chemical properties
    Lupranate® MI is a pure MDI product, but contains a higher proportion of the 2,4' isomer than LUPRANATE® MS. The higher 2,4'-isomer makes the MI product liquid at ambient temperature and relatively less reactive. Chemically speaking, the 2,4' isomer is more flexible than the 4,4' isomer, and its functionality is 2.0.

application
   Lupranate® MI provides isocyanate groups in the production of flexible, semi-flexible and microcellular polyurethane foams for the production of adhesives and sealants.

  Basic performance

shipment
     Lupranate® MI is available in tank trucks or non-recyclable steel drums, with a capacity of 250kg per drum. If it is transported by road tanker, the temperature should be controlled between 23°C and 30°C, and the transport temperature in barrels should not be lower than the freezing point. Strong light exposure should be avoided.

store
    Lupranate® MI should be protected from moisture, oxygen and UV light to discolor, but discoloration does not affect product application. The ideal storage temperature is between 23°C and 30°C, at which temperature, avoiding moisture and oxygen, Lupranate®MI can be stored for at least 3 months. Barrels must be kept airtight, and storage tanks need to be nitrogen sealed. If it is left for too long, dimer will be formed to produce suspension and precipitation. When the temperature is lower than 15～20℃, the 4,4' isomer will crystallize and precipitate, which must be heated and melted immediately, and the heating time should be as short as possible. The solid can be melted by heating at 80℃ for 8-12h, but its precipitation temperature is not the same. If the heating time is too long or too high, the melted Lupranate®MI may be cloudy due to the formation of non-melting polymer. Note also that heating and stirring must be uniform because the 2,4' and 4,4' isomers have different crystallization temperatures.
Storage at high temperatures may discolor or form solids that will not melt when heated.
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