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Materialklassen

  • MDI
  • Aromatisches Polyisocyanat

Material

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Allgemeine Charakterisierung

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.

Lagerungsbedingungen

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.

Probenahme

Moisture access must be prevented when taking product samples.

Verpackungsart

Drums, IBCs, tank containers and tank wagons.

Technische Eigenschaften & Datenblätter

Name der Eigenschaft Prüfverfahren Einheit Wert
Density at 20 °C DIN 51757 g/cm³ approx. 1.23
Phenyl isocyanate content 2011-0489801-95 ppm ≤ 50
Specific Heat (cp) kJ/kg.K approx. 1.51
Coefficient of thermal expansion K-1 6.59X10-4

Name der Eigenschaft Prüfverfahren Einheit Wert
NCO content MDI-01-01 % by wt. 30.50 - 32.50
Acidity (HCL) MDI-01-03 mg/kg ≤ 200
Viscosity at 25 °C MDI-01-02 mPa·s 160.0 - 240.0

Downloads

Technisches Datenblatt
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Sicherheitsdatenblatt
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