Phase change materials that change at room temperature would certainly be the holy grail of packaging materials. Not sure of the cost though. I used a paraffin based PCMs in an electronics sensor several years ago. The thermal energy from the electronics was absorbed by the wax as it melted, keeping the electronics cool. Afterwards it would revert to it's solid state, ready for the next turn on.
That Phase22 product looks interesting because it's reusable and disposible which means we might be able to find a bio testing company that throws them out.
Here's another one...
http://www.saftpak.com/catalog/CatalogPages12-13.pdf
I'll try to get some samples for testing.
Edit...It looks like the Saf-T-Paks are $6-$7 a piece.
EricG.NH
