Refractory bricks, also known as refractory fire bricks, are generally made by heating fireclay until it becomes vitrified in part. Dense refractory brick is famous for its ability to withstand high temperature, which is a useful property that can be applied in a variety of fields. Therefore, some people may wonder why refractory fire bricks are able to possess the valuable property of thermal resistant. How are refractory bricks made and what are the ingredients used in the making process?