In the latest issue of Pharmaceutical Manufacturing and Packing Sourcer, design engineer Richard Harrop notes that, not so long ago, water was the
filler material of choice for most cooling packs. The initial response to using phase change materials was, well, a bit chilly. They were thought
to be costly and unnecessary. But now, Harrop writes, "the benefits of size, weight and cost saving are apparent. It is becoming clear that the growing
inclusion of PCMs is not just a phase, but rather something that we can be excited to see much more of."
Note: The link below leads Harrop's complete piece. Ignore the "Read full article from PDF" tease at the bottom.