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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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?
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