This is a high-quality PEEK insulator and PTFE-PFA adapter for isolating the heat generated from the heater block of a 3D printer\’s extruder. PEEK is a thermoplastic that is stable at very high temperatures, common applications include aerospace and other high-pressure high-temperature applications. Specification High-temperature resistance up to 285C Excellent toughness with high rigidity and fatigue resistance Self-lubrication, wear resistance, has the best slide performance in all the plastics Low coefficient of friction Excellent resistance to hydrolysis Excellent chemical resistance, similar to nickel steel Shipping List 1x Peek Insulator