The expanded graphite packing by the ex0anded graphite yarn the carbon comtent is more than go per cent. It has various properties of expand gra0hite and high general-purpoes performance fine flexibility. intensity, bent-breaking resistance, So far it is the sealing product that gathers the most merits. It is widety used in the steam valves of power plant. or as static chemical corrosion prevails(except comcentrated sulphuric acid of strong oxidzing agents)