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(a) The HRR curves, (b) the THR curves, (c) the SPR curves, and (d) the TSP curves of the specimens. (e) Digital photographs of specimens during UL-94 testing. (f) Summary of flame-retardant efficiency of PA and lignin, and (g) LOI and UL-94 testing results of the specimens [126]. Copyright 2024, reproduced with permission from Elsevier B.V. All rights are reserved.
