unclej Posted October 11, 2006 Report Share Posted October 11, 2006 ok, not a guitar question but i know a lot of you use ca glue for a lot of applications..inlay, glueing purfling, etc. and i have too..lots of it. and i've never had this happen before and am curious as to what caused it. i make a lot of wood items for sale from jewelry to oil lamps. today i was at my shop and my eye landed on a big ole cow leg bone that i had been saving for some damn reason for the last few years. i cut one end off of it and liked the way it looked shape wise so i cut a 1/4" maybe 3/8" slice. i decided to fill the hole in the center with a variety of sawdust and solidify it with ca glue and then sand it down and see what it looked like. i placed it on a piece of waxed paper and filled it then saturated it with glue. within seconds it started smoking..not a lot but enough to notice. when i picked it up and felt the back and it was warm. i've experienced this warming with epoxies using a catalyst but never with ca glue before. anyone got an idea of what the reaction was or more specifically what caused it? thanks Quote Link to comment Share on other sites More sharing options...
Southpa Posted October 11, 2006 Report Share Posted October 11, 2006 (edited) CA in the bottle is a monomer. When put in contact with moisture it changes into a polymer (the "binding" effect). This reaction also produces some degree of heat. The more moisture CA is in contact with, the faster the reaction. The faster the reaction = more heat given off. This is also the case where accelerators are used. However, its not really noticeable considering the amounts we normally use . ie. sparingly. Your bone wasn't quite totally dried out. And the amount of CA you dumped in had something to do with it as well. When I'm filling larger holes I do it by successive layers and alternately build up glue and filler. Edited October 11, 2006 by Southpa Quote Link to comment Share on other sites More sharing options...
unclej Posted October 11, 2006 Author Report Share Posted October 11, 2006 thanks for a very informative answer! i suspect it was the moisture in the sawdust as opposed to the bone. the bone has been inside my shop for several years and the sawdust was fresh. and i did "dump" a bunch in at one time. again, thanks. Quote Link to comment Share on other sites More sharing options...
postal Posted October 21, 2006 Report Share Posted October 21, 2006 Sizable amounts of CA do get hot when drying. Part of the chemical process.... I'm no scientist, but I've used a lot of CA before, and had larger drops of it on my skin... which also get uncomfortably warm. Quote Link to comment Share on other sites More sharing options...
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