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Dust-Off vs freeze spray

Discussion in 'Electronic Design' started by Oppie, Nov 15, 2011.

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  1. Oppie

    Oppie Guest

    Not quite 'Hints from Heloise' but someone in the lab had run out of
    Dust-Off (canned air). I offered my can of freeze spray and told him to just
    hold it upside down, give a quick spray to clear out the liquid from the
    pickup tube, and then it would just be gas.
    AFIK, it's the same HC134 fill used in both products. Only difference is
    that freeze spray has an internal pickup tube that dispenses liquid from the
    bottom of the can while Dust Off takes gas from the top of the can.
    Conversely, if you need circuit chiller and have only dust off, turn the can
    upside down...

    Oppie
     
  2. tm

    tm Guest

    yeh it is r134a, same as in your fridge or aircon, but for some reason
    there it has
    all kinds of regulations

    considering is has global warming potential of 1300 it is strange that
    you can
    still get it for applications where it is just let out in the
    atmosphere

    -Lasse

    _________________

    You mean that if I buy a bunch of it and spray it all around, it will be a
    warmer winter?

    Cool!
     
  3. Oppie

    Oppie Guest

    R12 was far worse in terms of ozone damaging. R22 was not as bad and was
    still used long after R12 was banned.
    I can get HC134A tor my car A/C from the auto parts store no problem. Go to
    a refrigeration supply store and they can't sell it to you unless you
    produce an EPA license to handle refrigerants.

    Be that as it may, freeze spray for circuit testing beats using butane or
    propane liquids.
     
  4. ehsjr

    ehsjr Guest

    Good one! Do we have to call you Heloise from now on? :)

    Ed
     
  5. Oppie

    Oppie Guest

    How Sublime <pun intended>

    Gee, my school had only the pressurized water extinguishers that you had to
    turn upside down and shake. I believe that there was baking soda (or another
    alkali) dissolved in the water and a cup of acid below the top that would
    mix and create the pressurizing CO2 when upended.
    http://en.wikipedia.org/wiki/File:Childs_soda-acid.JPG

    from http://en.wikipedia.org/wiki/Fire_extinguisher

    Speaking of CO2, went by Whole Foods in White Plains, NY the other day and
    saw a tank truck unloading liquid CO2 to a pipe connection by the street.
    Wonder what they use it for?
     
  6. Oppie

    Oppie Guest

    ...Conversely, if you need circuit chiller and have only dust off,
    How about "Oddities from Oppie"? Has a ring to it, would you say.
     
  7. Oppie

    Oppie Guest

  8. Guest

  9. Oppie

    Oppie Guest

    Then there was that day of boredom when I was using one of those propane
    weed burners that runs from a 20lb barbecue tank. After taking care of the
    weeds coming through my gravel driveway, I had the dumb idea to leave the
    burner on low pilot and INVERT the tank... Hit the lever and shot a flame
    of liquid propane 20 feet. Did it just once for effect. It scared the crap
    out of me!
     
  10. Guest

    It is extremely stupid that they will sell 134a to vent to the atmosphere, but put restrictions on it to charge your air conditioner. I heard that California may put restrictions on R134A sales at auto parts stores, yet you can still buy a can of freeze spray. It's OK to blast it out in the atmosphere, but it's NOT OK to put it into a sealed system where it MIGHT leak out, or if you do it right it can be recovered and recycled?

    GM is actually testing out a new refrigerant, HFO-1,2,3,4-YF, and put it inmost 2013 Chevy's. However, they are still ironing things out because they did a test where a fireball shot out during an accident test! (probably the oil aspirated that caused this).

    For a while they made this stuff called HC-12a, which is isobutane, butane,propane, etc. Great stuff, colder than R12, can be put in R12 systems w/oany retrofitting, more energy efficient, very "green" and a great refrigerant. However it was banned for use in refrigeration for obvious reasons (put it in your car, you get in an accident where the evaporator cracks and it burns your face off for instance).

    Dust off is actually difluoroethane, (R152A), and R134a is 1,1,1,2 tetrafluoroethane. I heard of someone charging their car w dust-off, and it workedgreat, however I am a little worried about putting it in my car as it has this bitterant in it, to keep kids from huffing it.

    I live in Washington, and I have to say global warming has made the weatherparadise here in the summer (great summer, 72 degrees average temp in Seattle, sunny). Was always rainy and cloudy growing up. Destroying the rest of the world, but great weather here. No wonder they're building so many apartments, condos, and town houses as everyone want's to live here now :)
     
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