Substrates primarily of ceramic, silicon and non-metals for electrical or thermal insulation of solar cells, photovoltaic cells, and solar collectors; Sheets of graphite-based material for use as gaskets, seals, packings, and heat insulators; Graphite sheets for insulation; Gaskets for industrial use; Gaskets for heat exchangers; Extruded construction forms for insulation; Electrical insulating materials; Electrical ceramic insulators