Graphite electrode properties you need to know
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.
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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.
