The Al2O3 content in fireclay bricks is generally above 40%, with Fe2O3 content less than 2.0–2.5%. The mix composition typically consists of 65–85% calcined grog and 35–15% bonding clay. The finely ground bonding clay and milled calcined grog are blended, then combined with coarse grog to form a semi-dry mix, which is pressed at high pressure and fired at approximately 1400 °C, resulting in favorable properties. Fireclay bricks exhibit weak acidity at high temperatures and have relatively poor resistance to alkali slag corrosion. Fireclay bricks are made from readily available materials, offering low cost, high durability, and advantages such as fire resistance, thermal insulation, sound insulation, and moisture absorption.