What's the solvent in foam-safe CA?

No cure for that, Charlie.... CA's are anaerobic by design, literally meaning they curee in the absence of oxygen (or air). Over time CA will "gel" in the bottle as it tries to cure.

Dump it....

Bill

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

CR

Bill Fulmer wrote:

On Mon, 30 Jul 2007 15:17:28 -0500, Charles & Peggy Robinson wrote in :

"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."

Marty

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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

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"

Nitromethane

Cyanoacrylate's

On Tue, 31 Jul 2007 04:16:17 -0400, "Chuck" wrote in :

This is genuinely new information for me. The Wikipedia article was the first time I'd seen any warnings about CA and cotton.

Thanks for sharing your experience with us ...

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,