On Dec 10, 5:25*pm, "anorton"
wrote:
"Richard J Kinch" wrote in . 97.131...

What is this stuff? *I've found exactly one secret knot that won't pull
apart for tying ends together. *Try it.

It is expanded PTFE just like the material they make their gaskets from. *I
have always been amazed at W.L. Gore; this company has built a whole range
of businesses around creative uses of basically the same stuff:http://www..gore.com/en_xx/products/index.html

I think that there is a better reference in US patent 5518012. See
the Background section:
http://www.google.com/patents/about?...dq=glide+floss