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SIGRAFINE® isostatic graphites R6650

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Description

SIGRAFINE® Isostatic graphite is an ultra-fine grain graphite used for electronic 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

    General

    Ash content

    cash

    5E-4 - 3E-3 % at 20 °C

    depending on the code, it can also be less than 5 ppm

    Bulk density

    ρbulk

    1.84 g/cm³ at 20 °C

    Grain size

    dgrain

    7 μm

    Permeability coefficient

    cperm

    0.02 cm²/s at 20 °C

    Porosity

    Vvoid

    10 %

    open porosity

    Mechanical

    Compressive strength

    Rmc

    150 MPa at 20 °C

    Show Graphite materials with Compressive strength of 150 MPa at 20 °C

    Elastic modulus

    E

    12.5 GPa at 20 °C

    Show Graphite materials with Elastic modulus of 12.5 GPa at 20 °C

    Dynamic Modulus

    Flexural strength

    σbend

    65 MPa at 20 °C

    Show Graphite materials with Flexural strength of 65 MPa at 20 °C

    Hardness, Rockwell

    HR

    95 [-] at 20 °C

    Show Graphite materials with Hardness, Rockwell of 95 [-] at 20 °C

    5/100

    Thermal

    Coefficient of thermal expansion

    α

    4.1E-6 1/K at 20 °C

    @20-200°C

    Thermal conductivity

    λ

    100 W/(m·K) at 20 °C

    Electrical

    Electrical resistivity

    ρel

    1.4E-5 Ω·m at 20 °C

    Chemical properties

    Element

    Weight %

    Comment

    C

    -

    Balance

    Si

    1E-4 - 2E-4 %

    depending on the code, it can also be less

    B

    2E-6 - 1E-5 %

    depending on the code, it can also be less

    Fe

    2E-6 - 5E-5 %

    depending on the code

    P

    2E-6 - 1E-5 %

    depending on the code, it can also be less

    More

    Technological properties

    Processing methods

    Isostatically pressed

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    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.