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4hv.org :: Forums :: Chemistry
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melting point of superglue

Author Post
EEYORE
Fri Mar 03 2006, 12:26AM Print View
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
hello all, i was wondering if anyone here knows what point superglue melts. I have glued some capacitors together and wish to separate them. 500F definalely did it but also did my capacitors too,oops!

Thanks,
Matt
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...
Fri Mar 03 2006, 12:32AM
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Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2377
I don't think it does
I have two experiences with hot super glue...
One of them is when I glued the top cap onto an 811a tube, and it does not even start to stink at temperatures close to the mp of solder (the envelope is hot enough to so so).
The other was a cap that had some ca on the leads, and as I was soldering it I couldn't figure out why the solder wouldn't stick, until I got hit by a cloud of ca fumes Man that was nasty, my eyes were watering for like 5 minutes.

Good Luck!

Could you try acetone?
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EEYORE
Fri Mar 03 2006, 06:37AM
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
... wrote ...

I don't think it does
I have two experiences with hot super glue...
One of them is when I glued the top cap onto an 811a tube, and it does not even start to stink at temperatures close to the mp of solder (the envelope is hot enough to so so).
The other was a cap that had some ca on the leads, and as I was soldering it I couldn't figure out why the solder wouldn't stick, until I got hit by a cloud of ca fumes Man that was nasty, my eyes were watering for like 5 minutes.

Good Luck!

Could you try acetone?


I tried acetone and rubbing alcohol, neither worked...at all...I tried baking them, just killed the caps(split open)...Sigh, they are no good to me...I guess ill just get some more...

Matt
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Eric
Fri Mar 03 2006, 09:20AM
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Joined: Thu Feb 09 2006, 07:42AM
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Posts: 116
Acetone does work, it just needs a little time. I seperated some stuff I had glued together by soaking in a bottle of acetone overnight. In the morning it had all fallen apart.
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cbfull
Fri Mar 03 2006, 04:59PM
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Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
I tried supergluing some plastic parts together once that were constantly exposed to steam. The glue would only hold in the beginning, and then it would spread out leaving a white residue, and no more bond. Perhaps the high temp/humidity combination destroys the bonds?

I was going to suggest blowing steam on the bond for a couple of hours, but I can't say that the moisture would be good for the caps.
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4ensic
Fri Mar 03 2006, 07:00PM
Registered Member #278
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I don't know how the caps would handle it, but Sirchie has a great cyanoacrylate cleaning solution. You might try it!

Link

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joshua_
Mon Mar 06 2006, 12:09PM
Registered Member #61
Joined: Thu Feb 09 2006, 05:50AM
Location: Mountain View, CA
Posts: 43
..., you got very lucky. Don't ever experiment with melting or vaporizing superglue, and don't use it in any application in which it might possibly melt or vaporize. The fumes are very very toxic (as I recall, part of it is cyanide gas). Be very very careful.

Acetone is probably what I'd suggest -- keep swabbing it and poking at it and brushing it, and it should dissolve.

(...along with the varnish on your table.)
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Dr. Shark
Thu Mar 09 2006, 09:12AM
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Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Just a little theoretical note here: Unlike other glues, superglue does not work by evaporation of a solvent, but by a chain reaction which goes by the name of polymerisation. This means that once superglue hardens, it turns into one single big messy molecule, and neither heat nor solvents will neccecarily undo this reaction. Heat will eventually break down (not melt) superglue, but lots of nasty fumes will be released.
Conclusion: Dont even try, just get it apart mechanically. Thats what works for me.
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Bored Chemist
Fri Mar 10 2006, 07:04AM
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 913
The solvent doesn't need to undo the reaction. Acetone is a fairly good solvent for the polymer.
Heat undoes the reaction pretty well. IIrC that's part of the manufacturing process.
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