In another vein, with increasing the loadings of either microcrystalline cellulose or TiO 2 fillers, there is a significant trend in the apparent density of RPUF composites in comparison to alkaline lignin, as depicted in Figure 3 a.
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Harnessing Enhanced Flame Retardancy in Rigid Polyurethane Composite Foams through Hemp Seed Oil-Derived Natural Fillers.
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On the other hand, microcrystalline cellulose-based RPUF composite containing melamine FR showed an increasing trend in compressive strength and stiffness effect [ 46 ].