## 4 Discussion  
The visual assessment of the plates surfaces and the resulting number of grooves per measurement section are subject to a high degree of uncertainty due to the difficulty in identifying individual grooves (especially for Julius Peters plates). The obtained number of grooves for each plate type is similar due to the standard deviation value. Nonetheless, the results of this assessment highlight the unevenness of the tested surfaces. Therefore, from all tested plate types new OZM plates are mostly recommended. During the roughness measurements, it was found that the Julius Peters plates do not meet the requirements of the standard EN 13671-3:2005. The individual deviation values from the plate profile are not within the range of 5 to 19 \(\upmu\)m. The thickness of the plates is also inappropriate. Therefore, the Julius Peters plates may not be suitable for measurements according to this standard. Plates from other manufacturers meet the standard requirements. No major differences in sensitivity measurements between the OZM plates from the new and the old batches were noticed, despite the discrepancies in the regularity of surfaces and ease of groove identification. Taking into consideration standard deviation, there is no huge divergence in measured \(Ra\) (10.89 \(\pm\) 1.60 \(\upmu\)m for the old batch and 9.87 \(\pm\) 1.01 \(\upmu\)m for the new one). \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Plate Type**} & **Sensitivity (EN** & **50\% Point** & **60\% Point** & **60\% Point** \\  & **13631-3) [N]** & **(STANAG 4487)** & **\(Ra\) (Mean Value)** & **\(Ra\) Range [\(\upmu\)m]** & **60\% Point** \\  & **13631-3) [N]** & **(STANAG 4487)** & **\(Ra\) (Mean Value)** & **\(Ra\) Range [\(\upmu\)m]** & **60\% Point** \\  & 64 & 67 \(\pm\) 9 & 6.07 \(\pm\) 0.79 & 4.76 to 7.80 & 16 \(\pm\) 2 \\  & 60 & 73 \(\pm\) 21 & 10.89 \(\pm\) 1.60 & 7.99 to 14.44 & 16 \(\pm\) 3 \\  & 64 & 75 \(\pm\) 19 & 9.87 \(\pm\) 1.01 & 7.69 to 12.83 & 18 \(\pm\) 2 \\  & 56 & 69 \(\pm\) 9 & 9.67 \(\pm\) 1.07 & 6.67 to 12.47 & 15 \(\pm\) 2 \\  & 80 & 121 \(\pm\) 29 & 5.07 \(\pm\) 1.22 & 2.99 to 7.14 & Not applicable \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Friction sensitivity of penthrite for all plate types. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Explosive**} & **[PERSON] et al. [5]** & **50\% Point-** & **50\% Point-** & **50\% Point** \\  & **[PERSON] et al. * [25]** & **[PERSON] et al. * [26]** & **Range-STANAG 4487 [10]** \\ \hline Hexogen & 120 & 127 & 127 & 110 to 185 \\ Penthrite & 60 & 75.5 & 75.1 & 56 to 102 \\ \hline \hline \end{tabular}  
* Obtained using the probit analysis.  
\end{table} 
Table 7: Friction sensitivity—RDX and PETN. All figures given in N.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Plate Type**} & **Sensitivity (EN** & **50\% Point** & **60\% Point**Analysis of the generated by the Mitutoyo software profiles indicates, that on average, the Julius Peters plate deviations have the lowest values (up to 20 \(\upmu\)m with several values not exceeding 25 \(\upmu\)m). The new batch of OZM plates is characterized by single deviations with large values (up to 40 \(\div\) 60 \(\upmu\)m), while the average deviations reach the level from 20 to 30 \(\upmu\)m; for the old OZM batch, the average deviation level is similar, while the single deviations reach 60 \(\upmu\)m. For Deltima plates, the largest deviations do not exceed 50 \(\upmu\)m with an average level of 10 to 20 \(\upmu\)m. These observations are convergent to the measured roughness parameters. The plate profiles are not completely uniform, with noticeably higher profile deviations or various deviation widths observed in certain areas of the plates. The presence of such irregularities can lead to the accumulation of excess samples, which may distort the results of the sensitivity test.