Whats the best way to preserve dry ice?

Question

im purchasing about 2 pounds of dry ice tomorow and i was wondering how i could keep it from evaporating, so far i have a small cooler and some tin foil, if i wrap the ice with the tin foil should that keep it from evaporating? also if it does which side should be facing in, shiney side or dull side?

Answer 1

You should be careful putting it in a freezer.  Dry ice of course expands a lot when it sublimes, and so putting it into a sealed container will lead to a "dry ice bomb" - the container may eventually burst.

Tin foil doesn't trap heat super well (the air pockets in it do trap heat, but aluminum conducts heat well).  And even if it did, it would not make the dry ice sublime faster - it would keep heat from the warmer outside from getting in.  Thus, you want a very good insulator.  I would recommend bubble wrap or newspaper wads.  Also, do not put water ice in the cooler as well - it will melt and make the dry ice sublime faster.

Answer 2

Keep it in the freezer after putting it in a plastic.Do not put in a foil because it reduces loos of heat an could melt the ice.(that is why it is used for hot food.Agreed but if dry ice sublimes it means it changed from solid to gas,How could ice sublime when it is put in a freezer.(explain