A study has been conducted on alternative filler materials for solid rubber compounds using chicken eggshells and carbon black. This study varied the amount of filler between eggshells and carbon black by 15:35, 25:25, and 35:15 to determine a good filler composition. Based on the results of XRD testing, it shows that the main content of eggshells is calcium carbonate (CaCO3) and based on the r…