NILO K has been developed specifically for the production of matched glass-to-metal seals when using hard, borosilicate glass. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: Fe-16. Producer or source: Henry Wiggin & Company Ltd. Originally published August 1959, revised January 1966.