5.Tube（alumina insulator and thermocouple protection）

The alumina tubes are widely used in thermocouple protections and some are used in furnaces. We could design both open for two ends, and one open, the other closed.

Also we could 12make with 2 or 4 holes in the tube. The size ranges from 3mm to 100mm for O.D., and the length is from 10mm to 1,300mm. We can also design upon the customers' detailed requirements