In 1970 Congress passed the Clean Air Act, which called for significant reductions in auto emissions. The pressure was on to create a new technology to meet the new requirements. Corning answered the challenge in 1972 with the first cellular ceramic substrate. Virtually every automotive company in the world today relies on the basis of Corning cellular ceramic technology to control exhaust emissions.
In 1978 Corning developed a cellular ceramic particulate filter to remove soot from diesel emissions. Both innovations, substrates and filters, are manufactured by the company's patented extrusion process in facilities around the world.