Palm oil industries disposed of palm oil fuel ash (POFA) as waste by-products and it is used to produce biodiesel. Porcelain is characterized as translucence and vitreous material sintered at a high temperature which consists of clay (for plasticity), feldspar (as flux) and quartz (filler). This research aims to investigate the effect of SiO₂ addition on porcelain production and develop a regression model for optimum physicomechanical properties of porcelain. POFA is dried in an oven, grind and sieved for particle size < 50 μm, the powder is substituted with quartz at 15 wt.% mixed with other compositions of porcelain grind homogeneously in a ball mill and SiO₂ is added to the composition at 1, 2, 3, 4, 5, 10 and 15 wt.% dry pressed into pallets at 91 MPa and sintered at 1150 °C. Physical and mechanical properties of porcelain were determined and a polynomial regression analysis model was developed to predict optimum physicomechanical properties of porcelain. It is revealed that the developed model shows an approximately similar value of bulk density, compressive strength and Vickers microhardness with the laboratory value..
