Before selecting graphite electrode, you need to know the following properties:

Specific Resistance / Electrical Resistivity: 
It is the resistance to the passage of electric current. A low resistance value allows a higher current intensity without the electrodes overheating.

Apparent Density:
It is the weight per unit volume. A higher bulk density usually reflects better mechanical properties.

Resistance to Tension:
It is the force that is required to produce a break by tension. A high value reduces the number of nipple breaks.

Flexural Strength: 
The force required to produce a flexural break (also called a break module). A high value reduces the number of electrode breaks.

Grade: 

Depends on the quality of the raw material (coke) used in the manufacture of graphite electrodes. The classification may vary among the world’s producers.

Young’s Modulus: 

It is a measure of resistance to the change of length before a tension or compression force. This modulus of elasticity is expressed as the relation between force (force per unit area) and the resulting deformation (change in length per unit length). A low value is usually associated with a good resistance to thermal shock.

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