This research focuses on the physical, chemical and morphological characterisation of the coconut shell activated carbon (CSAC) with different milling hours. It will be compared with carbon black, N220 in order to access the potential of CSAC as replacement filler for carbon black. Coconut shell activated carbon was produced through the process of pyrolysis at 850°C and impregnated chemically using potassium hydroxide, KOH. Milling process was conducted with different milling hours (0 h, 4 h, 24h and 36 h). Particle size analysis, surface area, x-ray diffraction (XRD), Scanning Electron Microscopic with Energy Dispersive X-ray Spectroscopy (SEM-EDS) and Fourier Transform Infrared Spectroscopy (FTIR) were performed in order to compare physical, chemical and morphological characteristic of carbon black, N220. Based on the results, utilization of the milling process of all CSAC samples were successful in decreasing the particle size, surface area, and pore volume but the average pore size increased.