It is made by cutting or stamping pure graphite plates or graphite plates reinforced with metals (such as tooth plates, flat plates, and wire meshes), and it has numerous outstanding sealing properties, such as thermal stability, self-lubrication, corrosion resistance, non-aging, and non-cracking. It can be used stably for a long time under harsh working conditions and requires very little maintenance. It is widely applied and can be processed into inner flange, outer flange, and both inner and outer flanges according to customer requirements to meet different pressure and temperature requirements.