Polyduranium was a very rare material.

In 2153, polyduranium was encountered by Enterprise in the doors of the Delphic Expanse sphere and the Osaarian merchant ship's hull. (ENT: "Anomaly")

Polyduranium was used in a bulkhead on the bridge of the USS Defiant. In 2371, Ornithar expressed an interest in it but he believed it had no real value. (DS9: "The Search, Part I")

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