Poly(butylene terephthalate) Reinforced with 20% Glass Fibers (PBT+GF20)

Alternative and trade names
Ultradur®, Crastin®, Celanex®, Pocan®, TECACOMP®, Arnite®, Raditer®, VYPET™
Want to keep this datasheet? Save it now in your required format


Reinforced Poly(butylene terephthalate) with 20% glass fiber. Depending on the grade, the key features are:

  • Improved laser-transparency, NIR-laser transparent coloring (black)
  • Flame retardant / halogen free flame retardant
  • Lubricated
  • Stiffness and toughness
  • Heat resistance
  • Friction and wear resistance
  • Excellent surface finishes and good colourability
  • 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.

    Ashby charts

    See where falls on the material property chart for against in your materials selection and design process. Our Ashby charts are interactive with more technical data upon clicking. Sign up to get access to this premium feature for free.





    1.4 - 1.54 g/cm³

    Show Material materials with Density of 1.4 - 1.54 g/cm³



    Elastic modulus

    6.0 - 10.0 GPa

    Show Material materials with Elastic modulus of 6.0 - 10.0 GPa


    2.5 - 4.5 %

    Show Material materials with Elongation of 2.5 - 4.5 %

    Impact strength, Charpy notched

    5.0 - 20.0 kJ/m²

    Show Material materials with Impact strength, Charpy notched of 5.0 - 20.0 kJ/m²

    Impact strength, Charpy unnotched

    30 kJ/m²

    Show Material materials with Impact strength, Charpy unnotched of 30 kJ/m²

    70 kJ/m²

    Show Material materials with Impact strength, Charpy unnotched of 70 kJ/m²

    Tensile strength

    90.0 - 140.0 MPa

    Show Material materials with Tensile strength of 90.0 - 140.0 MPa

    at 2.5-4.5% strain



    Coefficient of thermal expansion

    2e-05 - 0.00012 1/K

    Show Material materials with Coefficient of thermal expansion of 2e-05 - 0.00012 1/K

    Melting point

    220.0 - 225.0 °C

    Show Material materials with Melting point of 220.0 - 225.0 °C

    Specific heat capacity

    1500 J/(kg·K)

    Show Material materials with Specific heat capacity of 1500 J/(kg·K)

    Thermal conductivity

    0.27 W/(m·K)

    Show Material materials with Thermal conductivity of 0.27 W/(m·K)


    UL 94 HB



    Dielectric constant

    3.2 [-]

    Show Material materials with Dielectric constant of 3.2 [-]

    4.2 [-]

    Show Material materials with Dielectric constant of 4.2 [-]

    Electrical resistivity

    10000000000000.0 - 100000000000000.0 Ω·m

    Show Material materials with Electrical resistivity of 10000000000000.0 - 100000000000000.0 Ω·m





    Technological properties

    Application areas

    Small-motor housings, headlamp frames, windshield wiper arms, toaster casings, sunroof frames, exterior mirrors


    20% Glass Fiber


    You are viewing a generic polymer page, for more information please contact the suppliers or Matmatch, or use our Search under the following link to find more specific grades and formulations based on your application:

    Polymer Advanced Search

    Processing methods

    Injection molding, extrusion