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The aim of this study is to quantify how much a real Fallhammer deviates from the idealised functioning, and what the differences between different Fallhammers in different laboratories are. Such a comparison has never been done and data have not been collected in a consistent way. Further it is the aim to develop guidance on the mechanical properties of the Fallhammer, which can be used for internal quality control, validation of the correct functioning of the Fallhammer, and preparation of Round-Robin tests. An established and verified mechanical status of a Fallhammer would greatly improve the quality and comparability of results and Round-Robin tests on the impact sensitivity of explosives.
Examinations of the mechanical properties of the BAM drop hammer and the BAM friction test were done recently. In order to validate the correct functioning of both tests, usually Round-Robin tests are done with selected test substances. A relatively large spread of the results including some outliers is usually accepted and attributed to the nature of the tests. The author asked, however, in how much the mere mechanical properties could already differ between different institutes, even when no substance is involved (dry runs). A thorough inter-laboratory study was done for the drop test, and results for the friction test are on its way. The current state of these investigations will be presented.