# PBI vs. DAP

Both PBI and DAP are thermoset plastics. There are 21 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 PBI and the bottom bar is DAP.

Metric UnitsUS Customary Units

## Mechanical Properties

Compressive (Crushing) Strength, MPa | 350 | |

150 |

Elastic (Young's, Tensile) Modulus, GPa | 5.9 | |

13 |

Elongation at Break, % | 3.0 | |

31 |

Flexural Strength, MPa | 220 | |

62 |

Impact Strength: Notched Izod, J/m | 27 | |

14 |

Tensile Strength: Ultimate (UTS), MPa | 160 | |

28 |

## Thermal Properties

Glass Transition Temperature, °C | 410 | |

150 |

Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 430 | |

160 |

Specific Heat Capacity, J/kg-K | 930 | |

1450 |

Thermal Conductivity, W/m-K | 0.41 | |

0.6 |

Thermal Expansion, µm/m-K | 23 | |

25 |

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz | 3.4 | |

5.2 |

Dielectric Strength (Breakdown Potential), kV/mm | 23 | |

40 |

Electrical Resistivity Order of Magnitude, 10^{x} Ω-m |
13 | |

13 |

## Otherwise Unclassified Properties

Density, g/cm^{3} |
1.3 | |

1.7 |

## Common Calculations

Stiffness to Weight: Axial, points | 2.5 | |

4.1 |

Stiffness to Weight: Bending, points | 46 | |

46 |

Strength to Weight: Axial, points | 34 | |

4.5 |

Strength to Weight: Bending, points | 50 | |

12 |

Thermal Diffusivity, mm^{2}/s |
0.34 | |

0.24 |

Thermal Shock Resistance, points | 84 | |

6.3 |