About PEEK|Polyether ether ketone. The premium engineering plastic. Exceptional strength, stiffness, and temperature resistance (continuous use to 480°F). Chemical resistance rivals fluoropolymers. Machines beautifully with standard tooling at moderate speeds. The catch: it costs $50-100+ per pound. Used for aerospace components, medical implants, semiconductor equipment, and oil and gas downhole tools where nothing else can handle the environment. Compare to
Ultem 1000 (similar temperature resistance, much cheaper) and
Torlon 4301 (higher temperature capability).