Re: What's the solvent in foam-safe CA?

Don't ever put cyanoacrylate resin on the usually dark red industrial shop
towels common in the US. There may be residual cleaning solvents present in
the towels that will cause the towels to go up in smoke and possibly flame.
I ran into this some time ago using Eastman 910, an industrial version of
the more commonly called "crazy glue"

"daytripper" <day_trippr@xxxxxxxxxxxxxxx> wrote in message
news:6onsa35hhu28s1qsnlfoge00i891qnvcnd@xxxxxxxxxx
On Mon, 30 Jul 2007 17:22:31 -0400, "Ed Cregger" <ecregger@xxxxxxxxxxxxx>
wrote:

"Martin X. Moleski, SJ" <moleski@xxxxxxxxxxxx> wrote in message
news:13askhsrfbfmi8e@xxxxxxxxxxxxxxxxxxxxx
"Generally, cyanoacrylate is an acrylic resin which rapidly polymerises
in
the presence of water (specifically hydroxide ions), forming long,
strong
chains, joining the bonded surfaces together. Because the presence of
moisture causes the glue to set, exposure to moisture in the air can
cause
a tube or bottle of glue to become unusable over time. To prevent an
opened container of glue from setting before use, it must be stored in
an
airtight jar or bottle with a package of silica gel.

"Another important trait is that cyanoacrylate sets quickly, often in
less
than a minute. A normal bond reaches full strength in two hours and is
waterproof. Accelerators such as toluidine trigger setting in two or
three
seconds, with some loss of strength.

"Acetone, which is sometimes found in nail polish remover, is a
commonly
available solvent capable of softening cured cyanoacrylate.
Nitromethane
is also an excellent solvent. Methylene chloride is the most effective
but
is toxic.

"Low temperatures cause cyanoacrylate to become brittle.
Cyanoacrylate's
bonds can be weakened (allowing disassembly) by placing a glued object
in
a household freezer for several hours.

"If applied to cotton, cyanoacrylate undergoes an exothermic reaction
rapid enough to cause minor burns if spilled on clothing, although this
reaction
is not powerful enough to be noticeable unless it involves more
cyanoacrylate than any non-commercial use would reasonably call for."

<http://en.wikipedia.org/wiki/Cyanoacrylate>


Thanks, Marty. I learned something useful today, thanks to you.

Ed Cregger

Yup.

Like, it may not be a great idea to put your winter plane together using
CA -
if you live in the snow belt ;-)

/daytripper


.

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