Baytec® ENC-5003

polymeric MDI; low-functionality polymeric diphenylmethane diisocyanate (PMDI); NCO weight 32.9%; viscosity 26 mPa-s @ 25°C; equivalent weight 127; functionality 2.2; low viscosity, low vapor pressure

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Product Types

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General Characterization

Baytec ENC-5003 is a low functionality polymeric diphenylmethane diisocyanate (pMDI) with a moderately high 2,4’-MDI isomer content.

Storage Conditions

Baytec ENC-5003 isocyanate must be stored in tightly closed containers and protected from contamination with moisture and foreign materials, which can adversely affect processing. It will react with water to form ureas and carbon dioxide gas, which may cause sealed containers to expand and rupture. Recommended storage temperatures are 21° to 30°C (70° to 86°F). Under these conditions, Baytec ENC-5003 will remain clear for up to six months. Within this range, lower storage temperatures will maximize the storage life of the product. Baytec ENC-5003 must not be allowed to freeze. Exposure to temperatures less than 18°C (64°F),can result in the formation of solid material. During the winter months, appropriate precautions must be taken during shipment and storage.
If solids form because of exposure of Baytec ENC-5003 to low temperatures, it may be possible to reliquify the product 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. The use of drum heaters is not recommended since the excessive heating causes dimerization, loss of NCO, and an increase in viscosity. As a result, the re-melted product may be cloudy, and the processing behavior and/or properties of the final product may be affected. Prolonged storage of solid or partially solid Baytec ENC-5003 may result in the formation of MDI dimer in amounts that exceed its solubility in the product at normal storage temperatures. This can make the product unusable.


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Technical Properties & Datasheets


Property Name Test Method Unit Value
NCO content wt.-% 32.1 - 33.1
Acidity wt.-% max. 0.07
Viscosity at 25°C mPa•s 20


Property Name Test Method Unit Value
Specific gravity at 25°C 1.24
Flash point (PMCC) °C > 93
Appearance Brown liquid


Technical Data Sheet
Safety Data Sheet
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