Is fireclay a form of vitreous china?
Fireclay and vitreous china are not the same. However, the differences are small. Fireclay is a combination of vitreous china that has greater amounts of quartz and feldspar in the clay this allows the fireclay to be approximately 30% heavier than regular clay. These characteristics allow for a durable, smooth, flat surface on large fixtures not attainable with standard vitreous china. Fireclay is also fired at a much higher temperature than vitreous china.
