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:
Bulk density
ρbulk1.77 g/cm³ at 23 °C
Grain size
dgrain10 μm
Permeability coefficient
cperm0.25 cm²/s at 23 °C
Porosity
Vvoid14 %
open porosity
Ash content
cash5E-4 - 3E-3 % at 23 °C
depending on the code, it can also be less than 5 ppm
Coefficient of thermal expansion
α4.2E-6 1/K at 23 °C
@20-200°C
Thermal conductivity
λ95 W/(m·K) at 20 °C
Electrical resistivity
ρel1.4E-5 Ω·m at 23 °C
Element
Weight %
Comment
-
Balance
1E-4 - 2E-4 %
depending on the code, it can also be less
2E-6 - 1E-5 %
depending on the code, it can also be less
2E-6 - 5E-5 %
depending on the code
2E-6 - 1E-5 %
depending on the code, it can also be less
Processing methods
Isostatically pressed
This material data has been provided by SGL Carbon.