The combination of aramid fibres, mineral filler, graphite and binder is utilised to contribute to the improvement of thermal stability. Tesnit ® Doniflex has very good stress relaxation properties and excellent chemical resistance, which enables low maintenance costs and high gasket safety. Presence of graphite in Tesnit ® Doniflex allows easy cutting and high adaptability to non-even surfaces. Special surface treatment provides simple replacement of the gasket after use. Due to the outstanding chemical and thermal resistance Tesnit ® Doniflex is a suitable choice for application in flanges, valves, pumps, heat exchangers, in construction of power plants, heating systems and for application in the chemical industry.