Lupranat M 20 S 4,4'-Diphenylmethane diisocyanate BASF-Elastogran Polyurethane (PU) - Prepolymers >> Isocyanate >> MDI based Lupranat M 20 S is a solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. The average functionality is 2.7. Lupranat M 20 S is principally used for the manufacture of insulating foams and higher density rigid foams. It is also used for the production of semi-rigid foams in the automotive industry and sound insulation as well as for packaging foams, casting materials, binders and adhesives. Solvent-free product based on diphenylmethane-4,4'-diisocyanate (MDI) containing oligomers of high functionality and isomers. Used for the production of binders.