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Insulating plastic sheet

Discussion in 'Electronic Design' started by Chris Jones, May 17, 2013.

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  1. Chris Jones

    Chris Jones Guest

    Does anyone know where to get that plastic sheet lining that is used
    inside the metal case of electronic fluorescent ballasts to wrap around
    the PCB where they would otherwise not meet the creepage and clearance
    requirements of IEC specs? I think it is also used in some power supplies.

    Ideally I would like to find a type that is already recognised by the
    safety test labs, and that is fire retardent.

  2. Uwe Hercksen

    Uwe Hercksen Guest


    you may look for kapton foils.

  3. Phil Allison

    Phil Allison Guest

    "Chris Jones"

    ** Why not use that reddish or grey coloured vulcanised fibre sheeting that
    you see everywhere ?

    Will not easily puncture or tear like plastics do and is not easily

    Also known a "fishpaper", "leatheroid" or "elephant hide".

    .... Phil
  4. Chris Jones

    Chris Jones Guest

    Thanks. I will consider that stuff. It was also a useful source of
    search terms that turned up these products:


  5. You want paper. Nomex transformer paper. 1500 volts per mil.

    You can get it from one mil thick to over 50 mils.

    As far as plastic goes, even the worst choice likely has the dielectric
    strength to act as an insulator. But there are plenty of polymers which
    are actually used for and sold for this purpose.

    Not just one.
  6. I haven't heard the term Fish paper in a long time.
    Nomex is preferred, even 94V-0. I don’t know if fish paper has a

  7. Greegor

    Greegor Guest

    10"x24" $9.63

    Q: Is this material UL Recognized; if so, what is the file number?
    A: This part is UL listed and the UL file number is E55656.

    Fish Paper Gasketing

    We have no idea where Fish Paper originally got it's unique name. It
    is not because it is used to wrap fish, put possibly because it looks
    like the paper used to wrap fish.

    Intended for electrical applications involving high dielectric
    strength, plus good forming and bending qualities. Applications
    include all types of armature slot insulations, arc shields, coil
    insulations, insulation washers, and formed specialties.

    Size: .010” x25” x40”

    Fish Paper & Aramid Paper Alternative
    Fish paper and aramid paper are not always the best choices for
    electrical insulation. Alternative materials have characteristics that
    can reduce cost and improve design performance. Unlike fish paper,
    which is made of cellulose, and aramid paper, which is made of aramid
    fiber, Formex™ polypropylene electrical insulation is non-hygroscopic
    (moisture absorption <0.06%). This means Formex retains its structural
    integrity and dimensional stability even in the most demanding outdoor
    applications unlike typical insulation paper.

    Formex also has greater dielectric strength than fish paper and aramid
    paper enabling thinner sheets of insulation material to be used in an
    application thereby saving cost and weight.

    Most importantly, Formex, is easily scored and folded into durable
    three-dimensional parts providing the ability to replace molded and
    sheet metal parts such as air-flow baffles, battery covers, and wire
    harness organizers with a lightweight, low-cost, flame-retardant
  8. Phil Allison

    Phil Allison Guest

  9. Phil Allison

    Phil Allison Guest

    "Phil Allison"

    ** This link is real - you FUCKING MORON !!
    ** Proves what ???

    ..... Phil
  10. Nomex was one of the few plastics DuPont would not include in their sales
    brochure folder things. Even the Kapton sales folder came with full sized
    sample sheets.
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