The most important and significant properties of the optical glass ceramic ZERODUR® are the extremely small coefficient of linear thermal expansion as well as the homogeneity of this coefficient throughout the entire piece. Individual pieces of ZERODUR® (discs, plates, rods) can be supplied with a mean coefficient of linear thermal expansion α in the temperature range 0°C to 50°C in three expansion classes as follows:
|
Expansion Class 0
|
0± 0.02·10-6/K
|
|
Expansion Class 1
|
0± 0.05·10-6/K
|
|
Expansion Class 2
|
0± 0.10·10-6/K
|
Typical coefficient of linear thermal expansion
Properties
|
Density (g/cm3)
|
2.53
|
|
Young’s Modules E (Gpa)
|
90
|
|
Poisson’s Ratio µ
|
0.24
|
|
Knoop Hardness (HK 0.1/20)
|
620
|
|
Expansion Coefficient a (20° -700°C) (10-6 /K)
|
0.2
|
|
Expansion Coefficient a (0° -50°C) (10-6 /K)
|
0.0 ± 0.1
|
|
Thermal Capacity cp (20°C) (J/(gK))
|
0.80
|
|
Thermal Conductivity 90°C (W/(mK))
|
1.46
|
|
Max. Application Temperature (°C)
|
600
|
WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.
