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Expanded natural graphite
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The Material
The unique properties of natural graphite are captured in expanded graphite for use in a variety of applications. During the expansion process, the graphite retains its excellent inherent electrical and thermal conductivity.
The Properties
- flexible and soft
- chemically and thermally resistant
- high impermeability
- high thermal conductivity
The Manufacturing Process
Expanded graphite is manufactured from natural graphite flakes with well-ordered high-crystalline structures. When these flakes are mixed with an intercalation agent, a graphite salt forms which is then subjected to a high temperature shock. During the expansion, the graphite flakes increase in volume by a factor of 200 to 400. The loose “worms” of expanded graphite are compressed without any binding or fillers into products such as sheets or foils.
Expansion process:
In the left photo we can see individual flakes stacked on top of each other .
A single flake can be expanded by the process described above in to expanded
graphite increasing it's thickness by 200 to 400 times ,
On the right hand you see the a opened flake which looks a bit like concertina door .
And yes heat is a very important factor in the graphite creation !
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