Method and device for determining the permeation of a barrier layer

An apparatus for carrying out a method for determining the permeation of a barrier layer on the surface of a container (1), in which the container (1) is put into a pressure-tightly closable vessel (5), it is left to degas after a conditioning time on the side with the barrier layer, the pressure in relation to time is measured and permeation of the barrier layer is determined from those measurement data, characterised in that the pressure-tightly closable vessel (5) and the container (1) disposed therein are evacuated, the pressure of a plurality of substances emitted from the container wall is measured, the gradient of the pressure-time curve based on the change of the pressure in relation to time is determined and the quality of the barrier layer is ascertained as a direct measurement with reference to the pressure-time curve, the apparatus characterized in that

• a first measuring tube (3) is passed out of the internal space (6) of the container (1) to outside the closable vessel (5) and is connected to a pressure measuring device (8;
• 8′) and is connected by way of at least one valve (23, 24, 9) to a vessel emptying conduit (12) connected to a vacuum pump (10), wherein a measuring valve (23) and a finely regulatable valve (24) are connected in series between a connection location (13) of the vessel emptying conduit (12) to the closable vessel (5) and the first measuring tube (3).