## 4 Experimental Measurements
### Abrasion with the Use of Lubricating CX80 Silicone Grease  
Colorless lubricant with high viscosity creates a protective film with excellent resistance; hence, coverage of the friction surfaces with a thin layer of silicone grease leads to an effective reduction in friction and provides long-lasting protection of the equipment, \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**No. of Measurements** & **1** & **2** & **3** & **4** & **5** \\ \hline Loading—tightening torque \(M_{T}\) (_Nmt_) & 4.0 & 8.0 & 12.0 & 16.0 & 20.0 \\ \hline Emerging axial force \(F_{O}\) (_N_) & 624.8 & 1218.2 & 1789.4 & 2326.7 & 2792.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Measured values in dry abrasion. Figure 8: Dependence of the emerging axial force \(F_{O}\) on time from the EMS Center software. suitable for use on contact surfaces of plastic, metal, ceramics, rubber, etc. It does not stain, does not adhere to dust, and is non-adhesive, facilitating the removal of forms, with an operating temperature of \(-60\) to \(+230\)\({}^{\circ}\)C.  
It is compatible with all kinds of sanitary equipment, including conventional and lever (gas) valves, seals, connectors, fittings, valves, and joints. It can also be used in the clean lubrication of equipment in the textile, paper, and food industries; electric and power distribution equipment (safety protection of electric circuits); power cases that work under extreme temperatures; and the lubrication of links, locks, hinge screws, and sleeves in the automotive industry. Moreover, it protects against corrosion in printing machines where the lubricant comes into contact with paper [17]. It has also been approved by NSF for use in the food industry. The measured values with silicone grease are presented in Table 2 and Figure 9.  
The calculated coefficients of friction \(f^{\prime}\) for the individual tightening torques in abrasion with lubricating silicone grease CX80 are as follows:  
\[ \begin{array}{l}f^{\prime}{}_{S1}=\frac{2\pi\cdot M_{TS1}-F_{S01}\cdot s}{\pi \cdot F_{S01}\cdot d_{s}}=\frac{2\pi\cdot 4\ Nm-9742\ N\cdot 0.0025\ m}{\pi\cdot 974 2\ N\cdot 0.018376\ m}=0.4035\\ f^{\prime}{}_{S2}=\frac{2\pi\cdot M_{TS2}-F_{S02}\cdot s}{\pi\cdot F_{S02} \cdot d_{s}}=\frac{2\pi\cdot 8\ Nm-1945\delta\ N\cdot 0.0025\ m}{\pi\cdot 194 5\delta\ N\cdot 0.018376\ m}=0.4042\\ f^{\prime}{}_{S3}=\frac{2\pi\cdot M_{TS1}-F_{S01}\cdot s}{\pi\cdot F_{S03} \cdot d_{s}}=\frac{2\pi\cdot 12\ Nm-2874\delta\ N\cdot 0.0025\ m}{\pi\cdot 2874 \delta\ N\cdot 0.018376\ m}=0.4110\\ f^{\prime}{}_{S4}=\frac{2\pi\cdot M_{TS4}-F_{S04}\cdot s}{\pi\cdot F_{S04} \cdot s}=\frac{2\pi\cdot 16\ Nm-3823\ N\cdot 0.0025\ m}{\pi\cdot 8323\ N\cdot 0.018376\ m}=0.4121\\ f^{\prime}{}_{S5}=\frac{2\pi\cdot M_{TS5}-F_{S02}\cdot s}{\pi\cdot F_{S03} \cdot d_{s}}=\frac{2\pi\cdot 20\ Nm-4681\delta\ N\cdot 0.0025\ m}{\pi\cdot 4681 \ N\cdot 0.018376\ m}=0.4216\end{array}  \tag{11}\] \begin{table}
\begin{tabular}{c c c c c c} \hline
**No. of Measurements** & **1** & **2** & **3** & **4** & **5** \\ \hline Loading—tightening torque \(M_{TS}\) (_Nm_) & 4.0 & 8.0 & 12.0 & 16.0 & 20.0 \\ \hline Emerging axial force \(F_{OS}\) (_N_) & 974.2 & 1945.6 & 2874.6 & 3823.2 & 4681.6 \\ \hline \end{tabular}
\end{table} 
Table 2: Values determined via measurement with lubricant CX80—silicone grease. Figure 9: Dependence of the emerging force \(F_{OS}\) on time. The actual coefficients of friction \(f\) for the individual tightening torques in abrasion with lubricating silicone grease CX80 are as follows:  
\[