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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About
Product Types
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Material
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General Characterization
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.
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 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.
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
Moisture access should be prevented when taking product samples.
Packaging Type
Desmodur® 44 C Fused can be supplied as a solidified block in large drums ( net weight 225 kg )
Technical Properties & Datasheets
Characteristics
| Property Name | Test Method | Unit | Value |
|---|---|---|---|
| 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 |
| Phenylisocyanate-content | MDI-01-09 | ppm | ≤ 10 |
| NCO-content (theoretical) | % by wt. | 33.6 | |
| Heat of fusion | J/g | approx. 102 | |
| Specific heat (cp) | kJ/kg*K | approx. 1.39 | |
| Viscosity at 40 °C | mPa*s | 4.1 |
Specifications
| 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 |
Downloads
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Technical Data Sheet
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Safety Data SheetNo direct download available, please visit www.productsafetyfirst.covestro.com
