Desmodur E 28 is a polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI). Properties / Applications: As corrosion-resistant primers, coatings based on Desmodur E 28 polyisocyanate can be formulated to contain zinc as zinc-rich primers that give galvanic protection. To ensure satisfactory intercoat adhesion, recoating intervals must be determined. The high NCO content of Desmodur E 28 also makes it an important curing agent for two-component systems. Desmodur E 28 polyisocyanate is an outstanding material for moisture-curing one-component formulations and is highly recommended to prime and seal porous substrates. Clear formulations of this type are effective dust-binding impregnants as well as sealers for cement and other substrates because they can protect the substrate from chemicals, deicing salt, and mineral oils. Information provided by Covestro |