Ozone Free Quartz Glass Tube Type EN08Ti

EN08Ti is mechanically drawn electrically fused quartz glass tube doped with titanium. It has a cut off at ozone producing line of wavelength 220nm. So it is known as ozone free or ozone-less quartz glass.

EN08Ti is doped from natural quartz sand type N08 which has slightly high impurity, so it can not be employed in application where high purity is needed such as arc tube of high pressure xenon discharge lamps, sun-tanning lamps and so on.

This glass can be supplied in the range between 6mm-90mm outside diameter.

 

Main application is as follows:

In combination with different OH level, it has below main application:

Type OH Application
EN08Ti NB OH≤10ppm low pressure ozone free UV germicidal lamps tube.

 

Chemical Composition:

unit:ppm

Al Li K Na Ca Fe Ti Mg Cu B SiO2
EN08Ti 16.5 2.0 0.63 3.69 1.33 0.61 200 0.14 0.03 0.5

 

Hydroxyl (OH) Content:

Item UB NB EB SB
EN08Ti ≤150 ≤10 no no

 

Thermal Properties:

coefficient of expansion 25-300℃ cm/cm.℃ 5.5 x 10-7
thermal conductivity 20℃ W/m.℃ 1.4
specific heat 20℃ J/Kg.℃ 670
softening point 1670
strain point 1110
annealing point 1200
max. working temperature
continuous
short-term
1160
1300

 

Mechanical Properties:

Young’s modulus Pa 7.2 x 1010
density kg/m2 2.2 x 103
tensile strength Pa 4.8 x 107
compressive strength Pa >1.1 x 109
Poisson’s ratio 0.17

 

Electrical Properties:

loss tangent 20℃ and 1MHz <2 x 10-4
dielectric constant 20℃ and 1MHz 3.75
resistivity 350℃ ohm.cm 7.0 x 109
insulation strength V/m 5.0 x 107

 

Optical Properties:

index of refraction 1.459
transmittance wall thickness 1mm see below form
nm 185 200 220 245 254 320 340 500 800
% <1.0 <1.3 <1.5 83.5 >85.0 89.8 90.2 >91.0 >91.0