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Polyetherimide (PEI), also trademarked as Ultem®, is an amorphous, amber-to-transparent thermoplastic. Rated for continuous use in temperatures up to 356° F (180° C), it also features high tensile strength along with good flame and chemical resistance.

Ultem PEI is often used instead of polysulfone and is commonly specified for aerospace, automotive, medical, and packaging applications. The glass filled grade, Ultem 2000, offers increased strength, stiffness and dimensional stability while maintaining many of the useful characteristics of basic Ultem. The glass reinforcement yields a product with an exceptional strength-to-weight ratio and increased tensile strength. Glass-filled grades appear tan or greenish in color and are available in limited sheet and rod sizes.

Additional formulations (i.e., carbon filled) and variants within these grades (resistance to wear, chemical, high heat, stains; static dissipative, and hydrolytically stable) are available to meet specific application demands. An Emco Industrial Plastics representative can help you choose the correct material to meet your application needs.

Brand Names

  • Ultem 1000®
  • Tempalux®
  • TECAPAI CM XP530 Glass Filled
  • TECAPAI CM XP730 Carbon Filled
  • Hydex®
  • Meldin®
  • Semitron® ESd 420
  • Hydel® PEI-7

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.

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At a Glance

Generic Name

Available In
Sheet, Rod, Film

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Technical Information

Stock Products Properties

Stock Products

Sheet 3/32”–4” 12” x 12”, 24”; 24” x 24”, 36”, 48”, CTS Tan/Green
Rod 1/4”–8” dia. 96” L; CTS Green
Film 0.001”–0.040” th. Up to 27” roll width; CTS lengths

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.055
Water Absorption, 24 hrs % D570 0.18
Mechanical PropertiesUnitsASTMResults
Tensile Strength psi D638 16,500
Tensile Modulus psi D638 475,000
Tensile Elongation @ Break % D638 80
Flexural Strength psi D790 20,000
Flexural Modulus psi D790 500,000
Compressive Strength psi D695 22000
Compressive Modulus psi D695 480.000
Hardness, Rockwell R D785 R125/M112
IZOD Impact Strength Notched ft-lb/in D256 0.5
IZOD Impact Strength Un-notched ft-lb/in D256
Thermal PropertiesUnitsASTMResults
Heat Deflection Temp at 66 psi °F D648
Heat Deflection Temp at at 264 ps °F D648 392
Melting Temperature °F D3418 419
Max Operating Temp °F D3418 340
Thermal Conductivity BTU-in/ft²-hr-°F C177 0.9
Flammability Rating UL94 V-O
Electrical PropertiesUnitsASTMResults
Dielectric Strength, 1/8″ th. V/mil D149 830
Dielectric Constant @ 1MHz D150 3.15
Dissipation Factor @ 1MHz D150 0.0013
Surface Resistivity ohms/sq D257
Volume Resistivity, 50% RH ohms/cm D257 6.7 x 10¹⁷
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