17 Insulating materials; Flange gaskets; Rubber gaskets; High temperature insulators for industrial purposes; Insulation and barrier articles and materials for industrial purposes; Sealing and insulating materials; Rubber gaskets for commercial vehicles; Insulating materials for insulation against heat in industrial use; Gaskets in the form of sheets for industrial use; Gaskets in the form of sheets for use in internal combustion engines; Gaskets in the form of rings for industrial use; Gaskets in the form of rings for use in internal combustion engines; Cylinder jointings