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The modified-polyurethane-foam adsorbents for mercury adsorption can typically reduce the potential impact of mercury pollution. This study aims to investigate the essential characteristics of adsorbents, made of castor oil, methylene diphenyl diisocyanate, glycerol, merely modified by zeolite and bentonite addition. Polyurethane foam with optimum performance is further characterized to find out its physical and chemical properties including: functional groups (FTIR), surface morphology (SEM) and specific area (BET). The FTIR characterization show that polyurethane foams without necessary modification typically contains a C = O group as its typical group scientifically shown by its specific wavelength (1654–1516 cm-1, 1680–1514 cm-1, and 1593–1516 cm-1). The modified-polyurethane foam properly contains a C = CH group with a typical wavelength of 3008 cm-1 with zeolite addition. It also shows the visible wavelength of 3007 cm-1 with bentonite addition. The SEM characterization show that zeolite-modified-polyurethane foam properly maintains a smooth and flat structure with small pores, whereas polyurethane foam with bentonite typically has an irregular particle shape. The obtained BET area for sample 60% zeolite, 50% MDI and 40% gliserol is precisely 2.8257 m2/g. Whereas for the narrowest BET area in sample 40% zeolite, MDI 50%, and gliserol 60% is merely 0.773 m2/g.