ULE™ Ultra Low Expansion Glass
Special Properties
- Very low thermal expansion
- High temperature shock resistance
- High operating temperature
Typical Applications
- Ultra Low Expansion Substrates
- Length-Standards
- Lightweight Honeycomb Mirror Mounts
- Astronomical Telescopes
- Precision Measurement Technology
- Laser Cavities
Ultra Low Expansion titanium silicate glass ULE™ is made by flame hydrolysis. ULE raw material from Corning comes in large blocks (boules), which allow the manufacturing of components with almost any shape or dimension. ULE is characterized by superior dimensional stability, which results from the essentially zero expansion at room temperature. The homogeneity of CTE of ULE within each boule is typically less than 15 ppb/°C, radially and axially. Measuring of the CTE of ULE can be done by a non-destructive ultrasonic method. ULE is used in many different applications of space technology, astronomy, precision mechanical machines lasers and many more. ULE components with dimensions of only some millimeters, up to several meters can be made of this extraordinary glass material.
Specifications of ULE Ultra Low Expansion Glass*
Show transmission curve of ULE
Refractive Index
- nD = 1,4828 (589nm)
nF = 1,4892 (486nm)
Density
- 2,21 g/cm3 (25°C)
Coefficient of Thermal Expansion (5-35°C)
- 0 ± 0,10 x 10-9/K
- CTE Maximum Variation (5-35°C):
±30 x 10-9/K - Show curve of thermal expansion
Thermal Properties
- Softening Point : 1490°C
- Annealing Point : 1000°C
- Strain Point : 890°C
Chemical Properties
Solution |
Duration of Test
|
Weight Loss |
|---|---|---|
| 5% HCl |
|
< 0,01
|
| 5% NaOH |
|
0,90
|
| 0,02N Na2CO3 |
|
0,02
|
| 5% H2SO4 |
|
< 0,01
|
| H2O |
|
< 0,01
|
Electrical Properties
- Dielectric Constant:
3,99 (100Hz ; 25°C) - Loss Factor:
0,00005 (100Hz ; 25°C)
Flatness
Surface Quality
*Please consider the "Notes on technical specifications"
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