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PEI vs. PETG

Both PEI and PETG are thermoplastics. There are 21 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is PEI and the bottom bar is PETG.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 140 to 180
55
Elastic (Young's, Tensile) Modulus, GPa 3.4 to 5.6
2.2
Flexural Modulus, GPa 3.4 to 5.9
2.1
Flexural Strength, MPa 140 to 210
77
Impact Strength: Notched Izod, J/m 55 to 110
77
Tensile Strength: Ultimate (UTS), MPa 110 to 160
53

Thermal Properties

Glass Transition Temperature, °C 210
81
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 200 to 210
69
Specific Heat Capacity, J/kg-K 1050 to 1220
1200
Thermal Conductivity, W/m-K 0.18 to 0.23
0.29
Thermal Expansion, µm/m-K 20 to 53
68

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.2 to 3.7
2.4
Dielectric Strength (Breakdown Potential), kV/mm 30 to 33
16

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
1.3
Water Absorption After 24 Hours, % 0.17 to 0.25
0.2

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 2.1
1.0
Stiffness to Weight: Bending, points 39
34
Strength to Weight: Axial, points 24 to 30
12
Strength to Weight: Bending, points 40 to 44
25
Thermal Diffusivity, mm2/s 0.11 to 0.14
0.19
Thermal Shock Resistance, points 44 to 100
25