Optimization of Hot Press Parameters to Maximize the Physical and Mechanical Properties of Natural Rubber Composites for Elastomeric Mount

Abstract

Optimum processing parameters are highly important to the performance and processability of an elastomeric mount. A commercial black natural rubber compound of an elastomeric mount investigated for the effect of curing and hot press parameters towards maximizing the physical and mechanical properties. The parameters such as the pressing temperature (140 – 180°C), pressure (100-140 kg/cm²) and curing time (5 to 15 minutes) screened using a response surface methodology technique via a two level factorial design. These parameters were the independent variables and the tensile properties, hardness and density were the responses. The coefficient of determination, R² values for all responses were very close to the unity of 0.90 – 0.99 hence almost 100% of the variation in the overall system were presented by the model. The optimum calculated values of the tested variables for the maximum physical and mechanical properties were found to be at a pressing temperature of 140 °C, pressure of 140 kg/cm² and a curing time of 15 minutes with a predicted tensile strength of 21.74 MPa and hardness of 15.43 Shore A.