Lupranat M 20 SB 4,4'-Diphenylmethane diisocyanate BASF-Elastogran PU - Prepolymers >> Isocyanate >> MDI based ADHESIVE Lupranat M 20 SB is a solvent-free product of high reactivity based on 4,4'-diphenylmethane diisocyanate (MDI) and which contains oligomers and isomers of high functionality. The average functionality is about 2.7. The preferred use of Lupranat M 20 SB is for casting materials and for binders e. g. for wood, sand, rock. Solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. Used for binders (for wood, sand, rock).