A: Hazy prepolymers are most often caused by one of two reasons: the presence of MDI dimer in the starting isocyanate or the reaction of the isocyanate with moisture. For a smaller-scale operation, MDI is delivered in drums at ambient temperature. It is a solid with a melting point of 39
Q&A About Polyurethanes
July 1, 2010
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Q: Our company recently began making custom prepolymers based on 4,4’-MDI
(diphenylmethane diisocyanate). We are working on a drum scale during this
startup phase and have noticed that our products have a hazy appearance. What
is causing this problem?
A: Hazy prepolymers are most often caused by one of two reasons: the presence of MDI dimer in the starting isocyanate or the reaction of the isocyanate with moisture. For a smaller-scale operation, MDI is delivered in drums at ambient temperature. It is a solid with a melting point of 39
A: Hazy prepolymers are most often caused by one of two reasons: the presence of MDI dimer in the starting isocyanate or the reaction of the isocyanate with moisture. For a smaller-scale operation, MDI is delivered in drums at ambient temperature. It is a solid with a melting point of 39
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