Vacuum Windows Thickness Calculation

The window thickness required to withstand pressure differential at opposite sides can be calculated by the following equation:

Thk = √( 1.1 x P x r² x SF/MR),

P = Pressure difference (PSI),
r = Unsupported radius (mm),
SF = Safety factor (4 to 6) (suggested range, may use other factors),
MR = Modulus of rupture (PSI).

For example,  Ge window with diameter 100 mm and unsupported radius 45 mm used in environment with pressure differential of 1 atmosphere should have thickness of ~4.0 mm (safety factor 5).
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M1 and Crystalvision Colorless Sheet Glass
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