Name: Susan R.
Date: October 2002
I want to use old Polystyrene foam in molds for art pieces.
I understand from your archives how Polystyrene foam is melted down. How is
Historically, chloro-fluoro hydrocarbons were used to make styrene foams.
These were being phased out in the 1980's and 1990's and pretty much banned
by the EPA circa. 1996. Some dry but informative details you can find on the
When it was clear that CFC's were going to be phased out, (and become much
more expensive), the Polystyrene foam industry put on their thinking caps and now
there are a number of processes using steam, carbon dioxide, and no doubt
other technologies. For the most part the transition has been transparent to
consumers. Search www.google.com for "blowing polystyrene" and you can find
dozens of "hits" that describe various processes in detail.
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Update: June 2012