The calcified green macroalga, Halimeda macroloba, is a source of bio-based calcium carbonate which can be used as a filler in starch foam tray. In the first part of this study, the composition and structure of calcium carbonate of this species were investigated using Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), Energy dispersive X-ray spectroscopy (EDX) and Scanning election microscopy (SEM). The morphology of the macroalgal powder particles was rod-like and organic materials (e.g. polysaccharide) and calcium carbonate (aragonite form) were present. The second part of the study investigated the effects of calcium carbonate from H. macroloba on the properties of starch foam tray and compared them with the properties of starch foam tray filled with commercial CaCO. Interestingly, the composites starch foam trays with macroalgal powder had better impact strength than starch/commercial CaCO composite foam trays. Moreover, the macroalgal powder affected the thermal properties of the starch foam tray equally as well as commercial CaCO. However, the macroalgal powder caused more significant changes in the color parameters and the whiteness values of starch foam tray than commercial CaCO.
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