Permeation

The Permeation of films and membranes can be measured with any gas or liquid. The method uses a central module which is separated by the test film: the testing gas is fed on the one side of the cell and the permeated gas is carried to the detector by a sweep gas. The testing medium (liquid or gas) is situated in the inner white pipe and the permeate is collected in the space between the pipe and the glass wall. It is transported by a sweep gas (connected to the upper and lower joint) to an analyzing device.
Permeation in daily Life, example in
* Packaging the permeability of the package (materials, seals, closures, etc) needs to be matched with the sensitivity of the package contents and the specified shelf life. Some packages must have nearly hermetic Seals while other can (and sometimes must) be selectively permeable. Knowledge about the exact permeation rates is therefore essential.
* Tire Air pressure in tyres should decrease as slowly as possible. Therefore it is good to know which gas permeates least through the rubber wall.
* Insulating material: Water vapour permeation of insulating material is important as well as for submarine cables to protect the conductor from corrosion.
* Fuel System To meet legal regulations, it is essential to use barrier materials for fuel hoses and tanks.