... made in China.We are a manufacturer of quartz tubes with wellequipped testing facilities and strong technical force.Our factory ... the famous hometown of crystal in China,with convenient transportation access.Size: OD2mm-30mm1. purity : 99.99% min2. Resistance 1100 degree, ... and 70 speculations, ranging from 3-300mm clear quartz tube(high purity,good heating resistance,low OH), UV-stop quartz tube, red ...