Poly(pyromellitimide-1,4-diphenylether)

Alternative and trade names
ODA-PMDA, PMDA-ODA, Kapton, Vespel, Apical
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Description

Polyetherimide (PEI), direct-formed parts are resistant to thermally harsh environment, creep, impact, and wear, and friction at high pressures and velocities.

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyTemperatureValueComment

Coefficient of friction

0.29 [-]

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Steady state, unlubricated in air (PV=0875 MPa*m*s⁻¹), for static in air: 0.35

Density

23.0 °C

1.43 g/cm³

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ASTM D792

Limiting oxygen index

23.0 °C

53 %

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ASTM D2863

Water absorption

23.0 °C

0.24 %

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ASTM D570, 24h, for Immersion 48h at 50°C: 0.72%

Mechanical

PropertyTemperatureValueComment

Compressive modulus

23.0 °C

2413 MPa

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ASTM D695

Compressive strength

23.0 °C

24.8 MPa

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ASTM D695, 1% strain, for 10% strain: 133.1 MPa

Elongation

23.0 °C

7.5 %

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ASTM D1708

260.0 °C

6 %

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ASTM D1708

Flexural modulus

23.0 °C

3.1 GPa

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ASTM D790

260.0 °C

1.72 GPa

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ASTM D790

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Flexural strength

23.0 °C

110.3 MPa

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260.0 °C

62.1 MPa

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Hardness, Rockwell E

23.0 °C

45 - 60 [-]

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ASTM D785

Hardness, Rockwell M

23.0 °C

92 - 102 [-]

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ASTM D785

Impact strength, Izod notched, ASTM

23.0 °C

42.7 J/m

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Impact strength, Izod unnotched, ASTM

23.0 °C

747 J/m

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Poisson's ratio

23.0 °C

0.41 [-]

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Shear strength

23.0 °C

89.6 MPa

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ASTM D732

Tensile strength

23.0 °C

86.2 MPa

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ASTM D1708

260.0 °C

41.4 MPa

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ASTM D1708

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

5.4E-5 1/K

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ASTM D696, @23-300°C, 45*10⁻⁶ K⁻¹@-62 to 23°C

Glass transition temperature

359.85 - 409.85 °C

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Heat deflection temperature, 1.80 MPa

359.85 °C

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ASTM D648

Specific heat capacity

23.0 °C

1130 J/(kg·K)

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Thermal conductivity

40.0 °C

0.35 W/(m·K)

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Electrical

PropertyTemperatureValueComment

Dielectric constant, 100Hz

23.0 °C

3.62 [-]

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ASTM D150

Dielectric constant, 1MHz

23.0 °C

3.55 [-]

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ASTM D150

Dielectric strength

23.0 °C

0.02 kV/mm

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ASTM D149, short time, 0.002m thick

Dissipation factor

23.0 °C

3.6E-3 [-]

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ASTM D150, 10000 Hz

Dissipation factor, 100Hz

23.0 °C

1.8E-3 [-]

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ASTM D150

Dissipation factor, 1MHz

23.0 °C

3.4E-3 [-]

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ASTM D150

Electrical resistivity

23.0 °C

1.00E+14 - 1.00E+15 Ω·m

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ASTM D257

Surface resistivity

23.0 °C

1.00E+15 - 1.00E+16 Ω/sq

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ASTM D257

Technological properties

Property
Application areas

Vespel molded parts are used in automobiles, large on-and-off-road vehicles, farm equipment, business machines, electronic equipment, etc.: rotary seal rings, thrust washers and discs, bushings, flanges bearings, printer platen bars, plungers, printer wireguides, stripper fingers, spline couplings, wear strips, locknut inserts, valve seats, check valve balls, thermal and electrical insulators.