Friday, May 02, 2003 at 01:26
As the guy above said ..........Consider Dry Ice!
Dry Ice is particularly useful for freezing, and keeping things frozen because of its very cold temperature: -78.5°C.
As a general rule, Dry Ice will sublimate at a rate of 2.5 - 4.5 kilos every 24 hours in a typical esky. This sublimation continues from the time of purchase, therefore, pick up Dry Ice as close to the time needed as possible. Bring an ice chest or some other insulated container to hold the Dry Ice and slow the sublimation rate. Dry Ice sublimates faster than regular ice melts but will extend the life of regular ice.
Dry ice gives more than twice the cooling energy per pound of weight and three times the cooling energy per volume than regular water ice
Additionally as it melts it turns directly into carbon dioxide gas rather than a liquid and so there is no messy liquid left over like you would have with normal ice.
Check out the BOC gases for their product 'Snowpack' which allows pellets of CO2 dry ice to be made on the spot
, wherever they are wanted.
I don't know if you can hire them but maybe if you do a lot of tripsit is worth purchasing.
To handle dry ice, you want to be sure to wear heavy gloves, the super-cold surface temperature can easily damage your skin if you touch it directly. For the same reason you never want to taste or swallow dry ice either. Another important concern with dry ice is ventilation. You want to make sure the area is well-ventilated. Carbon dioxide is heavier than air and it can concentrate in low areas or in enclosed spaces (like a car). Normal air is 78% Nitrogen, 21% Oxygen and only 0.035% Carbon Dioxide. If the concentration of carbon dioxide in the air rises above 5%, carbon dioxide can become toxic. Be sure to ventilate any area that contains dry ice.