HRJ 2355 Butylphenol-formaldehyde novolak resin Schenectady International Tackifier >> Phenolic Rubber - Elastomer (Chloroprene, Butyl …) ADHESIVE HRJ-2355 is a butylphenol-formaldehyde novolak resin supplied in flake form. This resin is primarily designed for use as a rubber tackifier but is also useful in various other applications. Butylphenol-formaldehyde novolak resin. Used as a rubber tackifier. Can be used in various applications.