SIGRAFINE® Isostatic graphites R4810

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Description

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
  • 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.

    Ashby charts

    Properties

    General

    PropertyTemperatureValueComment

    Bulk density

    23.0 °C

    1.82 g/cm³

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    Grain size

    20 μm

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    Permeability coefficient

    20.0 °C

    0.3 cm²/s

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    Porosity

    11 %

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    open porosity

    Mechanical

    PropertyTemperatureValueComment

    Compressive strength

    23.0 °C

    100 MPa

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    Elastic modulus

    23.0 °C

    10.5 GPa

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    Dynamic Modulus

    Flexural strength

    23.0 °C

    45 MPa

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    Hardness, Rockwell

    23.0 °C

    95 [-]

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    10/100

    Thermal

    PropertyTemperatureValueComment

    Ash content

    23.0 °C

    5E-3 %

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    Coefficient of thermal expansion

    23.0 °C

    4.1E-6 1/K

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    @20-200°C

    Thermal conductivity

    20.0 °C

    140 W/(m·K)

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    Technological properties

    Property
    Application areas

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

    Processing methods

    Isostatically pressed