It's not a direct method but, if you look for suitable media on the high street - say Epson Premium Glossy Photo Paper which is 255g/m2 - then check against the media on the manufacturer's website - e.g. click here - that should give you the sort of detail required. HTH.
BTW, we use Jessops's economical 260gsm ink jet photo paper (very glossy) on our Epson Stylus Photo R220s and the results are splendid. It says Instant Dry and Smudge Resistant on the box and for us, 'it does just what it says on the box'.
The same paper also goes through our HP LaserJet 10xx printers (as single sheets) again without difficulty and gives very classy results on the glossy medium. They come out very hot and curly but, if laid on a flat surface for 20 secs or so, they're perfect.
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