Figure 6From: Natural weathering studies of oil palm trunk lumber (OPTL) green polymer composites enhanced with oil palm shell (OPS) nanoparticles SEM micrograph of OPTL at different weathering durations. (a) PF-NPI before weathering, (b) PF-NPI after 6 months weathering, and (c) PF-NPI after 12 months weathering (500× magnification).Back to article page