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Products are pressure and temperature tested to confirm that they are suitable for use as mailing tubes. This work was performed by a third party laboratory. Tubes were filled with a glycerol-water mix and incubated at 25°C in a vacuum chamber at -95kPa for 30 minutes, with no leakage of liquid content observed. Tubes were then incubated at -40°C for two hours at the -95kPA differential, again with no leaking of liquid contents observed. The tubes were then incubated at +55°C for two hours at the -95kPA differential, again with no leaking observed.