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Pure copper wire

Discussion in 'Electronic Design' started by Ken Smith, May 3, 2004.

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  1. Ken Smith

    Ken Smith Guest

    Does anyone know where I can find some 99.9999% pure copper wire?

    I need some pure #22 gauge wire to wind some very non-magnetic coils for
    some experiments.
  2. Ian Stirling

    Ian Stirling Guest

    Why do you think you need better than 99.95% or so (common electrical
    wire purity).
    Not saying you don't, just wondering.
  3. Ken Smith

    Ken Smith Guest

    fair question:

    99.95% wire is even getting hard to get these days. I we need a
    conductive material with a mu very close to thatof free space. These
    coils are part of a highish performance magnetometer. If it wasn't for
    the impurities, this magnetometer would have an absolute accuracy limited
    only by the accuracy of the frequency reference.
  4. Ken Smith

    Ken Smith Guest

    I didn't think Alpha Wire did its own copper. I'll check it out.
  5. Ken Smith

    Ken Smith Guest

    I doubt it; They've mostly got ordinary copper wire in a fancy jacket that
    works like a lens to make the copper look better. Besides I need #22 they
    all use 14 or heavier.
  6. Ken Smith

    Ken Smith Guest

    Yes, if you can find copper that is clean enough. All of the copper I've
    found has a paramagnetic property.
    Yes and there is no mysterious coating that lowers mu hence the need to
    find some clean wire.
    How about: not "they mostly" but rather "every doggone one of them"

    They stop returning phone calls as soon as the fact that we need #22 that
    is clean and can tell if it isn't comes up.
  7. I'd suggest you need to talk to one of the specialist material companies. In
    the UK, I needed some high purity coper wire as part of an instrument, and
    Rautomead International were able to help. Basically they produced a super
    quality thick wire 'rod', that was then made into wire by a subcontractor.
    The company who supplied the equipment they used, was NGO Han in Vietnam.

    Best Wishes
  8. On Tue, 4 May 2004 14:58:06 +0000 (UTC), the renowned
    That's Alfa Aesar, a lab supply outfit, not Alpha Wire. If they have
    the wire, it will be VERY expensive.

    Best regards,
    Spehro Pefhany
  9. Ben Bradley

    Ben Bradley Guest

    Promptness... I'm visualizing a musical with dancing electrons
    singing "Get me to the Audiophile's ears on time." I'll name it "My
    Fair Stereo."
  10. Tim Wescott

    Tim Wescott Guest

    Jenlabs advertises high-purity wire. I don't know if they'll sell it to
    you without dipping it in liquid nitrogen first (their web site is a
    scream if you're technical and not an audio freak).

    As mentioned by other posters you may end up drawing your own wire, or
    having it drawn for you.
  11. Tim Wescott

    Tim Wescott Guest

    If _your_ customer base believed that dipping a piece of wire in liquid
    nitrogen would make your sterio sound better would _you_ bother with
    actually delivering the goods? I mean, they say "if you're gullable,
    buy from us", then the sell.
  12. Tim Wescott

    Tim Wescott Guest

    And make sure that the subcontractor maintains the purity. You may have
    to choose your contaminant -- if it's drawn through dies it'll pick
    stuff up no matter what.
  13. _Very_ true.
    It was harder to find somebody who could reduce the wire to the required
    diameter, while meeting the purity requirements, than finding the pure
    'feedstock' in the first place...

    Best Wishes
  14. Ian Stirling

    Ian Stirling Guest

    Might foil do?
    Might be easier to make it pure than wire, as you arn't trying to
    pull it through a die.

    Is this for a proton precession magnetometer?

    Why can't you calibrate the error out, or are you trying to measure
    the properties of the coil, not the external field?
  15. John Larkin

    John Larkin Guest

    These people may have something...

  16. Ken Smith

    Ken Smith Guest

    We have used an acid bath to remove a little of the diameter and thus the
    debris in the past. We may have to do that this time.
  17. Absolutely! Nothing really brings out the hidden detail in grunge,
    garage-rock, and lo-fi like superpure speaker wire. And the realism I get
    when listening to sampled, synthesized, heavily-processed electronica...
    well, it's just like being there. Wherever "there" was, I mean.

    But for me, the thing that made all the difference was when I added the
    special power conditioner. It looks just like a heat pump - you know,
    cylinder a couple of feet tall and wide, fins on the side, hoses - but it
    actually takes each individual electron, laser-sorts it, cryogenically
    aligns its spin and corrects quantum deviations, and then sends it directly
    to a dedicated outlet for the hifi. I never realized before that how much
    of what I was hearing was just resonances from other stereos in the

    Now if I could just get the carpet-cleaning truck in my neighbor's driveway
    to turn off, I'd really have a pleasant listening experience.
  18. Well he did say 99.9999% copper.
  19. Ken Smith

    Ken Smith Guest

    Hummmm..... No. There would be too much eddy current in the foil. In
    larger coils we do as suggested in Mr. Berry's patent and use wire rope to
    wind the coil.

    Since the copper is not evenly distributed, the effect varies with angle.
    Since we don't know the angle, we can't compensate perfectly for the
    varying effect.
  20. On Tue, 04 May 2004 22:43:23 GMT, the renowned "Martin Riddle"

    (>> the wire, it will be VERY expensive.)
    Yeah, but even so.. their US/Canadian web site is down, but on their
    Euro site:

    Uninsulated 1.0mm (0.04") Puratronic 99.9999% wire is GBP246.80 =
    US$440 for one 5m (<15') length. That's going to be one expensive coil
    if there's any amount of wire in it, assuming the insulation issue can
    be solved.

    On mundane chemicals you can often get a MT of industrial grade
    material for what they want for 250gm.

    Best regards,
    Spehro Pefhany
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