1,quartz heating rod: 2 purity 99.99% min 3,Resistance 1100 degree, 1000 ... blackline non-discolouring No black quartz heating rod1, quartz heating rod : 2 purity 99.99% min3,Resistance 1100 degree, 1000 long ... .00mm±1.5% ±14% 15%2.0%3.0mm80.00-100.00mm±1.0% ±0.5mm 15%2.0%3.0mm100 ... -stop quartz tube, red quartz tube, processed quartz tube, quartz rod, quartz plate, gray quartz tube, and so on. And we ...