Re: Question regarding using epoxy or RTV on PCBs

On 2006-12-18, Rich Grise <rich@xxxxxxxxxxx> wrote:
On Mon, 18 Dec 2006 02:19:45 +0000, Robert Baer wrote:
D from BC wrote:

I just use whatever clear silicone is at the hardware store. I
do smell the acetic acid in silicone.
Did you know you can make copper bright and shiney in vinegar?
Vinegar has acetic acid..
So I wasn't worried too much about home silicone containing some
"Alien" acid that would eat through the floor.
If there are corrosives in the RTV..the reactivity I believe is
limited and reduces to nothing after cure. Some microscopic
copper loss can be tolerated.
I don't like the RTV slow cure time and the hot glue suggestion
below from another poster is something I use frequently.

"After cure" is a mistake!!!
The stuff is always curing, even months after application!
That is why it is vital to use the Silicone II which does not
generate acetic acid.
Acetic acid will attack everything; the resulting corrosion will be
impossible to stop and the circuit will not last or be repairable
afterwards.

I know there must be something RTV-like that's non-corrosive, because
I saw a lot of it used to fasten down components in military stuff,
back in the 1970's.

dow corning has a number of electronics targeted milspec silicones....

It makes it a real bitch to replace the component, by the way. ;-)

cut it off with a chisel?

Bye.
Jasen
.

Relevant Pages

  • Re: Question regarding using epoxy or RTV on PCBs
    ... do smell the acetic acid in silicone. ... Did you know you can make copper bright and shiney in vinegar? ... Vinegar has acetic acid.. ... So I wasn't worried too much about home silicone containing ...
    (sci.electronics.design)
  • Re: Question regarding using epoxy or RTV on PCBs
    ... Did you know you can make copper bright and shiney in vinegar? ... Vinegar has acetic acid.. ... So I wasn't worried too much about home silicone containing some "Alien" acid that would eat through the floor. ... That is why it is vital to use the Silicone II which does not generate acetic acid. ...
    (sci.electronics.design)
  • Re: Broken large ceramic Rs in combos
    ... I usually stabilise them with a squirt of high temp hot melt glue, ... silicone bath sealer works also. ... It just takes longer to set and they might be a slight risk of corrosion from the acetic acid, tho having said that, I`ve seen whole pcb`s potted in the stuff. ... I don't remember the original stuff we used to get from RadioSpares having an acetic acid smell - but I could be mistaken, it was a long time ago. ...
    (sci.electronics.repair)
  • Re: Question regarding using epoxy or RTV on PCBs
    ... I just use whatever clear silicone is at the hardware store. ... do smell the acetic acid in silicone. ... Did you know you can make copper bright and shiney in vinegar? ... Vinegar has acetic acid.. ...
    (sci.electronics.design)
  • Re: Question regarding using epoxy or RTV on PCBs
    ... do smell the acetic acid in silicone. ... Did you know you can make copper bright and shiney in vinegar? ... Vinegar has acetic acid.. ... So I wasn't worried too much about home silicone containing some ...
    (sci.electronics.design)
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