D.E.N 438-A85 Epoxy novolac Dow Chemical Epoxide (EP) >> Phenol & Cresol (Novolacs) ADHESIVE D.E.N.* 438-A85 epoxy novolac resin is a solution of a semi-solid reaction product of epichlorohydrin and phenol- formaldehyde novolac in acetone. D.E.N. 438-A85 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-A85 has multi-epoxy functionality (± 3.6). These additional reactive sites produce tightly cross-linked cured systems. D.E.N. 438-A85 epoxy novolac resin is used alone or in combination with bisphenol-A based epoxy resins in solution formulations where ease of mixing and processing is required. The thermal stability offered by epoxy novolac resins is a widely accepted asset in pre-preg manufacture for electrical laminates where they improve the resistance to hot solder as well as elevated temperature service. They are also used in coating applications where an increased corrosion/ chemical resistance is desired. Adhesives Standard semi-solid reaction product of epichlorohydrin and phenol-formaldehyde novolac. Used for high temperature applications. Produces tightly cross-linked cured systems. Can be used alone or in combination with bisphenol-A based epoxy resins in solution formulations where ease of mixing and processing is required.