EDM / Spark Erosion

Coidan Graphite Products represent Ibiden Graphite BV for their range of high end isostatic graphite products, Ibiden grades of graphite can easily be identified by their outstanding high temperature resistance, high purity and low gas-emissions qualities. IBIDEN, in response to a wide variety of industrial needs, is in the business of supplying a whole range of materials that put these superior qualities to work, from general use lubricants to the most technologically advanced products.

Unique Graphite Features

  • Thermally stable
    Graphite can be used at 3000°C in inert atmosphere, has high thermal shock resistance and increased strength at elevated temperatures.
  • Chemically stable
    Carbon and Graphite have good corrosion resistance, it can be used in most acid/alkaline environments.
  • Electrical and Thermal Conductor
    Graphite has good electrical and thermal conductivity.
  • Low expansion coefficient:
    Thermal expansion coefficient is low, dimensional stability at high temperatures is high and strength is not significantly reduced up to 2000°C.
  • Light weight:
    The true density of single crystal graphite is 2.26, but the apparent density is around 1.60 – 1.90 since regular graphite is around 15-30% porous
  • Lubricating ability:
    Due to soft molecular structure, lubricating property is great, enabling greaseless use at high and low temperatures. 

Ibiden Graphite Grades

Medium Grades

GRAPHITE GRADE EX50

EDM Roughing electrode
Properties Units Values
Apparent Density g/cc 1.75
Typical Grain Size mm 0.015
Hardness Shore 55
Breaking Strength Flexural

MPa
Kg/cm²

63.7
650
Specific Resistance Ωm x 10-6 12.5
Surface Finish VDI 36 ~ 27
Maximum block size mm 300 x 600 x 1200

 

GRAPHITE GRADE ED-3

EDM Roughing electrode
Properties Units Values
Apparent Density g/cc 1.80
Typical Grain Size mm 0.010
Hardness Shore 65
Breaking Strength Flexural MPa
Kg/cm²
58.8
600
Specific Resistance Ωm x 10-6 14
Surface Finish VDI
Ra
33 ~ 27
4.5 ~ 2.24
 Maximum block size  mm  250 x 460 x 1020

High Grades

GRAPHITE GRADE EX60

EDM Graphite Electrodes
Properties Units Values
Apparent Density g/cc 1.80
Typical Grain Size mm 0.010
Hardness Shore 62
Breaking Strength Flexural MPa
Kg/cm²
815
13
Specific Resistance Ωm x 10-6 13
Surface Finish VDI
Ra
30 ~ 24
3.15 ~ 1.60
Maximum block size mm 310 x 620 x 1220

 

GRAPHITE GRADE EX70

EDM Graphite Electrodes
Properties Units Values
Apparent Density g/cc 1.85
Typical Grain Size mm 0.006
Hardness Shore 70
Breaking Strength Flexural MPa
Kg/cm²
68.8
700
Specific Resistance Ωm x 10-6 15
Surface Finish VDI
Ra
27 ~ 21
2.24 ~ 1.12
Maximum block size mm 235 x 440 x 1000

Premium Grades

GRAPHITE GRADE EDX-6

Fine machined EDM electrodes
Properties Units Values
Apparent Density g/cc 1.88
Typical Grain Size mm 0.005
Hardness Shore 65
Breaking Strength Flexural MPa
Kg/cm²
865
15
Specific Resistance Ωm x 10-6 15
Surface Finish VDI
Ra
24 ~ 18
1.60 ~ 0.80
Maximum block size mm 111 x 305 x 610

 

GRAPHITE GRADE EDX-7

Fine machined EDM electrodes
Properties Units Values
Apparent Density g/cc 1.82
Typical Grain Size mm 0.003
Hardness Shore 68
Breaking Strength Flexural MPa
Kg/cm²
95.0
970
Specific Resistance Ωm x 10-6 17
Surface Finish VDI
Ra
21 ~ 15
1.12 ~ 0.56
Maximum block size mm 100 x 300 x 400

Ibiden Carbon and graphite Applications

Ibiden Graphite is deployed in many industrial areas due to various application ans special features.

  • Graphite parts in silicon semiconductor fields.
  • Graphite parts in compound semiconductor fields.
  • Graphite electrode for electric discharge machining
  • Energy related parts
  • Next generation energy equipment parts.

Ibiden

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Coidan Graphite Products Ltd, Kirk Hammerton, York. YO26 8DQ | 01423 330492 | | www.coidan.com