Table 5 illustrates at different maximum peak and char residue of the blends vulcanised using various accelerators. Decomposition temperature at first maximum peak (Tmax I) represents the thermal decomposition of natural rubber phase as mentioned earlier whereas the decomposition temperature at second maximum peak (Tmax II) corresponded to the scission of cross-linked R-EPDM. It was observed that the blends showed slightly different on Tmax I that indicated thermal decomposition of natural rubber phase bears no influence upon accelerator types. However, TMTD-vulcanised blends showed an effect on Tmax II. This is due to TMTD-vulcanised blends containing high crosslink density. The higher the crosslink density obtained, the more thermal energy is supplied to overcome the apparent activation energy of decomposition of TMTD-vulcanised blends. Furthermore, the char residue of all blends was not influenced by the accelerator types. This is simply due to the fact that the amount of filler and blend ratios was constant. Therefore, the char residue was mostly unchanged. According to Chakraborty et al. [23], the amount of char is very much dependent on the type and amount of filler. The difference in the filler amount mainly concerns the char formation.