LOCTITE 518 cures when confined in the absence of air between close-fitting metal surfaces. It is an anaerobic gasketing material designed for use on rigid some metal flanged mating surfaces. Fills gaps up to 0.25mm and forms a flexible, chemical-resistant seal that will not tear or decay. Parts disassemble easily, even after extended service. Features: Semi-flexible, medium-strength anaerobic flange gasket For active and inactive rigid metal flanges Cures through minor surface contamination Gel-type consistency Seals instantly against low pressure