clear fused quartz glass tube ,which is produced through the advanced productive technique of continuous smelting method, it has the characteristics of high purity, strong transmission , good thermally stable function, clear surface, low contents of hydroxide radical , it is the first used materials of producing halogen lamp , mercury vapor lamp , metal halogen lamp, the contests of hydroxide radical can be controlled within 20PPM\10PPM\5PPM\2PPM according to the demands of customers.

Dimensional Tolerance

Range of OD OD WT Siding Out of Round Bow/1220mm
≤6mm ±2.0% ±10% 12% 2.0% 2.5mm
6.00-15.00mm ±1.25% ±8% 10% 1.5% 2.5mm
15.00-20.00mm ±1.25% ±10% 15% 1.5% 2.5mm
20.00-25.00mm ±1.25% ±10% 15% 1.5% 3.0mm
25.00-30.00mm ±1.35% ±12% 15% 1.5% 3.0mm
30.00-80.00mm ±1.5% ±14% 15% 2.0% 3.0mm


Chemical Composition Unit: ppm
Al Fe K Na Li Ca Mg Cu Mn Pb B Ti
20 1.0 3.5 3.5 1.0 2.0 0.5 0.3 0.5 ＜0.01 ＜0.2 2.0


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