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SIGRAFINE® Isostatic graphites R4550

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SIGRAFINE® Isostatic graphite is an ultra-fine grain graphite used for applications where the mechanical properties of other fine grain graphites are inadequate. The term "Isostatic Graphite" stands for isostatically molded graphite. This means that the raw material mixture is compressed into rectangular or round blocks in a so called Cold-Isostatic-Press (CIP). Compared to other technologies such as extrusion or vibration molding, this technology can produce the most isotropic form of artificial graphite. In addition, isostatic graphite generally tends to have the smallest grain sizes of all artificial graphites. Typical properties of the material:

  • Extremely high thermal and chemical resistance
  • Excellent thermal shock resistance
  • High electrical conductivity
  • High thermal conductivity
  • Increasing strength with rising temperature
  • Easy to machine
  • Can be produced with very high purity < 5 ppm
  • Properties


    Ash content


    2E-3 % at 20 °C

    Bulk density


    1.83 g/cm³ at 20 °C

    Grain size


    10 μm

    Permeability coefficient


    0.06 cm²/s at 20 °C



    10 %

    open porosity


    Compressive strength


    130 MPa at 20 °C

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    Elastic modulus


    11.5 GPa at 20 °C

    Show Graphite materials with Elastic modulus of 11.5 GPa at 20 °C

    Dynamic Modulus

    Flexural strength


    60 MPa at 20 °C

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    Hardness, Rockwell


    90 [-] at 20 °C

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    Coefficient of thermal expansion


    4.2E-6 1/K at 20 °C


    Thermal conductivity


    110 W/(m·K) at 20 °C

    Technological properties

    Application areas

    Metallurgical applications e.g. continuous casting, crucibles, sintering molds, etc.

    Processing methods

    Isostatically pressed

    Do you need more data regarding this material?

    This material data has been provided by SGL Carbon.

    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.