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rubbishemail@web.de
science forum beginner
Joined: 08 May 2006
Posts: 7
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 Posted: Mon Jun 12, 2006 4:55 pm Post subject:
dissolve PTFE
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Hello,
is there any way to dissolve PTFE without harming brass?
I need to strip very thin wires with teflon insulation.
Maybe there is some molten salt that can be used?
Many thanks
Daniel |
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rubbishemail@web.de
science forum beginner
Joined: 08 May 2006
Posts: 7
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| Posted: Mon Jun 12, 2006 5:43 pm Post subject:
Re: dissolve PTFE
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the insulation melts in contact with a soldering iron, so maybe it is
not PTFE (FEP?) as written in the datasheet.
> Daniel |
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<HLS@nospam.nix>
science forum addict
Joined: 25 Oct 2005
Posts: 90
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| Posted: Mon Jun 12, 2006 9:18 pm Post subject:
Re: dissolve PTFE
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<rubbishemail@web.de> wrote in message
news:1150134201.683122.168410@i40g2000cwc.googlegroups.com...
| Quote: |
the insulation melts in contact with a soldering iron, so maybe it is
not PTFE (FEP?) as written in the datasheet.
Daniel
|
PTFE will melt, or at least flow. It tolerates high temperatures better
than a lot of things,
but is not immune to heat.
No, there is no common solvent for PTFE: |
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Mark Thorson
science forum Guru Wannabe
Joined: 04 May 2005
Posts: 102
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<lucasea@sbcglobal.net
science forum addict
Joined: 25 Mar 2006
Posts: 94
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| Posted: Tue Jun 13, 2006 2:57 am Post subject:
Re: dissolve PTFE
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<rubbishemail@web.de> wrote in message
news:1150131303.702605.11210@h76g2000cwa.googlegroups.com...
| Quote: | Hello,
is there any way to dissolve PTFE without harming brass?
I need to strip very thin wires with teflon insulation.
Maybe there is some molten salt that can be used?
|
I'm not sure about your case, but a lot of wire insulation is LDPE,
frequently crosslinked. If it is crosslinked, then good luck dissolving it
off. If not crosslinked, LDPE should be soluble in reasonably common
solvents--toluene, xylene or decalin. If it is indeed PTFE or FEP,
fluorinated solvents are your best bet, as another poster pointed out. I'm
not sure you'd need something exotic--I wonder if you might not be able to
get away with hot C6F6, perfluorocyclohexane, or maybe perfluorodecalin, all
of which I believe can be had reasonably inexpensively (sorry, I don't have
my Aldrich catalog in front of me at the moment.)
Any reason you want to dissolve off rather than mechanical stripping? I
often strip delicate wires by very gently using a razor blade to cut the
insulation, followed by pulling it off by hand. Even if you can't dissolve
the insulation off and if your wires are still too delicate for
cut-and-pull, maybe you could cut with a razor blade or knife, swell the
insulation with some solvent to loosen it, then pull it off by hand.
Eric Lucas |
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Repeating Rifle
science forum Guru Wannabe
Joined: 25 Mar 2005
Posts: 205
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| Posted: Tue Jun 13, 2006 3:49 am Post subject:
Re: dissolve PTFE
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On 6/12/06 2:18 PM, in article
XSkjg.44469$4L1.38052@newssvr11.news.prodigy.com, "HLS@nospam.nix"
<HLS@nospam.nix> wrote:
| Quote: |
rubbishemail@web.de> wrote in message
news:1150134201.683122.168410@i40g2000cwc.googlegroups.com...
the insulation melts in contact with a soldering iron, so maybe it is
not PTFE (FEP?) as written in the datasheet.
Daniel
PTFE will melt, or at least flow. It tolerates high temperatures better
than a lot of things,
but is not immune to heat.
No, there is no common solvent for PTFE:
PTFE insulated wire is used a lot. There are thermal wire strippers |
available for that. I never used them myself.
Bill
-- Ferme le Bush |
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Adam S
science forum beginner
Joined: 31 Aug 2005
Posts: 8
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| Posted: Tue Jun 13, 2006 6:14 am Post subject:
Re: dissolve PTFE
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rubbishemail@web.de wrote:
| Quote: | Hello,
is there any way to dissolve PTFE without harming brass?
I need to strip very thin wires with teflon insulation.
Maybe there is some molten salt that can be used?
Many thanks
Daniel
|
I've never seen PTFE insulated brass wires , but you can try molten NaOH.
see.
http://www.dotmar.com.au/products/ptfe/tetron_fep.htm
I sometime use molten NaOH to strip enamel coated magnet winding wire. I
take a strip of copper sheet metal and sit it of over a gas flame. Some
of the copper sheet should stick out away from the flame and inch or so.
The wires to be stripped are first heated in the flame for a few seconds
(not enough to carbonize of coating), then dip in container of dry
powdered NaOH , so a few grains stick to the wire end. I then touch the
wire on the exposed piece of hot copper sheet metal. After a few seconds
the wire heats and the NaOH melts around the wire and completely strips
clean the enable coating. This works great for stripping bundles of fine
cables. Be prepared for falling drops of molten NaOH.
Adam S |
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rubbishemail@web.de
science forum beginner
Joined: 08 May 2006
Posts: 7
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| Posted: Tue Jun 13, 2006 8:21 am Post subject:
Re: dissolve PTFE
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Hello,
| Quote: |
Any reason you want to dissolve off rather than mechanical stripping?
I need to do this with a lot of wires and if one breakes later, I have |
to take the whole setup apart.
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rubbishemail@web.de
science forum beginner
Joined: 08 May 2006
Posts: 7
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| Posted: Tue Jun 13, 2006 8:26 am Post subject:
Re: dissolve PTFE
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| Quote: | I've never seen PTFE insulated brass wires , but you can try molten NaOH.
see.
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this is a special wire with low thermal conductivity used for low
temperature applications
Thanks for the NaOH idea, I`ll try this
Daniel |
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ratman
science forum beginner
Joined: 16 Jun 2006
Posts: 3
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| Posted: Fri Jun 16, 2006 1:55 am Post subject:
Re: dissolve PTFE
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On 12 Jun 2006 09:55:03 -0700, rubbishemail@web.de wrote:
| Quote: | Hello,
is there any way to dissolve PTFE without harming brass?
I need to strip very thin wires with teflon insulation.
Maybe there is some molten salt that can be used?
|
What gauge? I often strip 30 AWG Teflon wire with an ordinary
Sears wire stripper and have no trouble. A thermal stripper might be
better if you are going to strip a lot of wires.
| Quote: |
Many thanks
Daniel |
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