Loctite 518 is a single component, medium strength, anaerobic sealant which cures when confined in the absence of air between close fitting metal surfaces. Typical applications include sealing close fitting joints between rigid metal faces and flanges. Provides resistance to low pressures immediately after assembly of flanges. - The thixotropic nature of Loctite 518 reduces the migration of liquid product after application to the substrate. Typically used as a form-in-place gasket on rigid flanged connections, gearbox and engine casings, etc.