Polybenzimidazole (PBI)

Alternative and trade names


Its key features include:

  • Highest Compressive Strength of any unfilled resin
  • Excellent Tensile and Flexural Strength
  • Lowest coefficient of friction (COF) and highest Wear Resistance
  • Excellent Hardness
  • High Tg (467°C) and Heat Deflection Temperature (HDT)
  • Very good Plasma Resistance
  • It offers the highest Heat Resistance and Mechanical properties retention up to 400°C
  • Low Outgassing in vacuum (dry material)
  • Properties


    Density ρ

    1.3 g/cm³ at 20 °C


    Elastic modulus E

    5.8 - 5.9 GPa at 20 °C

    Elongation A

    3 % at 20 °C

    Impact strength, Charpy notched Ivnot

    3.5 kJ/m² at 20 °C

    Max allowed stress σmax

    130 - 140 MPa at 20 °C

    at 3% strain


    Coefficient of thermal expansion α

    2.3E-5 - 3.3E-5 1/K at 20 °C


    UL 94 V0

    Max service temperature, long Tmaxlong

    200 °C

    Max service temperature, short Tmaxshort

    300 °C

    Specific heat capacity cp

    1300 J/(kg·K) at 20 °C

    Thermal conductivity λ

    0.41 W/(m·K) at 20 °C


    Dielectric constant εr

    3.2 - 3.5 [-] at 20 °C

    Electrical resistivity ρel

    8.00E+12 Ω·m at 20 °C




    Technological properties

    Application areas

    Heat resistant textile fibres, firefighter uniforms, coatings for surface protection

    Processing methods

    Wet spinning, injection molding, extrusion, compression molding

    This material data has been provided by M-Base.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.