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Hi Jas
Pyrex Or plate glass that is about 1 inch thick is the traditional size and type for a 6 inch first mirror. Many people start with an 8 inch of 1 to 1.25 inches thickness.
Most glaziers will get glass up to 3/4 inch thickness and that should be OK too as long as it is properly annealed. Most that I have tried seem to have difficulty cutting the glass to a disk that small. I would recommend purchasing a blank from an astronomy club or an ATM supplier. In that size they are not that expensive. You only need one good blank Make the tool from ceramic tiles and plaster or cement. Or if you can get a disk of plate glass about 1/2 inch thick that will make a good tool too.
There is a mirror making thread that has been stickied in this forum. You may want to post your questions there.
Make sure you check the prices of new mirrors against the cost of making your own. I enjoy making mirrors but I started doing it when the cost saving was significant. That's not really the case now. So do it because the process interests you or because you want the skills to tackle more complex projects later.
Good luck.
Rod
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