That makes me think about something like this:
ScrapMark1 or Common scrap (Industrial scrap?) could be scrap made from things like gears/ wires etc... basically anything produced from plates or for the creation of intermediate products. Can have 50 to 100 in stack size
ScrapMk2 or Advanced scrap could be made from anything needing intermediate products in the recipe or for the creation of high-end intermediate products ( 5 to 20 stacks)
Information glitches or corrupted information (ScrapMk3) could be scrap made from science recipes. Maybe some other way of dealing with this type of scrap (maybe a modified lab that consumes them, destroying them and creating pollution. Needs power or consumes batteries / circuits. This type of Scrap would not stack.
Maybe some form of toxic ooze or sludge that needs to be piped out from oil based recipes