Characterization and ceramic properties evaluation of Lombok clay

Purpose. This research aims to assess the characteristics of ceramics made from Lombok clay to optimize the quality of ceramic products in the Lombok region and surrounding areas. Methods. Methods used to characterize Lombok clay include measuring its chemical composition, loss on ignition, plasticity level and conducting mineral analysis. Additionally, the influence of sintering temperature on clay properties and shrinkage is studied. Findings. The main mineral component of Lombok clay is kaolin, which has a high level of plasticity and a water absorption rate of 7 ± 0.6%. The ceramic body produced from this clay is classified as semi-porcelain, making it suitable for medium-sized tableware manufactured using the rotating technique. Originality. This research highlights the effect of sintering temperature on the mineral transformation of Lombok clay and provides valuable information on its optimal applications. It fills a gap in the literature by providing comprehensive data on clay properties and optimal processing conditions that have previously been underexplored. Practical implications. Lombok clay is used predominantly by small-scale ceramic craftsmen in Lombok and Bali due to its relatively low market price. With the findings of this study, these craftsmen can enhance the quality of their products to semi-porcelain standards by adjusting the sintering temperature.