Lupranat MR 4,4'-Diphenylmethane diisocyanate BASF-Elastogran Polyurethane (PU) - Isocyanates >> MDI, diphenylmethane diisocyanate Lupranat MR is 4,4'-diphenylmethane diisocyanates (MDI) with high acidity. Lupranat MR is used for the manufacture of prepolymers. They are also used for the production of coatings.