Ultem ® / PEI (Polyetherimide)Ultem Plastic Most noteworthy, Ultem ® is a high-strength amorphous polymer with excellent heat and flame resistance, (carrying a flammability rating of 94-V-0) with little smoke output. Furthermore, it performs continuously to 340° F, making it superior to commodity plastics such as Nylon and Delrin®. Also, Ultem ® is an ideal solution for applications that require high strength and the ability to withstand high temperatures. Finally, the product also suits applications that require consistent dielectric properties over a wide range of frequencies. Always providing exceptional CNC Machined Plastic Parts through 27 years of experience in plastic production. Most noteworthy, having the ability to accomplish tight tolerances. Furthermore, a great depth of knowledge when CNC milling and turning the huge variety of plastic materials available. And, because Sentinel works solely with plastic, we have a focus that gives us an edge over our competitors in the industry. Being hydrolysis resistant and highly resistant to acidic solutions, and is able to tolerate repeated autoclaving cycles, such as with repeated steam sterilization of reusable medical devices. Ultem ® is widely used in electronics because of its good arc resistance and dielectric constant.