Lupranat M 20 R 4,4'-Diphenylmethane diisocyanate BASF-Elastogran PU - Prepolymers >> Isocyanate >> MDI based ADHESIVE Lupranat M 20 R is a solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. It has relatively low reactivity, the average functionality is about 2.7. Lupranat M 20 R is used for the production of insulating foams, casting material, binders and adhesives. Solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. Used for the production of adhesives.