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PBI vs. RPU

Both PBI and RPU are thermoset plastics. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 5.9
2.2
Elongation at Break, % 3.0
90
Flexural Modulus, GPa 6.5
2.0
Flexural Strength, MPa 220
83
Tensile Strength: Ultimate (UTS), MPa 160
60

Thermal Properties

Maximum Temperature: Decomposition, °C 590
270
Specific Heat Capacity, J/kg-K 930
1750
Thermal Conductivity, W/m-K 0.41
0.19
Thermal Expansion, µm/m-K 23
63

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 23
19
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
13

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.2

Common Calculations

Stiffness to Weight: Axial, points 2.5
1.0
Stiffness to Weight: Bending, points 46
36
Strength to Weight: Axial, points 34
14
Strength to Weight: Bending, points 50
28
Thermal Diffusivity, mm2/s 0.34
0.090
Thermal Shock Resistance, points 84
31