Chemical Composition: The yellow firebricks are composed of various oxides, including Na2O (1.0%), MgO (0.7%), Al2O3 (12.0%), SiO2 (55.0%), SO3 (1.2%), K2O (3.6%), CaO (20.3%), TiO2 (0.7%), MnO (0.3%), Fe2O3 (4.0%), NiO (0.3%), CuO (0.4%), and ZnO (0.4%).

Physical & Mechanical Properties: The apparent density of the firebricks is 2.15 g/cm³, while the real density is 2.67 g/cm³. They have an open porosity of 19.21% and a water absorption rate of 8.99%. The cold crushing strength is measured at 42.03 MPa, and the flexural strength (M.O.R) is 9.54 MPa.

Thermal Properties: The refractoriness of the firebricks is greater than 1170°C, with a permanent linear change of less than 1%. Thermal conductivity is 1.28 W/m·K at 200°C and 1.16 W/m·K at 400°C. The heat capacity is 0.76 J/g·K. Thermal diffusivity is 7.9·10^-7 m/s at 200°C and 7.2·10^-7 m/s at 300°C.