How about Copper metal powder?

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  Copper metal powder is finely granulated copper that has many metallurgic functions. The powder is cheaper than regular cast copper, so engineers can save money on supplies, and it often helps conserve materials because less copper will be needed.
  Copper powder also can be made to have different densities if handled by a powder metallurgist, meaning the copper can be porous and impregnated with oils or other metals, or it can be non-porous like cast copper.