Loctite gasketing sealants and compounds loctite 1546958 loctite 5800 seals close fitting joints between rigid metal faces and flanges it cures when it is confined in the absence of air between close fitting metal surfaces it can be used as a form in place gasket on rigid flanged connections and provides resistance to low pressures immediately after assembly loctite 5800s key differentiator is the white material safety data sheet it carries no hazard symbols risk or safety phrases