LOCTITE^® 121078 is a green, high-strength retaining compound for bonding cylindrical fitting parts, designed for applications requiring a permanent bond, particularly where strength at elevated temperatures is required. It's typically used for holding gears and sprockets onto gearbox shafts and rotors on electric motor shafts. This medium-viscosity urethane methacrylate acrylic liquid cures when confined in the absence of air between close-fitting metal surfaces. It’s designed to prevent loosening and leakage from shock and vibration. The thixotropic nature of LOCTITE 121078 makes it easy to apply and reduces sealant migration after application. It fluoresces under UV light – great for quality control.