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There are several other manufacturers of drafting film, such as Grafix, Azon, or Alvin. They're all pretty much identical. 3 mil thickness is common, up to 5 mil I think, but once mounted it doesn't much matter. I've used an acrylic gel as an adhsive and it works fine. The single sided matte is slightly cheaper than double sided. There's another film type made of polypropylene (Borden & Riley's Denril brand) that is almost identical. Also, drafting "vellum" is made of cotton fiber rather than synthetic. Canson makes a Opalux brand of this, and there are others. It's not as tear resistant as Mylar, but otherwise about the same.
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