1,quartz heating rod: 2 purity 99.99% min 3,Resistance 1100 degree, ... time work 4, nonbrowning no blackline non-discolouring No black quartz heating rod1, quartz heating rod : 2 purity 99.99% min3,Resistance 1100 degree ... -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 ...