Alumina tubes, Alumina ceramic tubes, Alumina tubing, thermocouple protection tube,Alumina products,Alumina,Alumina ceramic tube Alumina tubes are widely used in thermocouple protections and some are used infurnaces. We could design both open for two ends, and one open, the other closed.Also we could make with 2 or 4 holes in the tube. The size ranges from 3mm to 100mm for O.D., and the length is ...