Evacuable flexible leakage test chamber

An evacuable flexible test chamber for a leakage test of a test piece, said test chamber comprising a wall surrounding a test chamber volume, wherein

• at least a portion of said wall is made up of two layers of wall material of which at least a layer facing said test chamber volume is made from a flexible material, and between said two layers an overpressure as compared to the atmosphere surrounding said test chamber is adapted to be created,
• the wall surrounding the test chamber volume is made up of two partial walls fittingly placed on each other, of which a first partial wall forms a bottom of the test chamber and a second partial wall forms a cover of the test chamber,
• the layer facing away from the test chamber volume is of rigid configuration,
• the layer of flexible material is permanently convexly bulged towards the test piece in an open condition of the chamber, and
• between the two layers, the overpressure as compared to the atmosphere surrounding the test chamber prevails.