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If you have a level 4 R&D platform and are asking how you get "some kind of metal" then I must be misunderstanding something about what you're saying. Since I already have them all researched I can't tell you what you need to unlock them, that information disappears. You may need to extract a person with a certain skill. It literally says right on the item what you need, though, so just look.
You can not see these upgrades until you get the certificate, so that is why you may be confused.