Researchers have developed a phosphorus-free and formaldehyde-free lignin-derived phenolic resin that combines intrinsic flame retardancy, robust adhesion and effective fire protection when applied as a coating on wood. The material offers a sustainable alternative to conventional petroleum-based phenolic resins. Conventional petroleum-derived phenolic resins face growing scrutiny due to sustainability concerns, inherent flammability and limited adhesion durability. In response, a recent study introduces a lignin-derived phenolic resin, designated SALG-PR, that is both phosphorus-free and formaldehyde-free. The material …delivers a fully bio-based network with multifunctional performance. The resin exhibits notable intrinsic flame retardancy, reaching a UL-94 V-0 rating and a limiting oxygen index (LOI) of 62.4 %, values comparable to established petroleum-based resins and to previously reported bio-based flame-retardant materials. Direct exposure to a butane torch for 300 s did not lead to burn-through, and infrared thermography confirmed effective localisation of heat within the flame-impinged region, indicating a strong barrier effect.