I have a small cache of the now-discontinued Quickex Quicker Pro mini pumps. They have 105 cm3 stroke volume, and 5 kgf force required for 7 bar pressure. In about 100 strokes, I reach 7 bar on 28mm 700C tires. The reason for these extraordinary specs is that the pump has a multi chamber double action design: it pumps even on the outstroke. I am not aware of any other pump with comparable specs. Typical mini pumps require 200-300 strokes for 7 bar, and a large pump such as Silca Impero requires 20 kgf force for 7 bar pressure.
I'm worried that the pumps in the small cache could fail over time due to natural degradation of materials. I store the pumps indoors shielded from sunlight. If all of the pumps in the cache fail due to natural degradation of materials, I'm left with no working pump and no possibility to purchase a pump having similar specs, because no other mini pump manufacturer has realized how to build a mini pump that pumps a tire quickly in few strokes with little force.
Is my worry justified? Can a pump that is not being actively used fail?
Due to their complex construction, it may not be feasible to disassemble and repair a failed pump.