Hello Sandy,
Just an addition, polyester is a family of polymers, Mylar is a member of this family: polyethylene terephthalate (PET), with an special mechanical extrusion treatment.
Mylar, Melinex, and Hostaphan are different brands for the same polymer of Biaxially-oriented polyethylene terephthalate , called BoPET .
PET is Biaxially-oriented to be BoPET by mechanical a extrusion process from the raw PET material.
https://en.wikipedia.org/wiki/BoPET
Plastic botles for soft drinks are also commonly made of PET.
PET repels water, for wettability characteristics (like Grafix ) of PET a surface treatment may be applied, like plasma or UV excimer light:
http://www.nature.com/pj/journal/v43...pj201120a.html
PET wettability is also critical for emulsion coating, for DIY film, Denise explains it in TLF, were I learned that.
I guess that for scanning wettable PET is undesired, as mounting fluid is (non polar) oil.
Regards
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