David snc. Minerals

DAVID snc
Viale Agnini n.76 int.32
"Direzionale Favorita"
41037 Mirandola MO
Tel. +39.0535.664372
Fax +39.0535.607819
Email: info@davidsnc.it

Graphite

Like diamond, graphite consists of  pure carbon. Its special crystal structure gives rise to the graphite’s unique material properties:
- Excellent electrical and thermal conductivity
- Outstanding lubricity
- High thermal shock resistance
- High temperature resistant up to >3000 °C in O2-free atmosphere
- Resistant to acids and oxidising agents
- Formation of intercalated compounds

Chemical Composition: C
Density: 2,1 - 2,3 g/cm³
Mohs hardness: 1 - 2
Melting point: 3.700 °C

Natural graphite

Natural graphite is mined in many regions around the world e.g. China, Africa, South America, Canada, Europe. 
Processing is carried out through mechanical (flotation), chemical and thermal cleaning processes, screening and refining. 

According to the characteristic of the crystal structure one can differentiate between macrocrystalline and microcrystalline (“amorphous“) natural graphite.

Our product portfolio covers the following specification range:

Macrocrystalline natural graphite:
Carbon content: 80 - 99,9%
Particle size: 3 µm - 800 µm

Microcrystalline ("amorphous") natural graphite:
Carbon content: 60 - 90%
Particle size: 2 µm - 5 mm


Synthetic graphite

Through  long  term  thermal  treatment  in  the  absence  of  oxygen  at  around 3000°C, synthetic graphite is produced from petroleum coke or other amorphous carbon compounds. 

In addition to graphite electrodes for the metalworking industry, the raw material for graphite moulded parts and powdered synthetic graphite is also produced in this way. Through screening and refining processes synthetic graphite can be produced within the following specification areas:

Carbon concentration: 98 - 99,9 %
Particle size: 2 µm to 20 mm


Expandable / exfoliated graphite

Production:
For the production of expandable graphite, sulphur or nitrogen compounds are incorporated into the crystal layers of large natural graphite flakes. On heating, the graphite layers suddenly expand. The graphite flakes increase their volume several hundredfold in comparison to their original volume.

Specification range:
Carbon concentration: 85 - 99,5 %
Particle size: 50 µm - 800 µm
Expansion rate: 120 - 350 cm³/g
Starting temperature: 160 - 300 °C