Isostatic graphite is a type of graphite with an ultra-fine grain that is used for specific purposes where the mechanical properties found in other fine-grained graphites are insufficient. Among it's other desirable properties, isostatic graphite is corrosion resistant.
Isostatic graphite is also known as isostatically molded graphite, which is a reference to the means by which the raw material mixture is compressed into rectangular or round shaped blocks in a system called cold isostatic pressing (CIP). Cold isostatic pressing is a material processing method where a change in pressure of an enclosed incompressible fluid is conveyed unchanged to every part of the fluid including to the surface of its container.
Compared to other technologies like extrusion and vibration molding, CIP technology produces artificial graphite of the most isotropic form. Isostatic graphite also generally tends to have the smallest grain sizes (on the order of 20 microns) that can be found in artificial graphites.
Isostatic graphite production started in the 1960s at the SGL Carbon plant in Bonn, Germany as one of the very first in the world to manufacture materials that had a constant quality and were also suitable for applications in the nuclear and metallurgical industries.
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