If the packaging has no listing information, check that Manufacturer's website.
It might take some time, but you should be able to find listings on their site - in either HTML text right on the page, or from a downloaded spec/cut sheet (normally an Adobe Acrobat file or .PDF).
If they do not have any listings anywhere, do not use that Company's stuff ever again!!!
Also fill their mailbox with "Nasty Grams" (e-mail and snail mail).