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Irreversible temperature sensitive labels

Discussion in 'Electronic Repair' started by N Cook, Jun 18, 2007.

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  1. N Cook

    N Cook Guest

    For long term indication of in-service maximum temperatures
    Anyone know of (UK preferably ) supplier of labels with more range and less
    precision than the likes of the usual 5 temperatures in small ranges like,
    116-138 degC
    171-193 degC
    204-260 degC
    say 5 temperature range of 70,100,130,160,200 on single labels
  2. N Cook

    N Cook Guest

    I may make my own rough indicators. So a few common tested materials

    Photocopier toner wiped onto paper label starts fusing about 90 degrees C
    White soap rubbed onto paper label turns brown at about 160 degrees.
    From a selection of those small circular sticky backed paper circles of
    different colours, the blue one changed most to very dark blue at about 200
    deg C and flourescent green one became ordinary green.
    Mylar plastic sheet starts crinkling up at 120 deg C , totally melting by
    180 deg. Any other ideas ?
  3. Smitty Two

    Smitty Two Guest

    Don't remember anything about range and precision, but Burt Rutan drew
    closely spaced parallel lines in various spots on the leading edges of
    SpaceShipOne to test heat levels. He used special wax crayons of
    different colors that melt at different temperatures. I thought it was a
    damn cheap and damn clever method of doing some sophisticated
    temperature monitoring.
  4. A simple Google search for crayon temperature uk found this site. There
    were others.

  5. N Cook

    N Cook Guest

    One other material I'd overlooked is thermal paper for fax or till roll
  6. N Cook

    N Cook Guest

    The till roll paper I tried started to go blue at 75 deg C , so an assorment
    of punched out paper dots with appropriate coatings/impregnations and high
    temp glue should give a reasonable idea of max temps
  7. Ron(UK)

    Ron(UK) Guest

    You can buy ready made temp sensitive labels you know.

  8. Ian Jackson

    Ian Jackson Guest

  9. N Cook

    N Cook Guest

  10. Ian Jackson

    Ian Jackson Guest

    Have you clicked on 'Catalog'?
    Whal seem to have a fair selection of ranges.

  11. <>

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
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