Carbon Fiber: Polyacrylonitrile（PAN）-based carbon fiber is a fibrous carbon material with a carbon content exceeding 90% by weight. It possesses the highest specific strength and specific modulus among high-performance fibers. In addition, carbon fiber also combines multiple other advantageous characteristics, including low density, high temperature resistance, chemical corrosion resistance, low electrical resistivity, high thermal conductivity, low thermal expansion, and radiation resistance. It has become an indispensable reinforcement material in fields such as aerospace, low-altitude aircraft, automotive industry, and structural reinforcement.