... professional factory We are selling Kovar sheet,Invar sheet,alloy 52 sheet,etc.Controlled Expansion AlloyFor applications where metals ... application, lead frames, especially for glass and ceramic seals. Alloy 42 is also known as Pernifer 42, NILO 42, ... Medical, Lighting, Optical, Telecommunications, Ceramics, Heat Treating, and other high-technology industries.Note: The values in the table are for ...