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DESMODUR® 44 M FLAKES

DESMODUR 44 M FLAKES 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

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Material

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General Characterization

DESMODUR 44 M FLAKES 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

Storage in original sealed Covestro containers.
Recommended storage temperature: < 5 °C
Protect from moisture, heat and foreign material.

Covestro represents that, for a period of 3 months 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 FLAKES 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 FLAKES. It is therefore advisable to store liquid DESMODUR 44 M FLAKES under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.
DESMODUR 44 M FLAKES 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 FLAKES 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, storag ... text to long! (max 2000 characters)

Sampling

Moisture access should be prevented when taking product samples.

Packaging Type

No data available

Technical Properties & Datasheets

Specifications

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

Downloads

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

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