Carbon fiber precursor filaments are not utilized directly in their raw form; rather, they serve as critical precursor materials for the production of carbon fiber. Their quality directly dictates the mechanical properties of the resulting carbon fiber, and their downstream applications are realized through the carbon fiber itself. Key application sectors include aerospace, wind turbine blades, sports and leisure equipment, and pressure vessels.
In the aerospace sector-a core domain for high-performance carbon fiber-small-tow precursor filaments are predominantly used. Small-tow filaments remain the central sub-segment within the global market for PAN-based carbon fiber precursors. The aerospace and defense industry currently constitutes the most critical and primary source of demand for PAN-based carbon fiber precursors, accounting for approximately 49.22% of the market share in 2024. The production of small-tow carbon fiber necessitates the use of expensive, specialized polyacrylonitrile (PAN) precursor filaments, and the associated manufacturing technologies are subject to strict confidentiality.
In the industrial and civil sectors, large-tow precursor filaments are instrumental in reducing costs and expanding the scope of industrial applications. The developmental trajectory for large-tow precursors is primarily focused on meeting industrial and civil requirements. The large-scale production of 24K and 48K tow products is specifically designed to address this demand. Consequently, the development of large-tow or "jumbo-tow" products possessing superior mechanical properties has emerged as a pivotal objective in the industrial advancement of carbon fiber technology.
The cost of precursor filaments constitutes a significant portion of the total cost of carbon fiber, making it a critical factor influencing the widespread adoption of carbon fiber in end-use applications. Currently, within China's domestic carbon fiber industry, precursor filaments account for a substantial share of production costs-reaching as high as 60.26%. Specifically, the cost associated with the preparation of these precursor filaments accounts for approximately 51% of the total production cost. The preparation of precursor filaments is considered the "vital nexus" of carbon fiber production, as the costs incurred during this specific stage represent nearly half of the overall production expenditure.
To broaden the scope of carbon fiber applications, it is essential to develop lower-cost precursor filaments to facilitate the cost-effective production of carbon fiber. Research into novel, low-cost precursor materials encompasses textile-grade polyacrylonitrile, melt-spun polyacrylonitrile, polyethylene, and lignin. Furthermore, bio-based raw materials-such as lignin-are garnering increasing attention from researchers.
The transformation of precursor filaments into finished products through collaborative efforts across the industrial value chain represents a pivotal stage within the broader carbon fiber industry ecosystem.
