Which type of sapphire windows are preferable for mounting on combustion chamber at high pressure & temperature?

The type of sapphire window as Sight window can be practically anyone. But with orientation C- plane. The estimate of thickness is engineering job.

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I would like to know what size tubes you have available, and their pressure rating, I wish to use them as a view pressure vessel, approx 50 - 100ml volume. I would also like some additional information about the preferred method of sealing to 316L stainless steel end plates I need to manufacture. The pressure I am shooting for is approx 350BAR.
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Would it be possible for you to send me a price list for High pressure sight windows?
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Which type of sapphire windows are preferable for mounting on combustion chamber at high pressure & temperature?
We'd like to measure some effects on materials in an oven. The product itself can increase temperatures up to 2000°C. I have no idea about the air temperature of the oven. I want to use sapphire as a window for a cooled thermal imaging camera from 3-5µm. Would Sapphire be the right choise? What is the thickness I should take, or is there a maximum diameter? Is it possible to buy just one or two pieces?

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