1, 95-99.7% Alumina purity tube, 2, Voltage resistance, 16-25V, 3, available for ... Extreme high temperature stability under reducing, inert and high vacuum condition under high temp. up to 1800C,2, Extreme ... for many applications to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity,6, ... -10 days after receiving the payment Kejia Alumina Ceramic Tube