# 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, 10^{x} Ω-m |
13 | |

13 |

## Otherwise Unclassified Properties

Density, g/cm^{3} |
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, mm^{2}/s |
0.34 | |

0.090 |

Thermal Shock Resistance, points | 84 | |

31 |