> On Apr 8, 2016, at 3:11 PM, Tom Gardner <t.gard...@computer.org> wrote:
>
> Sorry, to a EE they are all epoxies, but:
>
> "BINDER: A polymer such as polyester-polyurethane used to bind magnetic
> particles together and adhere them to the base film in the manufacturing of
> magnetic media."
> http://www.fujifilmusa.com/shared/bin/Magnetic_Media_Terminology.pdf
>
> "Polyester polyurethane is the workhorse of polyurethane films. It offers
> excellent strength and long-term stability"
> http://www.apiusa.com/polyesterpolyure.html
>
> I think properly cured all binders used are pretty stable.
That may be, but if so, there are some big name vendors who do not know
"properly".
paul
