Why can stoneware be fired stronger than earthenware?

Stoneware can be fired at higher temperatures than earthenware due to its unique composition, which typically includes a higher percentage of kaolin and other strong clays. This allows stoneware to vitrify more thoroughly, resulting in a denser and more durable product. The higher firing temperatures also facilitate the development of a glassy phase that enhances strength and resistance to moisture absorption, making stoneware more robust than earthenware. Consequently, stoneware is better suited for functional items like cookware and dinnerware.