Baytec® MP-160

Baytec MP-160 prepolymer 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 15°C to 35°C (59°F to 95°F). Under these conditions, Baytec MP-160 prepolymer will remain clear for periods of up to six months from date of receipt. Within this range, lower storage temperatures will maximize the storage life of this product. Baytec MP-160 prepolymer must not be allowed to freeze. Exposure to temperatures less than 15°C (59°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 Baytec MP-160 prepolymer may result in the formation of MDI dimer in amounts that exceed its solubility in the prepolymer at normal storage temperatures. This can make the product unusable.
If solids should form because of exposure of Baytec MP-160 prepolymer 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. 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.