Group 1 - The company, Wenzhou Hongfeng (300283.SZ), primarily engages in the research, production, and sales of electrical contact materials, metal-based functional composite materials, hard alloy materials, high-performance ultra-thin lithium battery copper foil, and etched lead frame materials [2] - The company confirmed that its current products and business do not involve PEEK materials, despite PEEK's advantages such as high temperature resistance, high strength, corrosion resistance, and biocompatibility, which make it one of the best-performing engineering plastics [2]