Transparent high temp material needed

i need to design and manufacture a transparent window in batches of a
few hundred at a time apporox 30mm x 20mm x 5mm thick, in either a
plastic or a glass material. The problem is that it will need to
withstand short periods at temperatures of 280 centigrade.
What materials are commercially available and suitable for this
application ?
thanks for your help
Reply to
mik
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