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  • MMDI

Material

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Allgemeine Charakterisierung

Mondur MA 2902 is an allophanate modified
4,4’-diphenylmethane-diisocyanate (MDI).

Lagerungsbedingungen

Mondur MA 2902 diisocyanate must be stored in tightly closed containers and protected from contamination with moisture and foreign materials, which can adversely affect processing. It will react slowly with water to form ureas and carbon dioxide gas, which may cause sealed containers to expand and rupture. Partially filled containers should be blanketed with dry nitrogen.
Storage temperatures should be maintained between 25° to 30°C (77° to 86°F). Under these conditions, Mondur MA 2902 will remain clear for six months. Within this range, a storage temperature above 25°C (77°F) will maximize the storage life of this product.
Mondur MA 2902 diisocyanate must not be allowed to freeze. Exposure to temperatures less than 19°C (66°F), even for short periods of time, can result in the formation of solid material. During the winter months, appropriate precautions must be taken during shipment and storage.
Prolonged storage of solid or partially solid Mondur MA 2902 diisocyanate may result in the ofrmation of MDI dimer in amounts which exceed its solubility in the product at normal storage temepratures. This can make the product unusable.
If solids should form because of exposure to low temperatures, it may be possible to reliquify Mondur MA 2902 by heating. Use a well-ventilated oven for the minimum time necessary to render it clear. The temperature of the product should not exceed 60°C (140°F). Agitation or drum rollers are recommended to avoid excessive local heating, which will degrade the product.
Significant amounts of MDI dimer may form during the heating process. As a result, the remelted diisocyanate may be cloudy, and the processing behavior and/or properties of the final product may be affected.
Mondur allophanate modified diisocyanates may show a noticeable color increase during the shelf-life of the product. This is normal behavior for this material and this changes s ... text to long! (max 2000 characters)

Probenahme

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Verpackungsart

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Technische Eigenschaften & Datenblätter

Name der Eigenschaft Prüfverfahren Einheit Wert
Functionality 2.0
Appearance Light yellow to yellow liquid
Viscosity at 25°C mPa•s 40
Equivalent weight avg. 145
Specific gravity at 25°C 1.20
Flash point PMCC °C 216

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