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11523Re: Can of worms question....(long)

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  • mrusson
    Nov 7, 2005
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      Ed,
      You are SO right....i should have bottled all that energy my kids
      have, and told them to smash the crap outta that playwood. :o)
      M Russon





      --- In Michalak@yahoogroups.com, "Ed" <edeinhorn@h...> wrote:
      >
      > 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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