Phobium

Phobium is a grade 3 premium scavenged metal crafting material.

Source
Phobium can be gathered from a Phobium Barrel node, which requires 160 skill in scavenging. It is most commonly found on Alderaan and Tatooine.

The following materials can also be found in Phobium Barrel nodes:

They can also be obtained from grade 3 scavenging missions. Additionally, there is a chance to obtain Phobium from reverse engineering the appropriate level and type of gear.

Uses
Phobium is used in several crafting schematics: