Core Insights - Material substitution is a key method for achieving lightweight design in humanoid robots, with major manufacturers already implementing this approach [1][3] - Aluminum alloy remains the primary material for lightweight applications in the automotive sector, while magnesium alloy is emerging as a new contender due to its superior performance and favorable price ratio [2] - High-end engineering plastics, particularly PEEK, PPS, and LCP, are increasingly replacing traditional metals in humanoid robots, contributing significantly to lightweight design [3] Industry Overview - Lightweight design can be achieved through structural optimization and material substitution, addressing four major pain points: enhancing battery life, optimizing energy efficiency, alleviating heat dissipation issues, and improving operational flexibility [1] - The injection molding market for engineering plastics shows promising prospects, with PEEK, PPS, and LCP being highlighted for their exceptional properties [3] Company Recommendations - Aikodi (600933): Expanding lightweight product categories and establishing a dual-driven development model [4] - Xingyuan Zhuomei (301398): Focusing on magnesium alloy die-casting core technology to drive lightweight growth [4] - Moulding Technology (000700): Targeting the lightweight path of substituting plastics for steel with high-quality customer resources [4] - Hengbo Co., Ltd. (301225): A national specialized small giant entering the PEEK lightweight sector through joint ventures [4]