Model Forum / Radio Controlled / Air Models / July 2007

"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

Sho' nuff....  The water shields it from the air...

To really see it kick in the absence of air, try a drop betwixt forefinger
& thumb pressed to gether...:)  That's why they call it "ZAP!"

Cheers,

Bill