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RPU vs. PBI

Both RPU and PBI 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 RPU and the bottom bar is PBI.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 1.2
1.3

Common Calculations

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