Investment Rating - The report indicates a positive investment outlook for the polyimide industry, highlighting its potential for growth and development in advanced manufacturing sectors [5]. Core Insights - Polyimide (PI) is recognized as a high-performance aromatic polymer material with exceptional properties such as high-temperature resistance, chemical corrosion resistance, high strength, high insulation, and radiation resistance, making it a critical material in advanced manufacturing [1]. - The polyimide market is projected to grow from approximately 66.4 billion yuan in 2024 to nearly 97.7 billion yuan by 2031, with a compound annual growth rate (CAGR) of 5.9% [5]. Summary by Sections Product Categories - **Polyimide Films**: Core products include biaxially oriented films with characteristics such as ultra-thinness, high-temperature resistance, high insulation, and low dielectric loss, widely used in flexible circuit boards, chip packaging, and aerospace cable insulation [1]. - **Polyimide Fibers**: Produced through dry and wet spinning or electrospinning, these fibers exhibit high strength and temperature resistance, suitable for high-temperature filtration and aerospace composite materials [2]. - **Polyimide Composites**: These materials combine polyimide resin with carbon or glass fibers, offering high-temperature resistance and strength, primarily used in aerospace structural components and precision parts [3]. - **Polyimide Foams**: Created through a reaction between foaming agents and polyimide precursors, these foams are lightweight and provide thermal insulation and soundproofing, applicable in aerospace and high-end construction [4]. Industry Chain - The polyimide industry chain is structured as "upstream raw material preparation - midstream material synthesis - downstream application processing," with significant technological barriers and value distribution favoring high-end raw materials and core preparation processes [4]. - Upstream focuses on the development of high-purity monomer raw materials, which directly influence downstream product performance, with the highest technological barriers historically dominated by foreign companies [4]. - The downstream market spans various sectors, with the electronic information sector being the largest consumer, while aerospace demands high-performance products [5].

Core Viewpoint - The high-performance fiber industry is crucial for national defense, aerospace, and emerging strategic industries, with significant growth potential in China due to government support and technological advancements [1]. Group 1: Carbon Fiber - Carbon fiber, with over 90% carbon content, is essential for aerospace and military applications, with usage in military aircraft ranging from 30% to 65% [2]. - In 2020, global carbon fiber demand was 10.6 kilotons, while China's operational capacity was approximately 3.6 kilotons, with an actual production of about 1.8 kilotons, ranking second globally [2]. Group 2: Aramid Fiber - Para-aramid fiber, developed by DuPont, dominates the market with a significant share, while China is emerging as a new market with a growth rate of around 10% [4][27]. - The global para-aramid fiber capacity was 83.7 kilotons in 2020, expected to reach 94.6 kilotons by 2022, with major production concentrated in DuPont, Teijin, and KOLON [4]. Group 3: Other High-Performance Fibers - Meta-aramid fiber, primarily produced by DuPont, accounted for over 50% of global usage in 2017, with a market size of 6.3 billion yuan in 2020, projected to grow to 10.3 billion yuan by 2026 [6]. - UHMWPE fiber, with a global production capacity of approximately 80 kilotons in 2020, is increasingly used in ballistic protection, with 45% of its total production dedicated to this application [9]. - Polyimide fiber is widely used in high-temperature protective clothing, with significant demand in various industries, including metallurgy and nuclear energy [11]. - PPS fiber, with a global market dominated by Japanese companies, has seen advancements in production technology, enhancing its competitive edge in high-temperature filtration applications [13][38]. Group 4: International Development Trends - The U.S., Japan, and Europe hold a significant advantage in high-performance fiber technology, with the U.S. leading in viscose-based carbon fiber and aramid fibers [24][25]. - The global market for high-performance fibers is characterized by oligopolistic competition, with major players like DuPont and Teijin maintaining a dominant position [4][27].