Table V

Experimental Runs (Stopper B). Shaded Cells Show 1–100% Leaking Vials (Leak)

Storage Conditions	Copper wire diameter (μm)	Storage Time (week)	CO₂ Headspace (number of leaking vials/total vials)	He Leak at –60 °C (number of leaking vials/total vials)	He Leak at –20 °C (number of leaking vials/total vials)	He Leak at RT (number of leaking vials/total vials)
RT	No wire	1	0/10	9/9	6/9	0/7
	20	1	0/10	10/10	10/10	0/9
	60	1	3/10^*	10/10	10/10	10/10
Dry ice	No wire	1	1/10	9/9	1/9	0/10
	20	1	10/10^**	10/10	2/10	3/9
	60	1	10/10^***	10/10	10/10	9/9

↵* Vials stored in same room as dry ice samples; values measured are in the range of 0.07–0.10% (32).
↵** All vials with 20 μm wires exhibit overpressure (>1 atm).
↵*** All vials with 60 μm wires do not exhibit overpressure.