Let's hear it for SANITY!!!

-----Original Message-----
From: Steve R Mikell [mailto:[log in to unmask]]
Sent: Thursday, December 03, 1998 9:06 AM
To: [log in to unmask]
Subject: Re: [TN] Q on Ion Chromatography


I've enjoyed all the wonderful technical analysis regarding the
differences
between Ion Chromatography and NaCl equivalence, which comes from the
bulk
ionic conductivity "process control" procedure.  Many past discussions
and
research projects have established that the bulk ionic process control
is NOT
a quantitative lab methodology, but more akin to using a piece of
hanging rope
as a weather forecasting tool.

The NaCl pass fail was devised in 1972, and as such, doesn't really
apply to
today's designs.  Some of the ion species being detected in your IC
tests do
not contribute to field failures.  Many field failures occur at chloride
levels that pass the bulk ionic.

If some customer has blindly imposed this spec on you, you need to
educate him.

If your fellow employees have imposed this requirement, you need to
challange
the validity and develop a test and limit that provides real value to
your
company and its customers.

Does anyone want to offer a sane set of limits to be imposed on
components
based on IC testing???
Doug and Terry @ CSL, are you listening? anybody else?

Sorry, but I had to rant.
Steve Mikell
SCI P13

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