... performance , long service life , low maintenance MATERIAL: Extruded Graphite,Molded Graphite,Isostatic Graphite,Vibration Graphite,High density and high Flexural Strength graphite material ... . (Die molded graphite),High pure extruded graphite,Special carburizing treatment graphite materialCHARACTERISTIC :1.perfect sealing performance , long service ...