Actually quite a few Caps are worth pulling and saving or refining for PM's:
1) Ceramic Disc Caps each have a silver disc on each side that the leads connect too. Some of them also have Titanium Dioxide
2) As noted earlier, MLCC's can contain have palladium, silver, iridium and even gold
3) Wet & Dry Aluminum Electrolytic Caps can be saved and sold for aluminum breakage. Some Wet & Dry Aluminum caps have silver leads. if your the enterprising type you can build a cheap home foundry for under $30.00 and melt them down to eliminate the contaminates and, if done correctly, come up with some almost pure aluminum bricks
4) Wet Tantalum Electrolytic Caps contain tantalum and are housed in a silver or silver plated container
5) Dry tantalum electrolytic caps contain tantalum and silver. they may also contain iridium and/or niobium
6) Tantalum Foil caps contain tantalum
7) Niobium electrolytic capacitors contain niobium
8) Silver Mica Caps have silver and certain ones are sought after as collectibles
9) Glass Caps are very expensive and have value as used parts resale and are sought after as collectibles
10) Supercapacitors can contain tantalum, ruthenium and iridium
11) Polystyrene film capacitors have value as used parts resale and are also sought after as collectibles
12) Polypropylene have value as used parts resale
These are just a few of the caps that are worth scrapping, saving and either selling as used parts or to a refiner.
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