I don't know if this has ever been posted here, if it has, sorry for the double post.
Check out this website. Look up at the top right hand side. Click the link to the "scrap Specfications" and download the great PDF on different types of scrap and how to grade them.
I think it has been posted before, but from a different website. I think hobo posted it the first time. Doesn't matter though, because I'm sure there's lots of new members and lurkers who haven't seen it yet.
Did you find anything else of interest on the Globus website?