For high-speed rotating applications, material selection should prioritize low density, high tensile strength, and nonconductivity, while also considering heat exposure from electrical coils. Glass fiber is suggested as a potential material, but further details about the part's purpose, load conditions, and specific rotational speeds are necessary for a comprehensive evaluation. The discussion emphasizes the importance of understanding the operational context to make informed material choices. Without this information, it is challenging to provide tailored recommendations. Overall, careful consideration of these factors is crucial for optimizing material selection in such applications.