Suprasec 2234 Diphenylmethane diisocyanate based prepolymer Huntsman Polyurethane (PU) - Prepolymers >> Isocyanate >> MDI based Used for the formulation of adhesives, coatings and elastomers. Suprasec 2234 Mid-functionality MDI based prepolymer. Multi-purpose product Mid-functionality MDI based prepolymer. Used in the formulation of coatings.