... , Alumina tubing, thermocouple protection tube,Alumina products,Alumina,Alumina ceramic tube Alumina tubes are widely used in ... make with 2 or 4 holes in the tube. The size ranges from 3mm to 100mm ... detailed requirements.Selection of a variety of high-quality ceramic materials, hot, dry-pressed or injection molding ... thermostat used in ceramic-top column. Funace tube OD25~3031~4041~5051~6061~7071~8081~9091 ...