CFC sagger is high-temperature structural materials featuring carbon fibre reinforcement and a carbon matrix substrate. They exhibit characteristics such as high-temperature resistance, low density, and high thermal conductivity. Capable of withstanding temperatures exceeding 3000°C for short durations, their thermal conductivity is 1.5 times that of graphite. Resistant to acid and alkali corrosion, they are suitable for inert gas environments and offer a 40% weight reduction compared to traditional corundum crucibles.