Does the flexure strength of sapphire increase with thickness; for example 0.7 vs. 1.4 mm thick; Is this size and shape and shape dependent? 2" or 3" diameter or 2" or 3" rectangular piece.

Flexure strength is material constant and it can change with temperature, orientation only, but not with thickness. Squares and circular windows have the difference thickness for max pressure. But the difference is not very much.

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Physical properties of synthetic sapphire
I have found information that after special treatment corundum has tensile strength 2 GPa. Can you confirm this information? Who may manufacture such corundum?
The 2 GPa tensile strength of corundum has not been confirmed by anyone else, either. So I will assume that the tensile strength of sapphire monocrystal is 400 MPa. I have further questions: 1) if sapphire is subjected to essentially constant tension of e.g. 350 MPa, does it experience fatigue? 2) Can you make a sapphire plate, whose width is given by a given Gaussian function (maximum e.g. 40 mm in the center), thickness about 1 mm, and length about 200 mm?
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Does the flexure strength of sapphire increase with thickness; for example 0.7 vs. 1.4 mm thick; Is this size and shape and shape dependent? 2" or 3" diameter or 2" or 3" rectangular piece.
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