ULTEM

Ultem is a family of high-performance amorphous thermoplastics based on polyetherimide (PEI). The Ultem brand originated with General Electric Plastics and is now produced by SABIC. Ultem resins are valued for a combination of high heat resistance, mechanical strength, and electrical insulation. They exhibit a glass transition temperature around 216–217°C and maintain properties well above room temperature; continuous-use temperatures vary by grade but commonly fall in the range of 170–190°C. Ultem also offers good dimensional stability, flame retardancy, and chemical resistance to many solvents and hydrocarbons. Many grades are inherently flame retardant and meet or exceed UL 94 V-0 in thin sections.

Ultem is an amorphous polymer and can be processed by injection molding and extrusion. Some grades are clear enough to produce transparent parts. A notable grade is Ultem 9085, widely used in aerospace interior components and in additive manufacturing, including 3D-printed parts for aircraft interiors due to favorable flame, smoke, and toxicity characteristics. Other common grades include Ultem 1000 and various reinforced or specialty formulations for medical, electronic, and industrial applications.

Applications span aerospace, automotive, electronics, medical devices, and consumer goods, where high-temperature performance and electrical insulation are important. In 3D printing, Ultem filaments and pellets enable high-temperature parts that withstand sterilization and demanding environments, albeit at higher processing temperatures and costs than more common plastics.