The Quantum Tube Fab manufactures Quantum Tubes from Energy Cells, Ore and Food.
NPC stations will buy Crystals as a secondary resource.
Tube fabs manufacture quantum or so-called Planck tubes, a quantum level counterpart of the valve created from silicon that is used inside the engines and controls of many of the larger transporter ships and destroyers.
Some Planck Tubes are also used in the manufacture of Particle Accelerator Cannons. The manufacture of Plank Tubes is both costly and complex.