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PEI vs. PS

Both PEI and PS are thermoplastics. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.4 to 5.6
1.9 to 2.9
Elongation at Break, % 3.0 to 34
1.8 to 40
Flexural Strength, MPa 140 to 210
62 to 80
Impact Strength: Notched Izod, J/m 55 to 110
19 to 45
Tensile Strength: Ultimate (UTS), MPa 110 to 160
32 to 44

Thermal Properties

Glass Transition Temperature, °C 210
100
Maximum Temperature: Autoignition, °C 530
360 to 420
Maximum Temperature: Decomposition, °C 530
320 to 330
Maximum Temperature: Mechanical, °C 170
70
Specific Heat Capacity, J/kg-K 1050 to 1220
1250 to 1400
Thermal Conductivity, W/m-K 0.18 to 0.23
0.14 to 0.22
Thermal Expansion, µm/m-K 20 to 53
80 to 98

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 30 to 33
18 to 20
Electrical Resistivity Order of Magnitude, 10x Ω-m 14 to 15
14 to 15

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
1.0
Limiting Oxygen Index (LOI), % 47 to 50
18
Water Absorption After 24 Hours, % 0.17 to 0.25
0.040 to 0.080

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 2.1
1.0 to 1.5
Stiffness to Weight: Bending, points 39
40 to 45
Strength to Weight: Axial, points 24 to 30
8.5 to 12
Strength to Weight: Bending, points 40 to 44
22 to 26
Thermal Diffusivity, mm2/s 0.11 to 0.14
0.11 to 0.15
Thermal Shock Resistance, points 44 to 100
11 to 15