conditions

Like all isocyanates, Desmodur® 44 M LIQUID 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 M LIQUID under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.
Desmodur® 44 M LIQUID 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 M LIQUID 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

Moisture access should be prevented when taking product samples.

Packaging Type

No data available

Technical Properties & Datasheets

Characteristics

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

Specifications

Property Name Test Method Unit Value
Hydrolysable chlorine MDI-01-04 ppm max. 50
Uretdione (dimer) content* MDI-01-08 % by wt. max. 0.1
4,4'-isomer content MDI-01-06 % by wt. min. 98.2
2,4'-isomer content MDI-01-06 % by wt. max. 1.8

Downloads

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