A phase change material at 71 F (which is what these are) is nearly perfect for PDF shipping. As long as you start out the package on the right side of the phase change (over 71F in winter, under in the summer), this ought to add significant temperature stability to the packaging. I had been wondering for a while if there was a phase change material in the 60s to mid 70s range. Now, where do you buy these?
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