1,quartz glass rod 2 tight tolearance 3,Resistance 1100 degree 4 ... Appearances5. Strong Corrosion-resistant6. Good thermal stability7. Good transparency for light>90%9. Good electrical insulation10. Special dimension and tolerances ... clear quartz tube(high purity,good heating resistance,low OH), UV-stop quartz tube, red quartz tube, processed quartz tube, quartz rod, quartz plate, gray quartz tube, ...