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substitute for methylene chloride as a blowing agent



I'm looking for information about substitutes for methylene chloride as
a blowing agent for foam.  Perhaps CO2.  (NOT trichlorethylene).  I'm
curious of anything is out there on either a research scale or better
yet, commercial scale.  Isn't the blowing agent use of methylene
chloride much more environmentally significant than its use as a cleaner
(either for the mixing chamber or the delivery tip?)  Tnaks.