SGL Group invested approximately $1.1 million in the development of its rigid-felt production site in China. Rigid felts based on specialty graphites are used as high-quality insulation materials in industrial inert-gas and vacuum furnaces. They have a wide range of application, including in the metal heat treatment of components for the automotive and aerospace industries and in ceramic sintering processes for the hard-metal industry. In addition to the site in China, SGL Group produces rigid felts at its site in Meitingen, Germany.