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Timber, as a construction material, has been widely used for centuries due to its aesthetic appeal, workability, and availability. However, one of its significant limitations is its vulnerability to fire. In the context of building services and maintenance, understanding the fire resistance of timber is critical, as it directly affects the safety, durability, and compliance of structures with fire safety regulations. Fire resistance refers to the ability of a material to withstand fire or provide a certain level of protection to the structural integrity of a building for a specified period. Timber exhibits a complex behavior when exposed to fire, which is influenced by factors such as density, moisture content, species, cross-sectional size, and surface treatment. When exposed to fire, timber undergoes pyrolysis, a chemical decomposition process in which heat breaks down the cellulose, hemicellulose, and lignin in the wood. This process generates combustible gases and char. The char layer acts as an insulating ______ ____ _________ ________ _______ _______ __________.
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