Graphite, like diamond, consists of pure carbon arranged in a hexagonal crystal system. One differentiates between natural and synthetic graphite depending on the extraction or production method. Graphite exhibits a unique combination of material properties due to the special crystalline composition of the layer structure.
Our various categories of graphite are described in more detail below:
- Natural graphite
Natural graphite is found in deposits around the world and mainly extracted by surface mining. China is the main mining region, with additional deposits in Africa, South America and Europe. Subsequent further processing produces a variety of grades with different levels of purity and particle sizes. Natural graphite is classified as macrocrystalline and microcrystalline (“amorphous”) depending on the characteristics of the crystal structure. We work with our parters to continuously research and develop new application possibilities.
- Expandable graphite
Special processing methods are used to produce what is known as exfoliated graphite or expandable graphite from natural mineral graphite. It has the unique property of abruptly expanding by many times its volume when it is exposed to heat.
At Georg H. Luh, we have extensive know-how in this product field and offer the right products for a wide variety of applications with numerous different grades and variants.
Benefits of expandable graphite as halogenfree flame retardant:
- Forms an intumescence layer
- Stops or slows the spread of fire
- Counteracts the spread of toxic gases
- Highly efficient with low input quantity
- Easy to apply as flakes
- Synthetic graphite
Synthetic graphite is produced from petroleum coke or other amorphous carbon compounds through extended thermal treatment at approximately 3000 °C in the absence of oxygen. Through sifting and grinding processes, synthetic graphite with a particle size of 2 µm to 20 mm and a carbon content of 98% or higher can be obtained.
Fields of application
- Moulded graphite parts for glass and foundry industry
- Powdered synthetic graphite
Would you like further information about our powdered synthetic graphite products, or additional fields of application? We are happy to advise you in person. Send us an e-mail or give us a call!
- Expandable graphite