Double sided mounts

I am about to embark on a large project of remounting works in
double sided mounts.  The new mounts will again be double sided
however I need to find a good "glazing" solution for the verso of
the mounts.  I have already been sent samples of 1mm Perspex and
175micron Melanex, neither of which is totally suitable.  Does
anyone know of even thinner Perspex (Plexiglas) or thicker Melanex
(Mylar)?  Or perhaps you use something else altogether in which case
please send details.  Details and supplier information would be very
useful.

Alexandra Greathead
Paper Conservator
Ashmolean Museum
Oxford
England


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                  Conservation DistList Instance 22:8
                  Distributed: Sunday, August 3, 2008
                        Message Id: cdl-22-8-019
                                  ***