Lupranat VP 9283 4,4'-Diphenylmethane diisocyanate BASF-Elastogran Polyurethane (PU) - Prepolymers >> Isocyanate >> MDI based Lupranat VP 9283 is a solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI). It contains oligomers of high functionality and isomers. The average functionality is 2.3. Lupranat VP 9283 is mainly used for the production of binders, adhesives, coatings, and casting materials. Solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. Used for the production of binders and coatings.