... ceramic pipe 2.95-99.7% aumina purity3.Voltage resistance, 16-25V4.Fireproof,magnesium,2 and 4 holes 1. Extreme high temperature ... 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 material cost ...