## 3 Results and Discussion
For example, a decrease around 263% was found for 1% OMT +18% FR, even if the time to PHRR goes three times higher. This substantial decrease agrees with the open literature [6; 9; 10]. If one compares the experimental data with the state of the art, it can be seen that lower PHRR values were obtained also by other research groups (i.e., 1821 kW/m\({}^{2}\) in reference [1], 574 kW/m\({}^{2}\) in [9] and 930 kW/m\({}^{2}\) in ref. [6]) and the phenomenon can be explained by the reABS initial combustion process (i.e., from its preparation process). More exactly, the initial ignifugation of the recycled ABS clearly revealed the influence of the flame retardants incorporated into the material when they compared the thermal properties of pristine ABS and recycled ABS recovered from monitors, microphones, and mice [40]. [PERSON] et al. [41] analyzed recycled ABS using X-ray diffraction and they identified \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & **Total Heat Released** & **Peak Heat Release** & **Time to** & **Resolute** & **Time to** & **Growth Rate of the** \\
**Specimen** & **Per Unit Area,** & **Rate,** & **Ignition,** & **(wt\%)** & **PHRR (s)** & **Burning Intensity,** \\  & **THR (M/m\({}^{2}\))** & **PHRR (kW/m\({}^{2}\))** & **TTI (s)** & & **FIGRA(W/s)** & \\ \hline reABS & 85.52 & 486.05 & 24 & 1.6 & 152 & 3.45 \\ reABS 15\% FR & 64.05 & 150.92 & 21 & 10.7 & 85 & 1.74 \\ reABS 15\% OMT & 82.73 & 364.38 & 23 & 4.1 & 182 & 2.23 \\ reABS 15\% OMT 15\% FR & 71.06 & 139.75 & 28 & 13.5 & 429 & 0.38 \\ reABS 15\% OMT 18\% FR & 67.37 & 128.14 & 33 & 13.1 & 430 & 0.34 \\ reABS 15\% OMT 20\% FR & 62.54 & 132.76 & 42 & 17.7 & 464 & 0.33 \\ reABS 25\% OMT 84.99 & 317.29 & 20 & 6.4 & 215 & 1.66 \\ reABS 25\% OMT 15\% FR & 74.57 & 149.69 & 29 & 15.8 & 434 & 0.39 \\ reABS 25\% OMT 18\% FR & 77.85 & 154.26 & 30 & 17.3 & 429 & 0.41 \\ reABS 25\% OMT 20\% FR & 74.15 & 154.15 & 29 & 18.9 & 475 & 0.38 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Cone calorimeter test results. brominated flame retardants. Plus, the UL-94 test pointed out that recycled ABS obtained V-0 classification and they concluded that several kinds of flame retardants were used [41]. The decrease of PHRR when 1% and 2% OMT is added to the ABS was registered as 25% and 35% respectively. On the other hand, similar results were attained by [PERSON] et al. [42], who added 5% of two types of montmorillonite organically modified and obtained a reduction of PHRR of 39% in the first case and 42% in the second case. They concluded that the process may be influenced by melt viscosity, degradation behavior, and char formation on the sample surface [42]. Therefore, the decrease in PHRR and the increase in TTI proves the synergy between these two components: OMT and FR. Regarding the THR results, when 1% of OMT is added to reABS a decrease of 4% is noticed and this can be attributed to a better dispersability of OMT at lower weight concentrations, as reported also by [PERSON] and [PERSON] [11] and [PERSON] and [PERSON] [9]. Additionally, the experiments performed by [PERSON] et al. [43] showed a similar behavior of THR when 2% triclay III (oligomerically-modified clay) and 6% of triclay III are added to the ABS matrix [38]. The time to ignition results are in line with the open literature [1,9,11]. For example, [PERSON] et al. [1] developed a composite with ABS and 25 wt% APP/AlPi and obtained TTI (i.e., for a 35 kW/m\({}^{2}\) flux) of 30 s for the pure ABS and 25 s for the composite. [PERSON] et al. [9] obtained the same TTI for ABS as that determined in the current work. As discussion, it can be seen that the TTI test results obtained for ABS in combination with FR are lower for both samples FR-reABS. Specifically, TTI for the reABS 15% FR decreased by 3 s while [PERSON] et al. [1] registered a time for ABS 25% FR decrease of 5 s, if compared to the TTI for ABS. This occurred due to the weak thermal stability of the FR (in special AlPi) that starts to decompose at a lower temperature than pure ABS [1].