... high aluminum ceramic pipe 2.95-99.7% aumina purity 3.Voltage resistance, 16-25V 4.magnesium,2 and 4 holes 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 ...