Water Vapour Permeability Rate
The permeability kit works as described in EN ISO 7783-1 part 1: “Dish method for free films” and allows the accurate determination of the water vapour permeability of foils and films with the SPS sorption test systems.
The SPS and Vsorp instruments gravimetrically determine the amount of water vapour transmitted through a foil/film with a given surface area and under controlled humidity conditions during a specified period of time.
Simultaneous testing of up to 5 samples is possible. The sample tray with the sample dishes is placed is the test chamber for measurement under controlled conditions (temperature, humidity and flow).
Example of a permeability test performed with commercially available cling film
For further reading please download the Application Note.