The achievement of high impact strength has a basic influence on the further development of lightweight container glass. Eleven non-returnable flint glass water bottles, produced by the NNPB process were tested for impact strength by repeated hitting on the upper contact area on the shoulder. Four different plunger materials were tested in a 12-section AIS Emhart machine. The test run was structured in an experimental and ananalytical part. The paper includes graphic and diagrammatic interpretations concerning impact strength, the elements from the plunger materials contained in the glass and furthermore, the change in the chemical composition of the plunger material after use. The aim of this analysis was to find an ideal plunger material, which satisfies the requirements of higher strength for lightweight glass containers.
