... ceramic tube 1, 95-99.7% Alumina purity, 2, Voltage resistance, 16-25V, 3, available for gas utensils, Model: High purity ... Alumina TubeFeatures:1, Extreme high temperature stability under reducing, inert and high vacuum condition under high temp. up ... abrasion resistance,3, Chemical corrosion resistance under high temperature,4, High dielectric properties,5, Gas tight for many ...