Dertophene 1510 Terpene phenolic resin DRT Tackifier >> Terpene >> Terpene phenol ADHESIVE Our terpene phenolic resins are based on an original DRT process specifically designed to improve the adhesion on various substrates when included in an adhesive formulation. Terpene phenolic resin. Used as a tackifier in adhesives. Provides improved adhesion on various substrates.