I had an access cover into my gas tank that was held on with pro seal.
I removed it by heating it with a heat gun.  The pro seal started to
give way about the same time the white Emron paint started to
discolor.  I don't know the temp either, but I suspect it was well
below 1000 F. FWIW

Bob W.


On Thu, 21 Jun 2007 13:44:10 -0400
marv@lancair.net wrote:

>
> I don't have any definitive numbers, never needed to measure it.  What I can tell you is that whenever we'd have a guy fail to purge the mixer properly after an application session we had 2 options... if it was a mix tube with plastic mix elements we could usually press them out with a couple tons of push.  If it was an all steel mix tube with an internal steel spiral mix element we'd take a torch to it and get it so the ends of the tube were just starting to color (ie, probably way over 1000dF).  We could then run a piece of coathanger through it to knock out the ash.  Anything less and the stuff wouldn't budge.  Don't ask me how I know.  (actually, there was a 3rd option that required a long soak in methylene choloride... it would penetrate the polysulfide back about 1/4"and make it blow up like a balloon... then we could slowly pick/brush/blow out the pieces.  The process would take 10 minutes here and 10 minutes there over about a week-long period to get all the way through an 8" long mixer...  it is some very tough stuff.)
>
>    <Marv>
>
>
>
>
> keltro@att.net (Kelly Troyer) wrote:
> """
> Marv,Tracy,et al,
> Any numbers on the degrees of heat that Polysulfide or the
> newer Polyurethane can handle without degrading??
> --
> Kelly Troyer
> """
>
>
> --
>
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>
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