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From: email@example.com (Bob Wilson)
Subject: Re: Side effects of potting compound !
Date: Thu, 07 Nov 2002 05:27:41 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
In article <firstname.lastname@example.org>,
>I also ran some tests many years ago on acetic acid RTV (at Heart
>Interface). I had heard many reports of corrosion caused by it and Heart
>were using it on one of their main PCBs.
Hmmm. Heart Interface, eh? I was with Statpower. We were both swallowed by
Mussadiq's delusions of grandure when he (at Xantrex) bought all the big
inverter players. Unfortunately, they are not doing all that well not. Lots
of sales, but very poor profit (and lousy moral).
>The only way I could produce any corrosion on copper (wire
>and PCB tracks) was to slow the curing process right down by almost sealing
>it in a bag with very little moisture ingress. After several days (as in
>about 10) *very* slight corrosion started to appear.
This was also my own experience. In theory, none should appear at all since
a) copper is unaffected by common acids, and b) there should be no water
present to ionize the acetic acid produced. But of course, nothing is
>Allowing it to cure in free air produced *no* corrosion whatsoever so
>matter what else was done.
Exactly. Unfortunately, too many people forgot their Grade 9 science, and
got scared when they heard that normal RTV generates acetic **ACID**
>We also tried the same thing on aluminium and a few other metals.
>The conclusion was that perhaps it *was* possible to corrode copper with
>RTV (and hence the scare mongering about it when it first started being
>used) but that one had to do something really stupid in order to achieve
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