Refractory bricks, also known as refractory fire bricks, are made mainly from silica and alumina. Dense refractory bricks can generally withstand up to 1770 Celsius degrees. Therefore, they are widely utilized in many industrial fields. In China, as the cement industry develops continuously and rapidly, the demand of refractory bricks is increasing fast. Not only refractory bricks buyers, but also manufacturers hope to produce high-quality refractory fire bricks. Thus, how to evaluate the performance of dense refractory bricks becomes a popular topic.