I don't mean photographic film/film base but rather the A4/Letter sheets of transparent film that were used in slide projectors during lectures. For example see this.
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3It depends. There are several variants, depending on printer and cleaning solvent to use. However, http://en.wikipedia.org/wiki/Transparency_(projection) states, A transparency, also known in industrial settings as a "viewfoil" or "foil", is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn. – permeakra Jan 29 '15 at 15:41
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I would have thought polyester was more common as it is for laserjets. – matt_black Jan 29 '15 at 22:38