This test concerns mainly the plastic flexible films and laminates. The Gas permeability is the ability of a barrier material to allow gases (O2, N2, CO2 etc.) to permeate through it in a specific time. Gas permeability may vary with temperature, humidity, pressure and specimen thickness. G2/132 is based on the differential pressure method and is professionally applicable to the determination of gas permeability of film specimens. It is equipped with three diffusion cells, which could generate test results of three equivalent specimens at one operation.