Loctite 128068 CR is a purple anaerobic flange sealant supplied in a 300 ml cartridge for sealing rigid metal flanges. It cures in the absence of air between mating metal surfaces and holds across an operating range of -55 to 150 degrees Celsius. The sealant belongs to Henkel's Loctite range of gaskets, sealants and adhesives and is manufactured in Ireland.