Isonate 143L Isocyanate Dow Chemical PU - Isocyanates >> MDI, diphenylmethane diisocyanate >> Modified MDI ADHESIVE SEALANT ISONATE* 143L modified MDI is a polycarbodiimide-modified diphenylmethane diisocyanate. Liquid at room temperature. Used in adhesives and sealants Polycarbodiimide-modified diphenylmethane diisocyanate. Used in adhesives and sealants.