... ceramic tube 1, 95-99.7% Alumina purity, 2, Voltage resistance, 16-25V, 3, available for gas utensils, gas portable Model: High ... ,3, Chemical corrosion resistance under high temperature,4, High dielectric properties,5, Gas tight ... to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity ... the payment Kejia High Temperature Alumina Ceramic Furnace Tube