... ceramic tube 1, 95-99.7% Alumina purity, 2, Voltage resistance, 16-25V, 3, available for gas utensils, Model: High ... and abrasion resistance,3, Chemical corrosion resistance under high temperature,4, High dielectric properties,5, Gas tight for many applications ... to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity,6, Low ...