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_Sync_>
whitequark: the most pure you can get, look at certipur vlsi
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_Sync_>
and 270ppb is not enough at all
<
whitequark>
hmmm i wonder how bad would it be
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_Sync_>
every metal ion you get, is a bad metal ion
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_Sync_>
whitequark: we etch everything that needs to be MIF in HF and HNO3 for hours
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_Sync_>
which means, you touch a carrier with your glove or a tweezer?
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_Sync_>
GG, needs to be etched
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_Sync_>
or you touched your wafer with a non plastic tweezer and it has a tempering process after that
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_Sync_>
ooops, got all the nickel out of the stainless all over your wafer now
<
_Sync_>
touching a 5x5mm corner is enough to kill an entire wafer
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