PEI

HPMs – High-performance materials

PEI

Polyetherimide is an amorphous thermoplastic that belongs to the polyimide family. It has good dimensional accuracy across a wide temperature range. This heat-resistant material also exhibits low thermal expansion. It is naturally flame‑retardant and has a fire rating of UL94 V-0. We deliver PEI as sheets and rods.

Physical properties
  Value Unit Test method
Specific gravity 1.28 g/cm3 DIN EN ISO 1183
Average molecular mass N/A
Water absorption, 24/96 h (23 °C) 0.05/0.1 % DIN EN ISO 62
Weather-resistance poor
Combustibility V0 UL 94 DIN EN ISO 527-2
Food safety no
Mechanical properties
  Value Unit Test method
Modulus of elasticity 3200 MPa DIN EN ISO 527-2
Tensile strength 127 MPa DIN EN ISO 527-2
Elongation at break 7 % DIN EN ISO 527-2
Tensile strength at break 35 % DIN EN ISO 527-2
Flexural modulus 3300 MPa DIN EN ISO 178
Flexural strength 164 MPa DIN EN ISO 178
Compressive modulus 2800 MPa EN ISO 604
Compressive strength, 1%/2% 23/41 MPa EN ISO 604
Impact strength (Charpy) 113 kJ/m2 DIN EN ISO 179-1eU
Notch impact strength (Charpy) N/A
Notch impact strength (Izod) kJ/m2 DIN EN ISO 180/2A
Toughness (ball pressure) 225 MPa ISO 2039-1
Toughness (Shore D) N/A
Wear-resistance N/A
Coefficient of friction (against steel) N/A
Thermal properties
  Value Unit Test method
Glass-transition temperature 216 °C DIN 53765
Melting point N/A
Operating temperature (instantaneous) +200 °C
Operating temperature (continuous) 170 °C
Operating temperature (minimum) N/A
Thermal expansion coefficient, 23–60 °C 5 10-5 K-1 DIN EN ISO 11359-1;2
Thermal expansion coefficient, 23–100 °C 5 10-5 K-1 DIN EN ISO 11359-1;2
Specific heat capacity 1.2 J/(g×K) ISO 22007-4:2008
Thermal conductivity 0.21 W/(m×K) ISO 22007-4:2008
Electrical properties
  Value Unit Test method
Surface resistivity 1014 DIN IEC 60093
Resistivity 1014 Ω×cm DIN IEC 60093
Dielectric strength N/A
CTI value N/A
Optical properties
  Value Unit Test method
Light transmittance N/A
Refractive index N/A
Optical errors N/A
Abrasion-resistance, 100 rotations with 500 g N/A

Additional downloads

Delivery selection sheets, bars
Specific gravity 1.28 g/cm3
Service temperature N/A … 170 °C
Price category €€€+ (>€50/kg)

Special properties

  • dimensional accuracy across a wide temperature range
  • low thermal expansion
  • good heat-resistance
  • good resistance to radiation
  • food-grade product

Applications

electronics industry, precision engineering, pharmaceutical industry, food and drinks industry

Standard colours

amber

Premade pieces

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Commonly known brands

Duratron® PEI, SUSTAPEI®, TECAPEI®, ULTEM®1000, ZELLAMID® 1000