With this test method, it can also be tested for discontinuities (cracks, porosities) in castings. The prerequisite for the successful application of the method is that the imperfections on the material surface are exposed to the surface. Evaluation of the test surfaces is carried out in daylight under conditions greater than 500 lx on the workpiece.

The leak detection criteria of the impact test test that can be performed under practical test conditions are about 10-5 to 10-4 Pa * m³ / s (10-4 to 10-3 mbar * l / s).

In the test methods used in our equipment, the weld or casting surface area to be examined for impermeability is wetted with a foam-forming test tool.