This clear quartz rod has high purity, elevated temperature characteristics and low coefficient of thermal expansion, It serves as the material of the bridging rod for single and halogen lamps, fiber optic lighting, quartz making, wafer carriers and push rods in semiconductor industry Dimensional Tolerance Range of OD OD d6mm ± 2.0% 6.00-15.00mm ± 1.25% 15.00-20.00mm ± 1.25% 20.00-25.00mm ± 1.25% 25.00-30.00mm ± 1.35% 30.00-50.00mm ± 1.5% Chemical Composition Unit: ppm Cr Ge Fe Mg Ti Ca Al Na Li K OH 0.5 0.5 1.2 0.8 2.0 2.0 20 1.2 0.5 1.5 25 Physical Properties Density 20 kg.m-3 ( × 103) 2.2 Coefficient of expansion 25-300 -1 ( × 10-6) 0.56 Softening point 1670 Annealing point 1210 Strain point 1110 Youngs modulus Pa 7.3× 105