This whitepaper provides a comprehensive comparison between six high-performance engineering plastics: PTFE (Polytetrafluoroethylene), PFA (Perfluoroalkoxy), PEEK (Polyether Ether Ketone), PPS (Polyphenylene Sulfide), PVDF (Polyvinylidene Fluoride), and PI (Polyimide). The analysis focuses on key performance indicators such as chemical resistance, temperature tolerance, mechanical properties, and cost-effectiveness across various industrial applications.