The OE-MNR was then compounded using the phenolic system. This compounding formulation is shown in Table 1. Various chemicals were mixed with the OE-MNR using a two-roll mill at room temperature and a mixing schedule as described in Table 2. The oil-extended rubber compounds were later used to prepare dynamically cured MNR/HDPE TPVs by blending them with the HDPE in an internal mixer, Brabender Plastcorder model PLE331 (Brabender OHG Duisburg, Germany) at 180 °C, a rotor speed of 60 rpm and a fill factor of 80%, based on the mixing step described in Table 3.