Polybutylene terephthalate Reinforced with 30% Glass Fibre (PBT+GF30)

Alternative and trade names
Ultradur®, Crastin®, Celanex®, Pocan®
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Reinforced Polybutylene terephthalate with 30% glass fiber.

  • Very good stiffness and toughness
  • Wear resistance
  • Excellent surface finishes and good colourability.
  • It has an excellent electrical insulation characteristics and high arc-resistant grades are available.
  • Many flame retardant grades have UL recognition (class V-0).
  • It typically has high chemical and heat ageing resistance.
  • The good melt stability normally enables the recycling of properly handled production waste.
  • 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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    23.0 °C

    1.47 - 1.56 g/cm³

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    Elastic modulus

    23.0 °C

    8 - 11 GPa

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    23.0 °C

    1.8 - 3.5 %

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    Impact strength, Charpy notched

    23.0 °C

    5 - 12 kJ/m²

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    Impact strength, Charpy unnotched

    23.0 °C

    40 - 70 kJ/m²

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    Tensile strength

    23.0 °C

    100 - 150 MPa

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    at 1.8-3.5% strain



    Coefficient of thermal expansion

    23.0 °C

    2E-5 - 1E-4 1/K

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    Max service temperature, long

    150 °C

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    Max service temperature, short

    220 °C

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    Melting point

    220 - 225 °C

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    Specific heat capacity

    23.0 °C

    1500 J/(kg·K)

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    Thermal conductivity

    23.0 °C

    0.27 - 0.28 W/(m·K)

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    UL 94 HB



    Dielectric constant

    23.0 °C

    3.5 - 4.5 [-]

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    Electrical resistivity

    23.0 °C

    1.00E+13 Ω·m

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    Technological properties

    Application areas

    windshield wiper arms, printed circuit boards, airbag ignition sensors


    30% Glass Fiber

    Processing methods

    Injection molding, extrusion