Mondur® PF

Mondur PF is typically used in combination with high molecular weight, reactive polyether polyols in the manufacture of high performance flexible elastomers (RIM and cast), and specialty foams (integral skin and semi-flex). Its controlled functionality makes it particularly useful in the manufacture of polyurethane shoe soles and wheels/tires. Mondur PF also has utility in adhesive applications. As with any product, use of Mondur PF in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.

Mondur PF 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 24° to 30°C (75° to 86°F). Within this range, a storage temperature of about 25°C (77°F) will maximize the storage life of this product. Mondur PF 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 Mondur PF prepolymer may result in the formation of MDI dimer in amounts which exceed its solubility in the product at normal storage temperatures. This can make the product unusable.If solids should form because of exposure to low temperatures, it may be possible to reliquify Mondur PF 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. As a result, the remelted prepolymer may be cloudy, and the processing behavior and/or properties of the final product may be affected.The use of drum heaters is not recommended since the excessive heating causes dimerization, loss of NCO, and increase in viscosity. 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.The shelf life is six months after receipt of material by customer, when stored in sealed original containers under conditions stated above.