Thermal conductivity k-values can be determined from room temperature to 1500 ◦ C, or the maximum service limit of the refrac- tory, or to the temperature at which the refractory is no longer
dielectric. The values stated in SI units are to be regarded as standard. The data were taken from the data logger and thermal conductivity was calculated using the software from the เเรมด้า-instrument. Thermal conductivity was calculated using the following equation.