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Pure MDI is a highortho-para MDI designed for use inpolyurethane adhesives, sealants,sports flooring, coatings, electricalencapsulants and flexible moldedfoams. MDI a liquidmixture composed of approximately50 percent 4,4-diphenylmethanediisocyanate and 50 percent2,4¬â„¢-diphenylmethane diisocyanate.This difunctional product has highpurity, low acidity, reproduciblereactivity and a low vapor pressure. polyisocyanate hardener, polymeric mdi, polurethane mdi MDI, TDI