ivory wafers

[MICHAEL MORVAN]

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Tom,
    There are a few different schools of thought concerning the actual =
purpose of the ivory glue wafer. For starters the wafer is a thin piece =
of muslin cloth and this makes the ivory appear white, ivory is =
translucent and the wafer shows through. The wafer also works as a =
medium for holding glue, wood is porous and readily absorbs glue, ivory =
is porous and absorbs glue also. So this wafer holds a fair amount of =
glue to prevent a glue starved joint. Finally some believe that the =
wafer acts as a expansion joint between the ivory and the keystick. I'm =
not to sure this theory of an expansion joint is sound. Keys and their =
tops  do change dimensionally and at different rates with climate =
changes but ivory was and still is today glued on with hot hyde glue. =
Hot hyde glue has excellent creep and rigidity resistance so this =
property lessens that theory if the wafer is saturated with hyde glue. =
Mike Morvan Blackstone Valley Piano
  ----- Original Message -----=20
  From: Thomas Cole=20
  To: Pianotech=20
  Sent: Wednesday, February 02, 2005 1:57 PM
  Subject: Re: Acrilykey vs glue wafers


  Does anybody know why glue wafers are used, other than providing a =
white underlayment? Are they a buffer between the brittle ivory and =
expanding/contracting keystick?

  Tom Cole

  Joe Garrett wrote:

    Acrilykey is not a "glue"! Itr will break down w/age and impact. =
Actually, so will glue wafers! The best glue to use for replacing Ivory, =
is PVC-E that has a lot of Titanium Dioxide, (ultra fine), added for the =
"whitening" effect.
    Best Regards,
    Joe Garrett, R.P.T.
    Captain, Tool Police
    Squares R I
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