The source of the requirement for extractive testing was MIL-P-28809
(now obsolete) which in turn referenced testing done by the Navy in
Crane, Indiana.  The odd units used in MIL-STD-2000A are a pure
metrification of the requirements of 28809A.  The difference between 10
micrograms/in^2 and the more commonly thought of 14 units/in^2 have to
do with correction factors applied in MIL-P-28809A to recognize the more
aggressive extraction by new (at the time of 28809A's release in 1981)
automated cleanliness testers.  I would note that the heated testers
used today extract even more aggressively but this effect is only seen
by comparing PWA data (not a NaCl control).

Jim Maguire
===============================
Jim Maguire
Senior Principal Engineer
Boeing Defense & Space Group
PO Box 3999  M/S 3W-97
Seattle, WA  98124-2499
Phone (206)657-9063     Fax 657-8903
Email:  [log in to unmask]
================================

> ----------
> From:         ROBERT MEINERT[SMTP:[log in to unmask]]
> Reply To:     TechNet Mail Forum.;ROBERT MEINERT
> Sent:         Friday, October 03, 1997 9:02 AM
> To:   [log in to unmask]
> Subject:      [TECHNET] MIL-STD Cleanliness spec.
>
>      Hello:  Need someone to point me in the right direction for a
> source
>      of MIL STD 2000A 5.3.5, Cleanliness testing/specification.  Or,
> if
>      that spec. is obsolete, the replacement and/or equivalent.
>
>      thanks,
>      Robert Meinert
>      Hitachi Computer Products
>      Norman, OK
>      405-360-5500 x174
>
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