High mechanical strength refers to a material’s stress-bearing capacity before permanent deformation or breaking point. Key Peek Properties and Their Benefits High Mechanical Strength and Stiffness Capable of withstanding high temperatures, it excels in harsh environments and demanding applications, making it a popular choice in the aerospace, automotive, medical, and electronics industries. Polyetheretherketone (PEEK) is a high-performance engineering thermoplastic polymer esteemed for its exceptional mechanical, thermal, and chemical properties.