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DESMODUR® 44 M LIQUID

DESMODUR 44 M LIQUID is a monomeric diphenylmethane -4,4'-diisocyanate with a molecular weight of 250 g/mol. At room temperature the product takes the form of a white to light yellow solid. It can be used in conjunction with polyols for the production of polyurethane products.

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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 with a molecular weight of 250 g/mol. At room temperature the product takes the form of a white to light yellow solid.

It can be used in conjunction with polyols for the production of polyurethane products.

Storage Conditions

Recommended storage temperature: 43 ± 2 °C (in a steel tank)
Protect from moisture, heat and foreign material.

Covestro represents that, for a period of ≤ 3 weeks following the day of shipment as stated in the respective delivery documents, the product will meet the values set forth in section "specification" above provided that the product is stored in full compliance with the storage conditions and is otherwise handled appropriately.

The lapse of this period does not necessarily mean that the product no longer meets specifications. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications. Covestro does not make any representation regarding the product after the period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications after the period.

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 of
DESMODUR 44 M LIQUID. 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 dimerization (uretdione formation).
The solid product dimerizes 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 dimerization decreases as the temperature drops, storage stability is still limited even at temperatures below 5 °C.

Sampling

Moisture access should be prevented.

Packaging Type

No data available

Technical Properties & Datasheets

Characteristics

Property Name Test Method Unit Value
Phenylisocyanate-content MDI-01-09 ppm max. 10
Density at 40 °C DIN 51757 g/cm³ approx. 1.19
NCO-content (theoretical) % by wt. 33.6
Heat of fusion J/g approx. 102
Viscosity at 40 °C MDI-01-02 mPa*s 4.1
Specific heat (cp) kJ/(kg*K) approx. 1.39
Purity (mol. wt. 250) MDI-01-01 % by wt. min. 99.5
Freezing point MDI-01-07 °C min. 38.4

Specifications

Property Name Test Method Unit Value
2,4'-isomer content MDI-01-06 % by wt. max. 1.8
Uretdione (dimer) content * MDI-01-08 % by wt. max. 0.1
4,4'-isomer content MDI-01-06 % by wt. min. 98.2
Hydrolysable chlorine MDI-01-04 ppm max. 50
* applies only to the liquid form at the time of delivery

Downloads

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

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