The modern electrical industry in Indonesia faces escalating energy demands, projected to reach 1,413 Terawatt Hours by 2060. Meeting these demands necessitates enhancing the quality of electrical transmission systems, particularly insulators, with a focus on local materials to reduce dependency on imports. Porcelain Alumina Ceramic Insulators (PACI) offer promising alternatives due to their high resistivity and mechanical strength. This study investigates PACI synthesis using locally sourced materials: kaolin, ball clay, alumina, and feldspar. Chemical analysis confirms alumina as the primary component (99.7% Al₂O₃), while other materials contribute to silica content. Fabrication involves crushing, drying, grinding, sieving, and sintering at 1280 °C, yielding specimens (K1S, K2S, K3S). Material characterization employs XRD, XRF, SEM and electrical tests reveals phase compositions, morphological changes, and electrical properties. K3S, rich in feldspar, exhibits superior material strength (74.62 N/mm²) and hardness (190 N/mm²) with limited conductivity. Utilizing local resources for PACI production promises economic benefits and reduces import dependence. This study illuminates the interplay between material composition and resulting properties, offering insights into ceramic synthesis for improved electrical infrastructure.

Keywords: Local raw materials, Porcelain alumina ceramic insulators, Sintering process, X-ray diffraction (XRD) analysis, Scanning electron microscopy (SEM), Electrical properties.