CA Glue

[John Delmore]

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As to the first point, Susan, NO!! (Thankfully!)  To quote a Ph.D. in =
the
field (I'm more food/flavor chemistry):
=20
Cyanoacrylate glues contain the group H2C=3DCH-CN: Where the =3D =
represents a
double bond between two carbons and there is a triple bond between the
carbon and nitrogen of the CN. CN is the 'cyano' group, and a =
three-carbon
chain with a double bond next to another type of multiple bond (or some
other form of electron rich group such as a radical or anion) is an
'acrylic' group -- the combination gives a relatively high reactivity to =
the
compounds and allows them to polymerize like a plastic. Many non-toxic
compounds contain both types of groups, and many medicines have cyano
groups. Along with this group, there are other chemicals and can be =
other
chains attached to that cyanoacrylate group in place of one or more of =
the
hydrogens.=20
There is NO, NONE, NADA cyanide released on curing these glues and
hardening. There are some obnoxious fumes released -- some of them just
parts that boil out from the heat of the curing reaction. BUT, whenever =
an
organic chemical that contains nitrogen is burned, some =
cyanogen/hydrogen
cyanide is released. This happens with tobacco, meat, veggies, fireplace
wood, etc. This release is worst when there is not enough oxygen present =
in
the burning zone to ensure complete combustion -- so if there is a lot =
of
smoke formation, there is more likelyhood of cyanide formation.
Sorry if that's more chemistry than you wanted, but I think it makes the
point.  Watch out for smoking rags, etc!=20
To the "kicker" issue, I assume that's an accelerant?  Anything with =
water
(a VERY WEAK lye solution would be better) is going to work.  Elmer's =
may
just be getting in the way of the polymerization.  How is the smell
irritating (acrid, ammonia, etc)?  That may give some indication of =
what's
going on.=20
John Delmore
=20
  _____ =20

From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf
Of Susan Kline
Sent: Wednesday, August 17, 2005 3:28 PM
To: Pianotech
Subject: RE: CA Glue
=20
At 01:54 PM 8/17/2005 -0500, you wrote:



The CA glues themselves have very low toxicity.  And although some =
companies
(Sur-Lok, for one) market their products as =13solvent free=14, most are =
99%
methyl or ethyl cyanoacrylate (butyl and octyl cyanoacrylates are used =
for
surgical closures, an indication of their low toxicity!).  Of the two, I
would look for one that is ethyl cyanoacrylate, as a little safer than =
the
methyl.  Maybe fewer fumes.  But the fumes, though not terribly toxic, =
are
irritants.  So keep up with the ventilation.  As for safety, anything =
that
works this good, ya gotta be careful with!

John Delmore

This is very interesting, John. I've heard rumors that while curing CA =
glue
can emit small amounts of cyanide? Is this true?=20

Also, can you tell us what is so very irritating about the kicker? One =
smell
and I decided not to use it. And is the bond stronger or weaker if the =
glue
is "kicked"? I "kick" by using it along with white glue (Elmer's), but =
the
effect seems much less violent than the spray-on kicker which is sold =
for
the purpose.=20

Thanks for letting us pick your brains ...=20

Susan Kline=20

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