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In this study, it is aimed to improving core material by using eloxal sludge for production B2 composite panel. The calcination study of eloxal sludge which arises from anodic oxidation process has a highest Al2O3 percentage by weight was performed with different temperature and time. It was focused how will be used the eloxal sludge such as relative humidity, dried or calcine because of tend to agglomerate structure. Optimal calcine eloxal sludge form was obtained at heat treatment regime with 700 C-0 and 270 minutes. The milling process with a different time was performed for obtaining fine grain size distribution. Also it was aimed to investigate possible agglomerate form in the polyurethane. The X-Ray Diffraction (XRD) and particle size analysis were performed to understand detailed structural analysis. Grain size distribution was obtained 306 mu m, 247 mu m and 203 mu m for different milling time. The eloxal sludge was respectively doped with different percentage with 15 % and 6 % in the polyurethane for obtaining core material. . B2 composite panels were produced as 1250-1500 mm as a standard. The mechanical properties were measurement for different doped of eloxal sludge. The highest mechanical properties was obtained by using 15 % eloxal sludge has a 247 mu m when it was observed that surface defects such as air bubbles. Also the thickness of the composite panel was measurement for all samples with 3.8 mm-4.2 mm.