Desmodur® 44V20L
About
Product Types
- MDI
- Aromatic polyisocyanate
Material
No data available
General Characterization
Desmodur ® 44V20L is a dark-brown, liquid blend of diphenylmethane-4,4'-diisocyanate (MDI) with isomer and homologues of higher functionality. It is used in conjunction with polyols to produce rigid polyurethanes foam.
Storage Conditions
Recommended storage temperature: +10 to +300C
Storage stability (ex works): 6 months if stored in moisture-tight drums
General information:
Desmodur ® 44V20L may undergo partial crystallization at temperatures below 00C.The product can ,however, be brought back into the liquid state by heating the entire contents of the drum for short time to a maximum of 700C, although this may lead to an increase in the solids content.Drums - including empty ones-should always be kept tightly sealed. The product should never be allowed to come into contact with water,which reacts with Desmodur ® 44V20L to form polyureas and carbon dioxide. Contact with water in any form (damp drums, solvents containing water, moist air)must be prevented not only during storage, but also when removing material from drum and during processing. Failure to do so may lead to a dangerous build-up of pressure in tanks and drums due to the generation of carbon dioxide. In addition, polyureas forming in Desmodur ® 44V20L can cause solids to separate out, leading to blockages in the filters, pumps and pipelines of the processing equipment and resulting in production problems.
Sampling
Packaging Type
Technical Properties & Datasheets
Characteristics
Property Name | Test Method | Unit | Value |
---|---|---|---|
Specific Heat (cp) | kJ/kg.K | approx. 1.51 | |
Coefficient of thermal expansion | K-1 | 6.59X10-4 | |
Density at 20 °C | DIN 51757 | g/cm³ | approx. 1.23 |
Phenyl isocyanate content | MDI-01-09 | ppm | ≤ 50 |
Specifications
Property Name | Test Method | Unit | Value |
---|---|---|---|
NCO content | MDI-01-01 | % by wt. | 30.50 - 32.50 |
Viscosity at 25 °C | MDI-01-02 | mPa·s | 160.0 - 240.0 |
Acidity (HCL) | MDI-01-03 | mg/kg | ≤ 200 |
Downloads
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Technical Data Sheet
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Safety Data SheetNo direct download available, please visit www.productsafetyfirst.covestro.com