D.E.N 438 Epoxy novolac Dow Chemical Epoxide (EP) >> Phenol & Cresol (Novolacs) ADHESIVE D.E.N.* 438 epoxy novolac resin is a semi-solid reaction product of epichlorohydrin and phenol-formaldehyde novolac. D.E.N. 438 epoxy novolac resin is a general purpose, widely used epoxy novolac resin. It is recognized as a standard for high temperature applications from which variations have been developed. D.E.N. 438 resin has multiepoxy functionality (±3.6). These additional reactive sites produce tightly cross-linked cured systems. This makes D.E.N. 438 epoxy novolac resin useful in adhesives, structural laminates, coatings and castings for elevated temperature service. The thermal stability of a phenolic backbone with the reactivity and versatility of a bisphenol-A epoxy resin are combined in D.E.N. 438 epoxy novolac resin. Laminates can be made using D.E.N. 438 epoxy novolac resin in combination with mica, synthetic glass-fiber or fiberglass reinforcement. Adhesives Semi-solid reaction product of epichlorohydrin and phenol-formaldehyde novolac. Used in adhesives and in high temperature applications. Produces tightly cross-linked cured systems.