## 3 Results and Discussion  
The measured values from the experiments (averages of five measurements) are shown in Figures 4-6 for the chemical loading of the suit samples and in Figures 7-9 for the physical loading of the suit samples. As shown in Figure 8, the biggest decrease in mechanical stress was observed for sulfuric acid: it reached \(-\)23.17 MPa, which was 42.61%. More moderate decreases of \(-\)27.05 and \(-\)25.70 MPa were recorded for nitric acid and hydrogen peroxide, which were equivalent to 14.71 and 13.98%, respectively. The smallest decrease in mechanical stress was recorded for dimethyl sulfoxide (\(-\)19.86 MPa), which was equivalent to 10.80%. All the applied chemicals caused a decrease in mechanical stress, but not to the same extent [29; 30]. As was expected, the greatest decrease in mechanical stress was caused by sulfuric acid. Figure 4: Average values of the mechanical stresses under the action of the studied/selected chemicals. Figure 5: Average strain values on exposure to the studied/selected chemicals. Figure 6: Average values of the tensile modulus of elasticity under the action of the above chemicals. In the deformation evaluation, the applied chemicals caused different changes [31, 32]. If, in the previous evaluation criterion, the measured values of mechanical stress were observed to decrease in all cases, for deformation, we observe a decrease (not statistically significant) of only \(-0.01\), which amounts to \(4.2\%\); for the other chemicals, we observe an increase in deformation. For nitric acid, an equally small increase of \(+0.01\) (\(4.2\%\)) was observed. Moreover, for hydrogen peroxide, an increase of \(+0.08\), which amounts to \(37.5\%\), was reported. An increase of \(+0.02\), which amounts to \(8.33\%\), was observed for dimethyl sulfoxide (see Figure 5). For the tensile modulus of elasticity, as for the mechanical stress, a decrease was observed for all the studied chemicals, but it did not follow the same order or have the same values [32, 33]. As can be seen from Figure 9, a decrease of \(-90.58\) MPa in tensile modulus was recorded for sulfuric acid, which was \(39.52\%\). A milder decrease was recorded for nitric acid, of \(-68.12\) MPa, which was \(29.71\%\). For hydrogen peroxide, the largest decrease of \(-107.56\) MPa was recorded, which was \(46.92\%\). For dimethyl sulfoxide, a decrease of \(-75.1\) MPa was observed, which was \(32.76\%\). All the applied chemicals caused a decrease in mechanical stress, but not to the same extent [34]. As we expected, the greatest decrease in mechanical stress was caused by sulfuric acid, because sulfuric acid is a strong inorganic acid with hygroscopic and oxidizing properties. Figure 8: Average values of deformation under physical influences. Figure 9: Average values of tensile modulus of elasticity under physical influences. The physical effect on the chemical-resistant suit material was measured using the same evaluation criteria and then expressed in terms of changes in mechanical stress, strain and tensile modulus of elasticity [35; 36]. When evaluating the change in mechanical stress, a decrease in the values for both physical effects compared to the control sample was observed. For UV exposure, the decrease was 14.74 MPa, which was 27.1%, and for conditions of 65 \({}^{\circ}\)C for 24 h, the decrease was 7.2 MPa, which was 13.24% (see Figure 7). In terms of physical effects, UV radiation had no effect on the deformation, with the same average value measured as for the control sample [37; 38; 39]. In addition, the exposure to heat at 65 \({}^{\circ}\)C for 24 h had very little effect for the change; it increased the deformation by only +0.02, which was 8.33% (see Figure 8). When evaluating the change in tensile modulus, a decrease in values compared to the control sample was observed for both physical effects. For UV exposure, the decrease was 59.32 MPa, which was 25.88%, and for exposure to 65 \({}^{\circ}\)C for 24 h, the decrease was 43.47 MPa, which was 18.96% (see Figure 9).