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PPSU vs. PEI

Both PPSU and PEI are thermoplastics. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 140
140 to 180
Elastic (Young's, Tensile) Modulus, GPa 3.6
3.4 to 5.6
Elongation at Break, % 26
3.0 to 34
Flexural Modulus, GPa 4.7
3.4 to 5.9
Flexural Strength, MPa 130
140 to 210
Impact Strength: Notched Izod, J/m 80
55 to 110
Rockwell M Hardness 84
110 to 130
Tensile Strength: Ultimate (UTS), MPa 95
110 to 160

Thermal Properties

Glass Transition Temperature, °C 220
210
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 210
200 to 210
Maximum Temperature: Autoignition, °C 580
530
Maximum Temperature: Decomposition, °C 560
530
Maximum Temperature: Mechanical, °C 160
170
Specific Heat Capacity, J/kg-K 970
1050 to 1220
Thermal Conductivity, W/m-K 0.24
0.18 to 0.23
Thermal Expansion, µm/m-K 45
20 to 53

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.4
3.2 to 3.7
Dielectric Strength (Breakdown Potential), kV/mm 16
30 to 33
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
14 to 15

Otherwise Unclassified Properties

Density, g/cm3 1.4
1.3 to 1.5
Limiting Oxygen Index (LOI), % 38
47 to 50
Water Absorption After 24 Hours, % 0.44
0.17 to 0.25

Common Calculations

Stiffness to Weight: Axial, points 1.4
1.5 to 2.1
Stiffness to Weight: Bending, points 36
39
Strength to Weight: Axial, points 19
24 to 30
Strength to Weight: Bending, points 33
40 to 44
Thermal Diffusivity, mm2/s 0.17
0.11 to 0.14
Thermal Shock Resistance, points 42
44 to 100