To further explain this difference, comparing the rate of temperature change, Figure , the thin 0.8 mm coating does not absorb heat for as long as 1.5 mm thick or 2.0 mm thick coating. To assess the effectiveness of the micro-capsule PCM-based coatings, these results have been compared to composite PCMs (CPCMs, Table ) which have been extensively researched as a potential solution for a passive BTMS and most closely resemble the coating that has been used in this study. CPCMs make use of porous materials to house the PCM to avoid leakage during phase change, and have been modified to increase the thermal conductivity of the material.