1 resistance high temperature 2 resistance to corrosion 3 Excellent thermal stability 4 Transmittance of good performance 1, tolerance control (min:±0.1) 2, accurate dimension according to customs’ request3, OD:1.3-350mm Thickness:0.6-10mm length:5-3.000mm4, dely used in the filed of semiconductor, metallurgy, chemical industry, electric light source, photo-communication, medical equipment, ...