The substrates bonded with these adhesives, react differently when impacted. TEROSON® EP 5055 is a panel bonding adhesive vs TEROSON® EP 5065 which is an impact resistant structural adhesive. Teroson EP 5065 can absorb a lot more energy and reduce the impact of a crash. An impact resistant structural bonder is usually used in joints, frame rail assemblies, strut tower assemblies and other body structure joints that have critical strength requirements. Additionally the open time (pot life) of TEROSON EP 5055 is 80 minutes; for TEROSON EP 5065 it is 60 minutes.