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Graphite & Carbon

Why graphite is the ideal material

Conductivity

Graphite is a good conductor of both electricity and heat. This is due to its molecular structure, which allows electrons to move freely through it.

Its unusual stacked ‘plate-upon-plate’ structure means graphite is the only common non-metal that conducts electricity so effectively.

High melting point

Graphite’s molecular structure also means it can’t be broken down easily.

Rather than loosen one sheet of molecules from another, you have to break the covalent bonding (the particular way in which atoms are bonded together) throughout the whole structure in order to melt the material.

Substances like graphite which have these giant structures have very high melting points. Graphite’s melting point is more than 3,600°C.

Stability at high temperatures

Graphite is a refractory mineral, which means it is stable over a wide range of temperatures and able to retain its strength and form at very high temperatures.

Resistance to thermal shock

Thermal shock is when a sudden change in temperature—hot to cold, cold to hot—puts tension on a material, causing it to break. It is most common in:

  • brittle materials such as ceramics
  • materials which aren’t very good at conducting heat

Although graphite is naturally very brittle—which prevents it from being used as a structural material on its own—it can be made more resistant to thermal shock through careful choice of raw materials and specific processing methods.

Graphite made for manufacturing and engineering will have been processed in a way that balances properties such as:

  • thermal expansion
  • conductivity
  • strength

Resistance to corrosion/chemicals

Graphite is chemically inert—in other words, it won’t undergo any reaction as a result of coming into contact with other chemicals.

This means it won’t rust, corrode or wear away due to acidic chemicals or oxidation, for example.

Self-lubricating/low friction

Graphite is made up of layers of carbon atoms. Because these layers are weakly bonded together, they slide over each other easily. This is what makes graphite a soft and slippery material and gives it its self-lubricating properties.

Non-stick

Used as a non-stick coating, graphite enables dry lubrication where traditional wet lubrication isn’t possible. Graphite reduces friction and noise from machinery and keeps equipment running without issue for longer periods of time.

Low porosity

Synthetic graphite can be produced with varying degrees of porosity—in other words, making the graphite porous so liquid, air or gas can pass through its layers.

Although there are certain applications for which high levels of porosity are useful, in most cases graphite with low porosity is required.

Graphite Blocks

Graphite Blocks
Olmec supply a range of grades and sizes of graphites and carbons in block form.
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Graphite Rods

Graphite Rods
Olmec supply a range of grades and sizes of graphites and carbons in rod form.
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Carbon Bricks

Carbon Bricks
Olmec Advanced Materials produce an exceptional quality Carbon Brick.
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Carbon Brushes

Carbon Brushes
Carbon brushes are used to transfer electrical current from a moving (usually rotating) to a stationary point within an electric circuit.
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Carbon & Graphite Felt

Carbon & Graphite Felt
Olmec Advanced Materials offer the finest quality carbon and graphite felts in a variety of widths and thicknesses to meet a wide range of applications. Learn More

Graphite & Carbon Technical Data

Graphite & Carbon Technical Data
All our technical data sheets download in PDF Format.
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