On Sun, 27 Jun 2010 18:41:42 -0400, Dan Bracuk
wrote:

On Sun, 27 Jun 2010 11:16:02 -0700, Geoff
wrote:

:Neoprene, (polychloroprene) is produced from "divinyl acetylene, a
:jelly which firms into an elastic compound similar to rubber when
assed over sulfur dichloride."
:
:Neoprene itself is inert, doesn't oxidize readily and has unique
:elastic properties that make it useful in a wide variety of
:applications.
:
:The problem Judy is experiencing is from decay and separation of the
:Neoprene from the compounding agents used to fabricate the fins.

These fins are made of neoprene?

Most likely. Neoprene dates from the 1930's and is the most widely
used synthetic rubber. Wetsuits and dry suits are made from
nitrogen-foamed neoprene.