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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