4 inch glass wafers

John Shott shott at stanford.edu
Mon Apr 2 19:42:03 PDT 2012


Kyunglok:

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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