Hi Jarrod. There are a few alternatives to Pyrex glass but it all depends on what size mirror you want to make. It also depends where you are. If you are in the US then Pyrex isn't that expensive and compared to the trouble you might have with other type of glass I think that it would be unwise to try an alternative. If you live in Australia then you might try an alternative like plate glass. I have heard of people making mirrors out of porthole glass but not here in Australia. Might be able to give you better advise if I knew where you are and what size you are contemplating.
Regards Cristian
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