Epoxy

[Sarah Fox]

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Hi Terry,

Welcome back!  :-)  I hope the storm wasn't too awful!

Actually aliphatic resin glues dry *and* cure.  There is a cross-linking =
of the polyvinyl acetate (PVA) during the drying/curing process.  This =
isn't true of all white and yellow glues, of course -- mostly the =
water-resistant ones, as I understand it.  I don't know what triggers =
this process or how it is catalyzed.  It might be triggered through =
evaporation -- or possibly by exposure to oxygen or carbon dioxide.  =
Dunno.  Anyway, it's a chemical reaction.

Peace,
Sarah

  ----- Original Message -----=20
  From: Farrell=20
  To: Pianotech=20
  Sent: Saturday, October 02, 2004 6:40 PM
  Subject: Re: Epoxy


  I think the more appropiate (or common anyway) term for the chemical =
reaction that occurrs with epoxy is "cure". But perhpaps that is antics =
with semantics. However, if I am not mistaken, glue, such as yellow =
woodworking glue, does not "set" or "cure" or "dry" by a chemical =
reaction, but rather simply the loss of water - it truly "dries". That =
is indeed a chemical process, but not a chemical reaction. Am I wrong?

  Terry Farrell
    ----- Original Message -----=20
    From: Joe Garrett=20
    To: pianotech=20
    Sent: Saturday, October 02, 2004 11:44 AM
    Subject: Epoxy


    Mike said: "DAG when dry. "

    Mike and everyone else! Please reset your thought patterns regarding =
Epoxy. The damned stuff does not "DRY" it sets, (by chemical reaction). =
Glue "sets" by drying. (which is another type of chemical reaction) The =
most problems, encountered, with Epoxy, is thinking of it as if it were =
a Glue. It Ain't!!! Sheesh!
    End of Rant!
    Joe Garrett, R.P.T.
    Captain, Tool Police
    Squares R I
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