From Starbounder - Starbound Wiki
Removed: No Longer Available
Impervium Bar was removed from the game files, and is no longer obtainable.
Impervium Bar is an old crafting material refined from Rubium Bar and Coal. It was removed from the game in update Rampaging Koala and replaced with Impervium Compound.
- Perturbed Koala: Added
- Rampaging Koala: Removed, replaced with Impervium Compound