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Sourcing Dry Ice

Discussion in 'Science' started by Smortime, Sep 7, 2015.

  1. Hi all,

    Where do you get your dry ice from? I've heard of people getting it free, from hospitals I think?

    Any suggestions?



    Thanks,

    Sam
     
  2. blazer

    blazer Star commenter

    It is very difficult stuff to get these days, I have tried. Plus with all the H&S those that do still use it are reticent about giving it out as they may become liable if the person using it has an accident with it.

    Do you need big lumps? You can blast a CO2 fire extinguisher into a cloth and that will give you some powder.



    Not doing cloud chambers by any chance?
     
  3. Fizzbobble

    Fizzbobble Occasional commenter

    Do NOT do that with a fire extinguisher.

    Dry ice is easy to get and very safe to use, when handled with care. Try the company Chillistick; ten kilos costs about fifty quid, and it'll last quite a while.

    www.chillistick.com/.../dry-ice-pellets-in-pack-sizes.html

    I don't work for them! I'm a physics teacher who has bought from them before.
     
  4. msuxg

    msuxg New commenter

    Universities may give/sell you a small amount.

    The CLEAPSS handbook has some information on how to produce your own using a carbon dioxide cylinder and attachment.
     
  5. Jolly_Roger1

    Jolly_Roger1 Star commenter

    Years ago, we used to have a black, velvety material bag, made for the purpose by Griffin and George, into which we piped carbon dioxide from a cylinder, to make dry ice. it made reasonably-size lumps, as well as a frosting you had to scrape off the inside of the bag. As Fizzbobble said, I think the gas would come out of a fire extinguisher too quickly.
     
  6. Fizzbobble

    Fizzbobble Occasional commenter

    The rate of the gas isn't my major concern! It's a criminal offence to use a fire extinguisher for any purpose other than fighting a fire!
     
  7. blazer

    blazer Star commenter

    What even a decommisioned or spare one? Ask the schoolcaretaker he will have a few stashed away in a cupboard.
     

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