Good thermal and mechanical property, accurate dimensional tolerance.
Twin quartz 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
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
|
not more than 0.01
|
not more than 0.2
|
2.0
|
Physical Properties
|
Density 20°C kg.m-3 (×103)
|
2.2
|
|
Coefficient of expansion 25-300°C °C-1 (×10-6)
|
0.56
|
|
Softening point °C
|
1670
|
|
Annealing point °C
|
1210
|
|
Strain point °C
|
1110
|
|
Youngs modulus Pa
|
7.3×105
|