This research presents an exploration of a demountable gasketed vapour chamber. The utilization of a gasketed vapour chamber assembly technique offers considerable flexibility in the assembly and disassembly processes, ensuring that the thermal performance of the vapour chamber remains uncompromised. Moreover, modifications to the wick structure, such as altering the wick type or adjusting surface wettability, can be easily implemented on the same sample of the vapour chamber. This advantage greatly enhances the prospects for lab-scale research. Prior to conducting the performance testing trials, the vapour chamber underwent vacuuming and filling processes. An absolute vacuum of 30 mm of Hg was established inside the chamber, and the vacuum level was continuously monitored. Comparing performance of different configurations, the thermal resistance of the aluminium grooved wick vapour chamber with a 150% filling ratio of acetone was found to be the lowest at 1.416 °C/W, while the aluminium solid plate of the same size, exhibited a thermal resistance of approximately 2.45 °C/W at 20 W, making it roughly 74% higher than the vapour chamber. Increasing the heat load resulted in improved cooling performance. Moreover, the aluminium grooved wick vapour chamber with a 150% filling ratio demonstrated superior temperature uniformity compared to the solid plate.