... 5. non-discolouring photovoltaic use Clear quartz glass rod at competitive price1, quartz glass rod2,tight siz tolearance3,Resistance 1100 degree, ... cc)Density20 °C kg.m-32.2Degree of Hardness Moh’s Scale5.5-5.6Softening point(degree)1683Annealing point1215Defoamation Point1120Useful: ... 70 speculations, ranging from 3-300mm clear quartz tube(high purity,good heating resistance,low OH), UV-stop quartz ...