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11522Re: Can of worms question....(long)

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  • Ed
    Nov 7 2:48 PM
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      mrusson, I'm shocked. All those kids and you waste a perfectly good anvil...perhaps this
      calls for a contest of sorts...ciao,Ed

      --- In Michalak@yahoogroups.com, "mrusson" <mrusson@g...> wrote:
      > Dear Group,
      > I wanted to ask the groups opinion about PL Premium versus the ever
      > popular Epoxy. After some research into polyurethane adhesives such as
      > PL and 3M 5200, i learned something. After looking into the flexural,
      > adhesion and modular properties of polyurethane, i began to like it a
      > bit more. It was mentioned to me that using a polyurethane adhesive to
      > glue butt blocks or structural areas was a bad idea. After looking into
      > the combination of mechanical fasteners used with PL adhesives, i don't
      > worry so much about the joint. PL exhibits a flexural advantage over
      > Epoxy in that it can absorb blunt flexural impacts and not fracture.
      > Epoxy on the other hand reaches a point where the resin actually
      > breaks. I did a few little tests at home this week and came up with the
      > following. After glueing two pieces of 1/2 AC ply together, with no
      > surface prep, i observed that the PL bond compared to the epoxy bond,
      > actually held up better in a direct impact. I smashed the joints using
      > a 200 pound anvil hung from a ceiling hoist in my garage. The joint was
      > impacted from the side at the same height and weight each time. The
      > epoxy cracked under impact where the PL did not. Surface delamination
      > of the AC ply glued with PL was about as severe as epoxy. I admit this
      > is a low tech test with no real data, but i can definately see the
      > strength associated with Polyurethane adhesives. Food for thought i
      > suppose.
      > M Russon
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