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silicone adhesive as electrical insulation?

Discussion in 'Electronic Repair' started by [email protected], Oct 10, 2006.

  1. Guest

    sci.electronics.repair, rec.bicycles.tech

    Leads from the cateye enduro's cyclocomputer body snapped off during
    an accident.

    I tried soldering the new length of magnet pickup wires following the
    epoxy? block covering the pickup's connection pins molded into the
    computer's bar mount AND then Gooping the wire's solder connections
    to the bar mount at the epoxy block

    Goop is silicone adhesive -

    Question is does the goop silicone provide electrical insulation at
    this low voltage flow?

    The computer stopped recording data after 3-4 miles.

    If the Goop is a no go what adhesive is durable and adequate
    insulation? What are cateye bodies made of and what adhesive works best
    there?
     
  2. Paul

    Paul Guest

    Any silicone (RTV) that I've worked with is a good insulator when fully
    cured.
    I wouldn't be surprised if it is somewhat conductive before it is
    cured, but I never checked.
    I never apply voltage until it is fully cured.

    Paul
     
  3. Paul

    Paul Guest

    Any silicone (RTV) that I've worked with is a good insulator when fully
    cured.
    I wouldn't be surprised if it is somewhat conductive before it is
    cured, but I never checked.
    I never apply voltage until it is fully cured.

    Paul
     
  4. GregS

    GregS Guest

    Rtv need not be capitalized. Goop is not silicone to me. Its more like a plastic.
    I use the different Goops, including Shoe Goo, and I am not going to claim it
    has no reaction to conections, but I don't think I have seen problems. If Goop is used in the sun,
    it should contain UV inhibitors like Marine Goop has. Goop is one of the strongest
    glues, but retains some flex. It takes several days for full cure. Silicone shuld have
    no conductivity, allthough it is not a vapor block, where Goop may have a good
    vapor lock. Electrical connections should be painted with enamel before
    applying silicone.

    greg
     
  5. GregS

    GregS Guest

    By the way, I have applied HV before curing. it does well, but its
    probably better when fully curred.Thats the Type I silicone.

    greg
     
  6. Guest

    Standard GE RTV silicone contains acetic acid which can cause
    corrosion. They do make an electronic grade that is safe to use.

    I once used standard RTV to cover the line voltage terminals on a power
    transformer. I plugged it in before it was fully cured. This caused a
    small explosion.which was more exciting than it was dangerous.
     
  7. Meat Plow

    Meat Plow Guest

    100% Silicon rubber adhesive will work great. I've used it many times
    where it came in contact with low and high voltages.
     
  8. Werehatrack

    Werehatrack Guest

    Wrong. Goop is a polypropylene/solvent adhesive.
    Yes, nicely.
    Look for solder joint failure or a subsequent wire failure elsewhere.
    There is a brush-on electrical insulation coating available for this
    exact purpose. I've obtained it at Home Depot and Ace Hardware.
    I don't know; you would have to ask them. I'd expect it to be a
    filled resin of some sort, but there are many candidates with varying
    charcteristics.
    That will be entirely dependent upon the resin involved.
     
  9. Did you try Liquid Solder?
     
  10. Guest

    wellll, i guess i'll do it over!
    "Wrong. Goop is a polypropylene/solvent adhesive. "
    does not goop write of goop as a silicone adhesive?
    long underwear from duofold is polypropylene, and excellent.
    thanks
     
  11. Guest

    [snip]

    Dear Gloucester,

    If we're talking about the stuff inside that keeps the body of a
    cateye nice and round, it's known as the vitreous humor:

    http://en.wikipedia.org/wiki/Vitreous_humor

    Eye surgeons fear the escape of this vile jelly when removing a cloudy
    lens in a cat(aract) operation or any other surgery. "Losing vitreous"
    is worse than seeing an inflated tire start to creep off the rim at
    120 psi--tubes, after all, can be replaced. So eye cutters try to keep
    the stuff pushed inside, where it belongs:

    "Cataract surgery was once a much more invasive and hazardous
    procedure than it is today. Large incisions and intracapsular lens
    extractions were not uncommonly associated with significant vitreous
    bulging and even vitreous loss. The situation is well described in
    the words of Dr. Paul Honan (1), whose account of the development of
    the Honan balloon can be found elsewhere in this issue of OASIS.
    Suffice it to say that ocular compression was born of the fear of
    losing vitreous during cataract surgery with its attendant
    complications resulting in visual compromise or loss. That fear
    exists to this day, especially when large incisions are required, as
    in corneal transplant surgery and during the occasional ECCE."

    http://www.eyeanesthesia.org/newsletter4.html

    As for repairing an ordinary cyclocomputer, the easiest solution is to
    stop by WalMart and get a new red $10 Schwinn cyclocomputer with a
    fresh battery and a trip meter that reads in increments of 0.001
    miles.

    See you around,

    Duke of Cornwall
     
  12. Werehatrack

    Werehatrack Guest

    My dear Duke:

    Perhaps you may have mistaken the less useful orb (once removed from
    its rightful place) for the more enjoyable one:

    http://www.tias.com/cgi-bin/google.fcgi/itemKey=1922956560

    Alas, once fractured, it is dashed difficult to heal with certainty
    through the employment of any glue made by mortal man, though the
    glass-blower's art might remold it somehow.
    I am aghast! The mere concept of endorsing the use of a Red computer
    is anathema to any left-thinking cyclist, and there is no other kind
    with which it is permissible for those of good conscience to
    associate.

    And as has long been the case, the true gentleman will search long and
    hard to locate a computer whose figures are presented in the more
    seemly furlongs, a far more appropriate distance to use in judjing
    progress aboard something that is ridden astride a saddle, would you
    not agree? (Sadly, such devices seem in short supply, so a conversion
    table is often needed in order to make sense of the mundane
    indications available.)

    Yours,

    Gloucester
     
  13. Guest

    I thought Goop was waterless hand cleaner:

    www.goophandcleaner.com/images/12cutout_200w.jpg

    Have you considered epoxy?

    Silicone rubber (RTV) is a good electrical insulator, as demonstrated
    by the use of silicone rubber sheets as electrical insulators for power
    transistors. But silicone RTV that smells like vinegar before it
    cures can corrode metals, and if that's a concern, go to an auto parts
    store and get some RTV labelled as being safe for use with oxygen
    sensors.
     
  14. Guest

    I don't know, but one thing's for sure; you sound a lot more coherent
    than before the accident! Funny, usually it's the other way around.
    Glad to hear you are okay.

    Doug
     
  15. Leo Lichtman

    Leo Lichtman Guest

    keeps the body of a cateye nice and round, it's known as the vitreous humor:
    (clip)
    ^^^^^^^^^^^^^^^^
    Dear Carl,
    Your remark is vitreous humor humor.
    Jokes about glazed ceramics would be vitreous humor.
    Jokes about my first comment would be vitreous humor humor humor.
     
  16. James Sweet

    James Sweet Guest


    I use clear silicone caulk as insulation on high voltage wiring, I've
    tried it up to 30KV and it works great. Not sure about Goop but for low
    voltage virtually anything will work.
     
  17. Guest

    stupid question # 428

    if silicones insulate electrical wires then what are silicone spark
    plugs leads (wires)?
     
  18. James Sweet

    James Sweet Guest


    They're exactly what the name implies, spark plug leads with silicone
    insulation.
     
  19. spake thus:
    The silicone is the insulator in them; the conductor is, usually,
    carbon-impregnated fiber of some kind (basically a big long resistor).
     
  20. Guest

    pow pow pow pow
     
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