Unfortunately no two companies use the same terms for the same item, when it comes to any recycling commodity. Some companies use low grade, mid, and high and a few specific categories. (This is the norm in dedicated escrap/ewaste)
Others use low and high only and dozens of specific classing. This is more common in large recycling facilities.
Then again you have companies like board sort that have dozens of classes, AND catch-all low, mid, and High (telco)
And to further confuse the process small and medium recyclers will use a blanket escrap category using metal classes (1, 2, 3, 4/breakage) But small local companies usually use electrical scrap and electrical breakage and nothing further if they buy it at all.
Your best resource process isn’t so much a book or guide of category pictures as much as finding in the forum threads where individual boards go, and then looking up variations of those boards.
A quick example. We know the vast majority of router motherboards are classed as peripheral. So a quick Bing or Google image search for “router motherboard” will give you all sorts of examples. The learning point is not which are peripheral but which have enough of this or that to jump out of that class.
With computer motherboards the vast majority are large or small socket. The former including laptop, most AIOs, and the majority of smaller socketed 486 era and earlier boards. The latter including most mid-late 90s thin clients with soldered CPUs. Then you can look up, say, unique motherboard. Or something. You’ll find things like late era Be box boards, and some Via based SFF, peripheral classed motherboards. Or find a next cube board which scoots into telco. Commercial printer boards from xerox, brother, Fuji, etc will make small or large socket class where most printer controller boards go as peripheral.
If you look at the picture in the gallery, and yours is strikingly similar, you’ve got your class. If your motherboard is shaped like a pine tree, you should post a picture to get it classed. And for all our enjoyment in seeing tree shaped motherboards. Etc
And if you have a large brown board with edge to edge ICs; good chance it’s better than low grade.
:)
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