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PES vs. PBI

PES belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is PES and the bottom bar is PBI.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.6
5.9
Elongation at Break, % 65
3.0
Flexural Modulus, GPa 2.6
6.5
Flexural Strength, MPa 130
220
Impact Strength: Notched Izod, J/m 91
27
Tensile Strength: Ultimate (UTS), MPa 87
160

Thermal Properties

Glass Transition Temperature, °C 220
410
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 200
430
Maximum Temperature: Decomposition, °C 540
590
Maximum Temperature: Mechanical, °C 200
340
Specific Heat Capacity, J/kg-K 1100
930
Thermal Conductivity, W/m-K 0.18
0.41
Thermal Expansion, µm/m-K 53
23

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.5
3.4
Dielectric Constant (Relative Permittivity) At 1 MHz 3.5
3.8
Dielectric Strength (Breakdown Potential), kV/mm 16
23
Electrical Resistivity Order of Magnitude, 10x Ω-m 15
13

Otherwise Unclassified Properties

Density, g/cm3 1.4
1.3
Limiting Oxygen Index (LOI), % 36
58
Water Absorption After 24 Hours, % 0.34
0.4

Common Calculations

Stiffness to Weight: Axial, points 1.1
2.5
Stiffness to Weight: Bending, points 33
46
Strength to Weight: Axial, points 18
34
Strength to Weight: Bending, points 32
50
Thermal Diffusivity, mm2/s 0.12
0.34
Thermal Shock Resistance, points 45
84