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
"""