Unless we are out of them, we should have Pyrex 7740 wafers in the stock
room as well as quartz wafers. As the 7740 wafers contain sodium, they
will not be allowed in all tools, so it likely depends on what tools you
need to use to make your decision. They are, of course, considerably
less expensive than quartz ... but the quartz wafers have a far broader
range of tools in which they are allowed.
Good luck,
John
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