1,quartz tube 2 purity 99.99% min 3,Resistance ... Appearances.. 1. purity : 99.99% min2. Shape : Both ends open/ One end close3. Resistance 1100 degree, 1000 long time work4 ... and 70 speculations, ranging from 3-300mm 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, and so on. ...