## 3 Results  
### Rubber Hysteresis Results  
Table 2 presents the experimental results with data for static hysteresis, hardness, and dimensions of rubber testing samples. The results show significant differences in hysteresis, from the lowest value of 0.24 to 0.46 for the highest value. The rubber samples used in the conducted research thus had similar hardness with different hysteresis properties, which could significantly vary even for the same hardness. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**No**} & **Rubber** & **Rubber** & **Granite Tile** & **Speed** & **Surface** & **Normal Load (N)** & **Measuring** \\  & **Hysteresis** & **Hardness (Sha)** & **Roughness (\(\upmu\)m)** & **(mm/s)** & **Condition** & **Distance (mm)** \\ \hline
1. & 0.24 & 65 & 0.03 & 50 & Dry & 100 & 300 \\ \hline
2. & 0.35 & 65 & 4.70 & 300 & Wet & & \\ \hline
3. & 0.39 & 65 & & & Soap & & \\ \hline
4. & 0.46 & 60 & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: COF experiment inputs. Rubber OB2280 with a hardness of 65 ShA and rubber hysteresis of 0.46 had a higher COF value under wet and soapy solution conditions for 50 mm/s and 300 mm/s. The COF values were 0.74 and 0.70 for testing speeds of 50 mm/s and 300 mm/s under wet conditions, respectively, while rubber OB221 with the same hardness and a lower hysteresis value had COF values of 0.65 and 0.60 at testing speeds of 50 mm/s and 300 mm/s, respectively. The experimental results for the COF during contact between the rubber sample and the smooth tile are presented in Table 4.  
Rubber OB221 had the highest values of the COF, 1.82 and 1.90, at speeds of 50 mm/s and 300 mm/s on the smooth tile in dry conditions, respectively. The lowest values were for rubber OB290 under soapy conditions, 0.14 for 300 mm/s, and for rubber OB202 also under soapy conditions, 0.10 for 50 mm/s. Figure 4 presents the relationship between the friction coefficient and rubber hysteresis, as well as movement speeds of 50 mm/s and 300 mm/s on the smooth and anti-slip tiles. The highest value of the friction coefficient (1.6-1.9) was obtained on smooth tiles under dry (Figure 4A) contact conditions, while the lowest value (0.1-0.26) was obtained on smooth tiles under soapy contact conditions (Figure 4C). In the case of anti-slip tiles, the highest value of the COF (0.56-1.35) was achieved under dry contact conditions (Figure 4A), while the lowest COF value (0.45-0.68) was achieved under soapy contact conditions (Figure 4C). The COF values were very high under dry conditions, which may indicate that an adhesive component of friction was dominant and had a very high value. With the presence of moisture and soap, the COF value dramatically decreased for the smooth \begin{table}
\begin{tabular}{c c c c} \hline
**Rubber Label** & **Static Hysteresis** & **Hardness (ShA)** & **Dimensions (mm)** \\ \hline Ob 202 & 0.35 & 65 & \(\mathcal{O}35.7\times 18\) \\ \hline Ob 290 & 0.46 & 65 & \(\mathcal{O}35.7\times 18\) \\ \hline Ob 2280 & 0.39 & 65 & \(\mathcal{O}35.7\times 18\) \\ \hline Ob 221 & 0.24 & 60 & \(\mathcal{O}35.7\times 18\) \\ \hline \end{tabular}
\end{table} 
Table 2: Rubber compound characteristics.