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Design of Pressure Window
Minimum thickness of a window required to withstand a pressure differential can be calculated by the following formula:
Th = 
Th = thickness, inches
DIA = unsupported diameter, inches
P = pressure differential, psi
MR = modulus of rupture, psi
Modulus of rupture (MR, psi) of commonly used crystals:
| Crystals | MR, psi |
|---|---|
BaF2 |
3,900 |
CaF2 |
5,300 |
CdTe |
3,200 |
CsI |
820 |
Fused Silica |
7,000 |
GaAs |
20,000 |
Ge |
10,500 |
KBr |
160 |
KCl |
340 |
KRS-5 |
4,000 |
LiF |
1,600 |
MgF2 |
7,200 |
NaCl |
350 |
Sapphire |
65,000 |
Si |
18,100 |
ZnSe |
8,000 |
ZnS |
14,900 |
ZnS Cleartran |
8,700 |