Graphite felt is a rigid, porous carbon material made from polyacrylonitrile (PAN) or asphalt-based carbon fibers, processed through needle-punching, carbonization, high-temperature graphitization (2000~3000°C), and resin impregnation curing. The fibers have a three-dimensional interlaced structure, with a density typically ranging from 0.3 to 0.8 g/cm³. It combines the high-temperature resistance of graphite, the mechanical strength of carbon fibers, and the lightweight characteristics of the felt, and is widely used in high-temperature insulation, heat field shielding, and composite material reinforcement.