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Thread: Failing CA
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28th June 2011, 10:16 AM #1
Failing CA
I recently heard some concerning news about CA glue failing after time (10 yearsish). I am wondering if anyone has had experience with this or any more info on it.
Is it dependent on the quality of the glue (are there better quality CA glues than others?) or is it a matter of how woodturners often use it; ie mixing it with wood dust and using it as a fliller? Are there other factors at play?
Or is it a myth perpetrated by unscrupulous pva glue companies?
It is of concern to me because I do use it as a filler but will stop this practise if I know it wont stand the test of time. I have heard that some collectors, before they buy a piece, ask the question "have you used CA glue?" If so they wont buy it.
An important issue to get to the bottom of, me think.
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28th June 2011, 10:41 AM #2
Interesting thought Brendan.
I'm not 100% sure but it would seem possible - CA does become very brittle and I've found it to be susceptible to shock type movements (eg dropping something). Don't know about it failing because of age though.
Cheers,
Dave
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28th June 2011, 11:17 AM #3
Brendan,
I read way back about ca failures in a USA article but like you said is it rumour
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28th June 2011, 01:43 PM #4
I have also heard the rumors but the proof was not whether it was the application or the applicator that was at fault.
As with all finishes these two reasons are the main fault.Jim Carroll
One Good Turn Deserves Another. CWS, Vicmarc, Robert Sorby, Woodcut, Tormek, Woodfast
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28th June 2011, 04:53 PM #5Hewer of wood
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Have only had one bad batch of bargain shop CA and it failed immediately!
Cheers, Ern
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28th June 2011, 05:25 PM #6
Have heard the same, but have yet to see it myself.
Inspiration exists, but it has to find you working. — Pablo Picasso
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28th June 2011, 05:34 PM #7
Have heard the same and had CA fail on me but not involved with woodwork.
Over the years I have seen and had Epoxy fail various situations. Similar story 10 year life span.
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28th June 2011, 06:14 PM #8
Like others have said, I have heard rumors, perhaps urban myth, but i will watch this thread with interest.
Russell (aka Mulgabill)
"It is as it is"
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28th June 2011, 07:17 PM #9GOLD MEMBER
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Essentially CA is a synthetic polymer, a plastic from the acrylic family (think clear plastic sheets). Considering this I would imagine CA would last a little longer than 10 years. The only situation where acrylic (and CA glue) would degrade is if it would be exposed to prolonged UV radiation (the sun, which is why polycarbonate is better for roofing).
I reckon it's a myth Brendan.
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28th June 2011, 07:42 PM #10
Myth? Sorta.
The thing with ethyl CA - the type most oft used in WW - is it doesn't stand up to moisture/humidity very well. Given certain conditions and enough time, it'll go cloudy and eventually fail.
High (90°Cish) temperatures can also cause it to break down.
However, isn't this true of most other glues - and often the timbers they're used on - as well? Perhaps not those specific factors, but they all have their own particular kryptonites.
Somewhere around here I have a lot of tech info & research on the stuff, but I'm too lazy to hunt it up.
- Andy Mc
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28th June 2011, 10:00 PM #11
I have had no problems with coatings or fillers, but yes I have had failures with glued joints in time. It is a brittle glue, thus if the wood moves, it can give way if there is insufficient bond area. All of the failures I have had were with my early segmental bowls where I had thin walls, failing at a number of joints, after 3-5 years.
Neil____________________________________________Every day presents an opportunity to learn something new
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28th June 2011, 10:57 PM #12
Biggest problem I have with CA is that I fail to use it all before it goes off in the bottle.
Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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28th June 2011, 11:21 PM #13
Cliff,
Do you store it in a fridge? Up here in hot and humid Darwin it lasts a very long time when stored in one.
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28th June 2011, 11:23 PM #14
I have to agree with Cliff. So many tubes have gone off before they were used up.
I am now approaching the age where if it lasts 10 years it will most likely be ok.
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29th June 2011, 06:21 AM #15GOLD MEMBER
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