This paper presents the characteristic and morphology of palm waste (palm slag and palm ash) filled thermoplastic (high density polyethylene (HDPE) and recycled HDPE) composites. Two different particle sizes were used which are in the range from 150 µm to 300 µm defined as coarse and less than 75 µm defined as fine. The palm waste of HDPE and recycled HDPE with 8 different types of sample were prepared using a twin screw extruder with 10 % of filler loading was chosen to produce the composite. The XRF result indicated that palm slag has higher SiO2, but lower CaO content as compared to palm ash. Median particle size analysis showed that fine size palm ash demonstrated lowest d50 and coarse size palm slag showed a comparable value of d50 with coarse size palm ash. The scanning electron microscopy studies showed that coarse size palm slag illustrated better matrix interaction with HDPE and recycled HDPE. The overall result indicated that coarse size palm slag shows comparable characteristic and morphology compared with fine size palm ash in HDPE and recycled HDPE composite.
