A non-metallic vapor chamber includes a composite wick structure that fills a non-metallic housing. The composite wick structure provides mechanical strength and structural rigidity to the non-metallic vapor chamber. The composite wick structure includes a first hydrophilic wick portion and a second hydrophobic wick portion. A condensed working fluid flows through the first hydrophilic wick portion from a condensation region to a region proximate one or more thermal energy producing devices. A vaporized working fluid flows through the second hydrophobic wick portion from the region proximate one or more thermal energy producing devices to a condensation region where the vaporized working fluid is condensed for reuse.