Figure 6 displays the trend of rubber-filler interactions (Qf/Qg) of RHP incorporated-NRLFs. It is known that the lower the Qf/Qg value is, the higher the extent of interaction between the filler and matrix is (Ismail et al. 1999). From the results, it can be concluded that the addition of RHP caused a reduction in the Qf/Qg value, meaning that the value of Qf/Qg continuously decreased with increasing amounts of RHP filler. This explains why the RHP filler provided a good rubber-filler interaction in the RHP-incorporated NRLFs. A similar study with rattan powder as the filler in NR compounds has been reported (Muniandy et al. 2012). Increasing the amount of RHP filler contributed to the reduction of filler-filler interactions and the enhancement of filler-matrix interactions. This increased the possibility of crosslinks formation in the rubber chain, thereby causing better interactions between the RHP and NRL matrix. Results of this study were further supported by morphological evidence (Ramasamy et al. 2012)