The factors affecting the graphite molds are as follows: 1. Environment: in the air, the oxidation speed will be accelerated with the increase of temperature, thus shortening the service life of carbon graphite molds; In a vacuum, the oxidation speed will be slow and the life can be prolonged. 2. Material selection: because the graphite mould has different functions in the thermal field, the materials used for the graphite molds for sale must be different. In general, the electrode, heater, graphite crucible, insulation cylinder, etc. should be processed with graphite materials with fine structure and high strength produced by isostatic pressing to meet the actual needs of production.