<whitequark>
_Sync_: lookin over some chemical suppliers
<whitequark>
let's say HF for cleaning, how pure should it be? they offer what I think is the grade with <10^-5% of impurities
<whitequark>
less than 2.7e-5% according to the datasheet
<whitequark>
$40/5l
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<whitequark>
hm so that's <270ppb. commercial SEMI grade 2 is <10ppb
<whitequark>
i'm gonna declare that "good enough"
<nmz787>
"This ion mass spectrometer and the associated gas supply manifolds, dry boxes for element storage, control console, and laminar flow hoods at the targets (2) occupies a floor space about 20 ft by 35 ft. A list of components follows, with technical and philosophical discussion for some components."