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Burning rates and final residues evaluated by flame spread tests performed in horizontal configuration (a) and Heat Release Rate (HRR) plots as a function of time measured by cone calorimetry tests (b). PU: untreated polyurethane foam; 5 BL CH/P-CNF: foam treated with 5 bi-layers of chitosan and phosphorylated cellulose nanofibrils. Reprinted with permission from [55]. Copyright 2018, Elsevier.
