The objective of this study is to investigate the effect of the rice husk ash (RHA) layer on the physical and compression properties of macroballoons in syntactic foam. The epoxy mixture was used to coat the surfaces of the expanded polystyrene (EPS) beads template, and the beads were rolled on the RHA and left at room temperature to produce E1RHAM macroballoon. The procedure was repeated to produce the second layer (E2RHAM) and third layer (E3RHAM) of the RHA macroballoon. The macroballoons were then post-cured in the air-circulating oven to shrink the EPS beads to produce hollow structures. The macroballoons were embedded in the epoxy mixture to produce epoxy syntactic foam. The syntactic foams with E1RHAM, E2RHAM, and E3RHAM were characterized in terms of physical and compression properties, respectively. It was found that E2RHAM exhibited the highest compressive stress and compressive modulus followed by E1RHAM and E3RHAM. The wall thickness of E2RHAM is 1.405 mm followed by E1RHAM at 0.745 mm and E3RHAM at 1.0701 mm. E2RHAM also has compressive strength and compressive modulus at 37.5 MPa and 925.03 MPa respectively followed by E1RHAM at 25 MPa and 642.86 MPa, and E2RHAM at 16 MPa and 168.08 MPa.
