... in China,with convenient transportation access.Size: OD2mm-30mm1. purity : 99.99% min2. Resistance 1100 degree, 1000 long time work3. ... resistant6. Good thermal stability7. Good transparency for light>90%9. Good electrical insulation10. Special dimension and tolerances are ... 70 speculations, ranging from 3-300mm clear quartz tube(high purity,good heating resistance,low OH), UV-stop quartz tube, ...