Lupranat M 20 FB 4,4'-Diphenylmethane diisocyanate BASF-Elastogran PU - Prepolymers >> Isocyanate >> MDI based ADHESIVE Lupranat M 20 FB 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. Lupranat M 20 FB is intended for use as a wood binder. Its high reactivity allows rapid demoulding of pressed panels. Solvent-free product based on 4,4'-diphenylmethane diisocyanate (MDI) containing oligomers of high functionality and isomers. Used as a wood binder.