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Allgemeine Charakterisierung

Monomeric diphenylmethane diisocyanate with high 2,4'-isomer content and stabilized against discoloration during storage.
Formulation of prepolymers for use in one- and two-component polyurethane coatings and adhesives and in related applications. Desmodur® 2460 M is an isomeric mixture of monomeric diphenylmethane diisocyanate that is liquid at temperatures above 20 °C. Storage and handling are greatly simplified compared to 4,4' isomer that is solid at room temperature (Desmodur® 44 M, Desmodur® 44 MC).


- Storage in original sealed Covestro container.

- Recommended storage temperature: 20 - 40 °C.

- Protect from moisture, heat and foreign material.

General information: The product is sensitive to moisture and should therefore be stored in its sealed original containers. Prolonged storage at temperatures above 45 °C results in a deterioration in quality as the product becomes increasingly turbid owing to the formation of a sediment (dimers) that is not readily soluble. Storage at too low a temperature results in crystallization which starts at around 15 °C. The storage of the crystallized product above 5 °C must be avoided as this promotes the formation of non-meltable dimers. As a result, the product can no longer be fully melted after around 3 weeks. To prevent crystallization, it must be ensured that the product does not cool to below 20 °C. Upon receipt, samples of the product should be tested for crystallization. If crystallization has occurred during transportation or storage, the product must be remelted immediately. On no account should the temperature during melting (material temperature) exceed 70 °C nor should the time needed to reliquefy the product be exceeded as this will greatly promote the formation of non-meltable dimers. It should be ensured that the entire content of the container is remelted and homogenized. The container must then be closed immediately and its content cooled to and kept at the standard storage temperature (20 – 25 °C). If the product is in a partially crystallized state for a brief period, there will be no significant effect on the product quality. Only the storage stability may be reduced slightly, i.e. remelted product should be used as soon as possible.


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Technische Eigenschaften & Datenblätter

Name der Eigenschaft Prüfverfahren Einheit Wert
Hydrolysable chlorine MDI-01-04 mg/kg max. 50
2,2'-MDI MDI-01-06 % max. 0.8
4,4' MDI MDI-01-06 % min. 39.2
2,4'-MDI MDI-01-06 % 55.0 ± 5.0

Name der Eigenschaft Prüfverfahren Einheit Wert
Density at 25 °C DIN 51 757 g/cm3 1.21
Degree of purity (MG 250) 2011-0248603-94 % by wt. min. 99.5
Phenyl isocyanate content 2011-0489801-95 ppm max. 10
Vapor pressure at 20 °C (MDI) hPa < 10^-5
Viscosity at 25 °C 2011-0313703-95 mPa*s 12 ± 2
NCO content (theoretical) % by wt. 33.6


Technisches Datenblatt
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