D.E.R 684-EK40 Epoxy Dow Chemical Epoxide (EP) >> Bisphenol A based SEALANT ADHESIVE D.E.R.* 684-EK40 epoxy resin solution is an ultra high molecular weight solid reaction product of epichlorohydrin and bisphenol-A dissolved in methyl ethyl ketone . D.E.R 684-EK40 epoxy resin solution provides coatings with outstanding physical and chemical resistance properties by solvent evaporation alone. Products formulated with D.E.R. 684-EK40 resins offer the hardness, flexibility, toughness, adhesion and chemical resistance properties of epoxy resins in a convenient lacquer form. D.E.R. 684-EK40 epoxy resin solution has essentially no epoxy functionality but can be crosslinked through the hydroxyl groups along the polymer backbone. Crosslinking materials of the urea, melamine, phenolic and polyisocyanate types may be used. Once cross-linked with hardeners these systems have improved solvent resistance, improved resistance to some chemicals and improved hot-water resistance. Ambient cured thermoplastic coatings based solely on D.E.R. 684-EK40, when properly formulated, can also provide excellent flexibility, moisture barrier properties, and good adhesion to a variety of substrates. Because of the high molecular weight and the hydrogen bonding tendencies of D.E.R. 684, solvent release can sometimes be a problem. Clear films of this resin at a thickness above 25 µm should be force dried to remove traces of solvent and obtain optimum properties. Pigmented films offer improved solvent release, however, optimum properties are obtained by force-drying. D.E.R. 684-EK40 based coatings can be used in maintenance primers and topcoats, flash primers, shop coats, wire enamels, road markers (primers) and as clear coatings for brass, chrome and aluminum. Adhesives Ultra high molecular weight solid reaction product of epichlorohydrin and bisphenol-A dissolved in methyl ethyl ketone . Offers the hardness, flexibility, toughness, adhesion and chemical resistance properties of epoxy resins in a convenient lacquer form. Can be crosslinked by urea, melamine, phenolic and polyisocyanate.