Standard Tubing

This standard quartz lamp tubing is a kind of clear electrically fused machine-drawn tubing. It has characteristics of excellent visual, thermal, mechanical properties with tight dimensional tolerances. This material is available in a full range between 2mm and 200mm outside diameter. The hydroxyl (OH) content can be adjusted to different levels according to its application.
The spectral transmission from wavelength about 180-220nm usually reflects material purity for clear fused quartz. The presence of some metallic impurities will make the transmission decrease from wavelengths around 180-220nm. As the transmission curves illustrate, due to the presence of the higher content of some metallic impurities such as Fe etc., the transmission is from wavelength 185-220nm which likelihood of ozone generation is much lower. So this material can not be used for making ozone generation lamps.
However, it still has a transmission of over 85% at wavelength 253.7nm which is ideal for making water purifying lamps and other UV germicidal lamps, because these UV lamps emit about 90% of their radiated energy at 253.7nm which makes the peak germicidal effectives occur.
This has a very good transmission at visible light range from wavelength 380-720nm. So this low cost material is accepted world widely for making halogen lamps, high pressure mercury vapor (HPMV) lamps and other lamps of general lighting systems.
The large diameter can also be used in other lower temperature industrial field due to its anti-alkali and anti-acid properties such as chemical industry and lower temperature semiconductor industry etc.
The detailed Application in combination with its different Hydroxyl (OH) content is as follows:
OHApplication
OH≤160PPM Thermo couple; defrost lamps for refrigerator; Halogen lamps for GLS and automobile, water purification and other UV lamps. The large diameter tube can also be used in Chemical and lower temperature semiconductor industry and so on.
OH≤15PPM Quality halogen lamps , low cost HPMV* lamps, low cost MH* lamps.
OH≤5PPM Top quality halogen lamps, quality HPMV lamps, MH lamps
OH≤2PPM MH lamps
Remarks:
  1. UB=Unbaked; NB=Normal Baked; EB=Extra Baked; SB=Super Baked; GLS=General Lighting System; HPMV=High Pressure Mercury Vapor; MH=Metal Halide.
  2. Wavelength: Vacuum UV=10-200nm UV-C = 200-280nm UV-B= 280-315nm UV-A = 315-380nm Visible Light =380-720nm