Lithium hydride is a chemical sample found in Cambridge Polymer Labs, initially found as unidentified sample 3111. Once the sample has been loaded into one of the polymer coating applicator's sample to holder, the option 'scan loaded reagents' needs to be selected from its terminal in order to identify the sample by its chemical name. It is one of the two key samples required to produce piezonucleic power armor along with gold.
Other than being placed in the polymer coating applicator, lithium hydride cannot be removed from the player character's inventory.
Lithium hydride can only be found in Cambridge Polymer Labs. It is locked in the ground floor room opposite the clean room and furthest from the stairs.
pc The item may appear as an empty container, simply named "NONE" in the inventory. When dropped the item simply floats in the air. [verified]