... 7% Alumina purity, 2, Voltage resistance, 16-25V, 3, available for gas utensils, gas portable stoves. High purity Alumina TubeFeatures:1, Extreme high temperature ... under high temperature,4, High dielectric properties,5, Gas tight for many applications to provide protective atmospheres or high vacuum at high temperature ... , etc.Shipping and Delivery: by air/sea, in 7-10 days after receiving the payment