LOCTITE® 540 is a blue, thixotropic, methacrylate ester acrylic anaerobic sealant designed for sealing core plugs and many other high strength sealing applications where non-migration is desired. It is easily applied with LOCTITE applicators. This product is typically used in applications with an operating range of -65.2 °F to +300.2 °F (-54 °C to +149 °C).