LOCTITE^® 549 is an orange, medium strength, slow curing, thixotropic dimethacrylate ester gasketing product. The anaerobic sealant cures in the absence of air at room temperature when confined within close fitting metal parts to seal rigid metal faces and flanges. The viscosity is 20,000 mPas and service temperature -55°C to 150°C (-67°F to 302°F).