Chemical Composition: The red firebricks are composed of various oxides, including Na2O (1.0%), MgO (0.7%), Al2O3 (12.2%), SiO2 (55.3%), SO3 (1.2%), K2O (3.6%), CaO (20.2%), TiO2 (0.7%), MnO (0.3%), Fe2O3 (4.0%), NiO (0.3%), and CuO (0.4%).

Physical & Mechanical Properties: The apparent density of the firebricks is 2.16 g/cm³, while the real density is 2.67 g/cm³. They have an open porosity of 19.16% and a water absorption rate of 8.98%. The cold crushing strength is measured at 42.15 MPa, and the flexural strength (M.O.R) is 9.65 MPa.

Thermal Properties: The refractoriness of the firebricks is greater than 1150°C, with a permanent linear change of less than 1%. Thermal conductivity is 1.32 W/m·K at 200°C and 1.20 W/m·K at 400°C. The heat capacity is 0.74 J/g·K. Thermal diffusivity is 8×10^-7 m/s at 200°C and 7.3×10^-7 m/s at 300°C.