Poly(butylene terephthalate) Reinforced with 50% Glass Fibers (PBT+GF50)

Alternative and trade names
Ultradur®, Bergadur™, Celanex®, TECACOMP®, Arnite®, Raditer®, VYPET™
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Polybutylene terephthalate with 50% glass fiber reinforced. Thermoplastic polyester (PBT) is a semicrystalline structure. The key features are:

  • Very hard, rigid and strong
  • Good creep resistance
  • High heat-distortion temperature, especially for glass fiber-reinforced grades
  • Service temperature to 140°C
  • Very good low-friction and wear-resistant properties
  • High dimensional stability (low thermal expansion coefficient, low water absorption)
  • Good electrical properties
  • Good chemical resistance
  • No environmental stress cracking
  • Good weathering resistance
  • Rapid crystallization and fast cycle time
  • Paintable
  • Flame-retardant grades available (UL 94 V-0, in some cases 5VA)
  • 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.

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    1.7 - 1.73 g/cm³

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    Elastic modulus

    14.0 - 18.0 GPa

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    1.5 - 2.0 %

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    Impact strength, Charpy notched

    10.0 - 15.0 kJ/m²

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    Impact strength, Charpy unnotched

    50 kJ/m²

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    70 kJ/m²

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    Tensile strength

    140.0 - 170.0 MPa

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    at 1.5-2% strain



    Coefficient of thermal expansion

    2e-05 - 8e-05 1/K

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    Melting point

    220.0 - 225.0 °C

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    Specific heat capacity

    1400 J/(kg·K)

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    Thermal conductivity

    0.27 W/(m·K)

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    UL 94 HB



    Dielectric constant

    3.8 [-]

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    4.5 [-]

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    Electrical resistivity

    100000000000000 Ω·m

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    Technological properties

    Application areas

    Automotive exterior, door handles, mirror housings, wiper arms


    50% Glass Fiber


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    Processing methods

    Injection molding