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


"Martin X. Moleski, SJ" <moleski@xxxxxxxxxxxx> wrote in message
news:13askhsrfbfmi8e@xxxxxxxxxxxxxxxxxxxxx
On Mon, 30 Jul 2007 15:17:28 -0500, Charles & Peggy Robinson
<ccrobins@xxxxxxx> wrote in
<aa508$46ae48f1$cf9b04b4$8736@xxxxxxxxxx>:

Anaerobic? Are you sure? Seems like some can be kicked off by water
and there's oxy in water.

"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>

Marty
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----------------------------------


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

Ed Cregger


.

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