The focus of the investigation was an optical glass characterized by a low glass transition temperature (T_g: 496°C) and a softening point (T_S: 558°C). The thermal conductivity of this glass was explored over the temperature range from room temperature to 600°C.

To achieve this, the thermal diffusivity was determined using the Laser Flash Analysis (LFA) 100 technique, and the specific heat capacity was obtained through Differential Scanning Calorimetry (DSC). By incorporating the provided density, the thermal conductivity was then calculated.

The accompanying plot illustrates the measured thermal diffusivity and the resulting thermal conductivity as a function of temperature. Notably, there is a distinct reduction in thermal conductivity observed between 450°C and 500°C and again between 540°C and 560°C. This characteristic decline can be attributed to the previously mentioned glass transition and softening point, highlighting the significant impact of these thermal events on the overall thermal behavior of the optical glass.