Hyperbranched PAMAM can be used as toughening agent for fast curing epoxy adhesive systems to well improve the impact resistance of adhesive, impact resistance is three times improvement compared with system without hyperbranched PAMAM , best dosage is generally about 2% -3% , and can increase the adhesion properties of adhesive and the metal substrate, adhesion properties improved by 23%.Weihai CY Dendrimer Technology Co. Ltd forwards from "Upgrading the Adhesion Properties of a Fast-Curing Epoxy Using Hydrophilic/Hydrophobic Hyperbranched Poly(amidoamine)s"Hisham A. Essawy, Heba A. Mohamed, Nadia H. Elsayed Department of Polymers and Pigments, National Research Center, Dokki 12311, Cairo, Egypt Correspondence to: H. A. Essawy (E-mail: hishamessawy@yahoo.com)J. APPL. POLYM. SCI. 2013,4505-4514 DOI: 10.1002/APP.38050