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Q on rating in volts per mil

Discussion in 'Electronic Design' started by [email protected], Sep 6, 2012.

  1. Guest

    The datasheet "spec" for a conformal coating is Dielectric Breakdown
    Voltage, volts per ASTM, Meth. D149 = 6300V.
    What the #$*&#(#$! is the actual rating in meaningful terms, volts
    per mil?
     
  2. legg

    legg Guest

    Type of conformal coating amd mfr?

    RL
     
  3. Martin Brown

    Martin Brown Guest

    Of course it is unless you prefer kV/inch.

    See http://www.allaboutcircuits.com/vol_1/chpt_12/8.html
     
  4. Jamie

    Jamie Guest

    Yes.


    Jamie
     
  5. Guest

    At least the "specification" of Dielectric Withstand Voltage, volts
    per MIL-I-46058C >1,500 is semi-access able in that the MIL spec
    appears to specify 2mil coating (not eXplicitly clear,tho).
     
  6. Guest

    HumiSeal 1B73™ Aerosol Conformal Coating
     
  7. Guest

    Wow! The rating is "Yes." volts per mil. Thanks.
     
  8. I think D149 is done with a 0.100" gap.

    <http://file.yizimg.com/305304/2012060809264490.pdf>

    Cheers
     
  9. josephkk

    josephkk Guest

    What part of that is a standard test unit for the past 40 years or more
    don't you understand?

    ?-)
     
  10. Some data sheet specify what thickness/distance was used in the D149
    test.
    I looks like common gaps are 0.010", and 0.050" . There is a difference
    in results depending upon what gap is used.
    It's not like D877 (for liquid dielectrics) which specifies a 0.100"
    gap.

    Cheers
     
  11. Guest

    Thank you very much for the copy.
    Seems I was correct in saying the method would not be clearly
    described and certainly not worth about $50.00 .
    It is not clear what gap to use; the table of some tests that
    included teflon at the top was nice !!VOLTS PER MIL!! but was incomplete
    in that the D149 rating was sorely lacking (as points of reference).
    What WAS clear is the "nagging" that the test specimen be dunked in
    (transformer?) oil - and thus the test may become moot and/or yield
    exaggerated results.
    And, naturally, there was umpteen references to other "standards"
    perhaps a hint to feed their infinite greed.
     
  12. Guest

    ...and of course, the gap used is studiously NOT mentioned!
     
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