Bob Loesch is quite right about the Perflex.  The M.P. Möller Company
used some very early Perflex in their pipe organs.  The earliest
material is still going strong.  Within a year or two the composition
was changed and that stuff is what did the real damage.

My mentor, Richard S. Villemin, never trusted Perflex.  He bought
a "packet" of the stuff and left it on the shelf to see what would
happen.  The layers "melted" into a useless blob of material.  However,
the earliest formulation of the material was placed into an organ by
Möller in 1970 and is still going strong.  By the late 1970s, the junk
was lucky to last five years.

My understanding is that Perflex was developed for military use,
specifically for water bags that could be dropped without breaking
to the troops in the jungles of Southeast Asia.

Tom DeLay
Salinas, Calif.