Vapour permeability according to Eu. Ph.



I am assigned to conduct vapour permeability testing on plastic bag products for blood storage. The test requires a storage of samples for 21 days under the following environmental conditions: (5+-1)°C and (50+-5)% RH.
Any metrology expert can recommend me strategies to achieve or monitor these conditions? I am unable to find a climatic chambers able to operate in such narrow range of temperatures and humidity and, in addition, it is practically difficult demonstrate with such equipments the T and % RH are stable and homogeneous during testing.

I am open to read your valuable advice, thank you.
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