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Polyethylene glycol (PEG)/zircon (ZrSiO4) composites with various zircon sizes have been fabricated using liquid method. The study was aimed to enhance the thermo-mechanical properties of the PEG matric around its glass temperature. The zircon powder were prepared varying the calcination temperatures, i.e. 500 ºC, 1000 ºC, and 1200 ºC and were analyzed using FTIR and XRD. The powders exhibited pure zircon, increase of particle size and decrease of lattice parameter by increasing calcination temperature. Meanwhile, the PEG/zircon composites and the pure PEG sample have been analyzed using FTIR, XRD, and DMA. Analyses of the FTIR and XRD data confirmed the successful synthesis of the composites. DMA analysis revealed the storage moduli, loss moduli, and tan delta characters from the PEG/zircon composites. The maximum storage moduli and glass transition temperature (Tg) were achieved by the 5 wt% zircon calcined at 500 ºC, while the maximum loss moduli were achieved by the 5 wt% zircon calcined at 1200 ºC.