Thursday, Apr 26, 2012 at 10:02
Yes indeed and exactly right, before the advent of cheap and universally accessable refrigeration lots of things where shipped in dry ice.
And yes icecream particularly, used to be regularly shipped to regional towns by normal rail and road freight packed in dry ice.
even today, if you have been to a school fete, the icecreams served from the company provided icecream van would have been shipped, stored in and served out of dry ice........
back in the days before just about everybody could afford a portable fridge, if you wanted to go camping or traveling for more than a day or two dry ice was a necessity.
How long it lasts
well that is dependent on how
well the package is insulated, the ambient temperature, and how much dry ice is packed compared to the material being stored and how
well it is managed.
I have personally seen dry ice still remaining after 5 days.
If you realy want long times out of dry ice you need to be talking block, because it is so much more dense than pellets.
The icecream shippers generally used are not fabulously insulated ( its just not cost effective) yet they can still get 2 or 3 days out of it.
As I say those medical shippers are worth a look, if you can lay hands on any, some of them the walls are 2 or 3 inches thick high density styro.
If you get everything right, 5 days is certainly not out of the question.
cheers
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