This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment 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 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/4c/6a/f3/fb/attachment.htm ---------------------- multipart/alternative attachment--
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