High Performance > 300°F | Polyetherimide (Ultem®)


ULTEM® is an amorphous thermoplastic polyetherimide (PEI) material which combines exceptional mechanical, thermal, and electrical properties. Natural ULTEM® 1000 (unreinforced) is a translucent amber material. The addition of glass fiber reinforcement to the basic ULTEM®, coupled with Ensinger?s proprietary extrusion techniques, provides the ULTEM® with both greater tensile strength and rigidity while at the same time improving

  • Excellent mechanical strength
    ULTEM® exhibits high tensile strength at room temperature and retains a significant portion of this strength at elevated temperatures.
    Glass fibers further increase high-temperature strength.
  • Outstanding heat resistance
    ULTEM® retains its physical properties at elevated temperatures.
  • Exceptional resistance to environmental forces
    Environmental characteristics of ULTEM® include it?s stress resistance.
  • Inherent flame resistance with low smoke evolution
    Tested internally to UL 94 V-O.
  • High mechanical strength
  • High dielectric strength and stability
    The high dielectric strength and constant values of ULTEM® make it an excellent electrical insulator.
  • Low dissipation factor over a wide range of frequencies
  • Excellent machinability and finishing characteristics
    ULTEM® can be easily machined with conventional metalworking tools, painted, hot stamped, printed, or metallized.

ULTEM® has many applications in medical, electronic/electrical, microwave, automotive, and aircraft industries.

Properties Condition Value   Test Method Comment
Mechanical Modulus of elasticity (tensile test) @ 73°F 900,000 psi ASTM D 638  
Tensile strength at break @ 73°F 18,000 psi ASTM D 638  
Elongation at break @ 73°F 3 % ASTM D 638  
Flexural Strength @ 73°F 28,000 psi ASTM D 638  
Modulus of Elasticity (flexural test) @ 73°F 850,000 psi ASTM D 790  
Compression strength @ 10% strain 30,700 psi ASTM D 695  
Impact strength (Izod) @ 73°F 1.1 ft-lbs/in ASTM D 256  
Rockwell hardness M Scale 110   ASTM D 785  
Thermal Deflection temperature @ 66 psi, 1/4" 414 °F ASTM D 648 1) 1) Injection molded data
Deflection temperature @ 264 psi, 1/4" 409 °F ASTM D 648 1)  
Thermal expansion (CLTE)   1.1*10-5 in/in/°F ASTM D 696 1)  
Thermal conductivity   1.56 BTU-in/hr-ft2-°F ASTM D 2214 1)  
Electrical Volume resistivity 1/16" 3.0x1016 Ω*cm ASTM D 257 1)  
Dielectric strength In Oil 630 V/mil ASTM D 149 1)  
Dielectric strength In Air 770 V/mil ASTM D 149 1)  
Dissipation factor 1 kHz, 50% RH, 73 °F 0.0015 % ASTM D 150 1)  
Dielectric constant 1 kHz, 50% RH 3.7 % ASTM D 150 1)  
Other Moisture absorption @ 24 hrs, 73°F 0.16 % ASTM D 570 1) 2) Injection molded data (0.25 mm thickness)
Moisture absorption @ saturation, 73°F 0.90 % ASTM D 570 1)  
Flammability (UL94)   V-0   2)  

This information is only to assist and advise you on current technical knowledge and is given without obligation or liability. All trade and patent rights should be observed. All rights reserved. Data obtained from extruded shapes material.
TECAPEI ™ – Ensinger Industries, Inc.