Good practice Bruce ; as you said: than it works in store ;
and the result is very variable :
It is commonly known as "rust finger" nickname in toolmakers circles :
when you have a highly polished XYQZ supersteel moulding tool ;
some of the unfortunate fellows are literally banned from work on fishing
stages .
As the body acids do vary (you tell me, coke?, bad wine?, hormones?);
to see fingerprints developing on running tool is expensive business .
Gold I didn't see as critical as osp .
Our guys are trained : hold the edges only (anytime) .
They usually remember that only when I'm around .

PAUL

-----Original Message-----
From: Bruce Tostevin [mailto:[log in to unmask]]
Sent: Wednesday, 8 September 1999 6:06
To: [log in to unmask]
Subject: [TN] FW: Susceptibility of surface finishes to skin oils


> Is anyone aware of data or studies on whether or not, gold and OSP surface
> finishes are more susceptible to surface oils than HASL?   We wear cotton
> gloves at incoming inspection, and on several smt lines,  where we inspect
> and run non-HASL boards.  There is a concern about fingerprint oils
> degrading the finish on an OSP board, which may sit several weeks in
> storage, and the concern with the immersion gold boards is that the thin
> finish is porous, and skin oils might cause nickel oxidation.  Is anyone
> else doing this, or are we overly concerned about the vulnerability of
> these finishes to skin oils?
>
> Bruce Tostevin
> Benchmark Electronics
> Hudson, New Hampshire
>

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