• Adhesives

Desmodur® LS 2424

Monomeric diphenylmethane diisocyanate isomeric mixture with high 2,4'-isomer content. Desmodur® LS 2424 is an isomeric mixture of monomeric diphenylmethane diisocyanate that is liquid at temperatures above 20 °C.

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Product Types

  • PIC
  • MDI
  • Aromatic polyisocyanate
  • Polyisocyanate
  • Polyisocyanurate
  • Isocyanate



General Characterization

Monomeric diphenylmethane diisocyanate with high 2,4'-isomer content.
Formulation of prepolymers for use in one- and two-component polyurethane coatings and adhesives and in related applications. Desmodur® LS 2424 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 Conditions

- Storage in original sealed Covestro container.

- Recommended storage temperature: 20 - 30 °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 to low temperature results in crystallization, which starts at around 15 °C. The product tends to discolor (yellow to red) on contact with air and exposure to light during storage, but this does not appreciably affect quality. 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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Packaging Type

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Technical Properties & Datasheets


Property Name Test Method Unit Value
NCO content (theoretical) % by wt. 33.6
Phenyl isocyanate content 2011-0489801-95 ppm max. 10
Density at 25 °C DIN 51757 g/cm3 1.21
Vapor pressure at 20 °C (MDI) hPa < 10^-5
Viscosity at 25 °C 2011-0313703-95 mPa*s 12 ± 2
Degree of purity (MG 250) 2011-0248603-94 % by wt. min. 99.5


Property Name Test Method Unit Value
2,4'-MDI MDI-01-06 % 55.0 ± 5.0
4,4'-MDI MDI-01-06 % min. 39.2
2,2'-MDI MDI-01-06 % max. 0.8
Hydrolyzable chlorine MDI-01-04 mg/kg max. 50


Technical Data Sheet
Safety Data Sheet
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