From the melting of sand to produce clear float glass to the vacuum sputtering of silver to produce low-emissivity coatings, Cardinal Glass Industries manufactures the components and finished insulating glass products used in all lines of residential windows. Founded in 1962, Cardinal Glass Industries is a management-owned corporation that is based in Minneapolis. The company is a leader in the development of durable insulating glass edge seal systems and is responsible for the introduction of thermal-performance improvements for residential glass. Cardinal operates three wholly-owned subsidiaries: Cardinal IG Company (insulating and laminated glass), Cardinal CG Company (coated glass) and Cardinal FG Company (float and tempered glass). Cardinal Glass Industries maintains offices in Rockford, Ill.