What are EDM electrodes?

These are electrodes that are used in electrical discharge machining, also known as spark eroding or spark machining. The process involves using a controlled spark to erode metal.

We work with Ibiden Graphite BV to supply their range of high end isostatic graphite products. An electrical and thermal conductor, with outstanding temperature and corrosion resistance, Ibiden’s graphite makes for the perfect EDM electrode material.

Graphite grades for EDM electrodes

We have access to a range of graphite grades. Take a look at the tables below to find the one that suits your requirements.

Medium grades

GRAPHITE GRADE EX50

PropertiesUnitsValues
Apparent Densityg/cc1.75
Typical Grain Sizemm0.015
HardnessShore55
Breaking Strength FlexuralMPa
Kg/cm²
63.7
650
Specific ResistanceΩm x 10-612.5
Surface FinishVDI36 ~ 27
Maximum block sizemm300 x 600 x 1200

GRAPHITE GRADE ED-3

PropertiesUnitsValues
Apparent Densityg/cc1.80
Typical Grain Sizemm0.010
HardnessShore65
Breaking Strength FlexuralMPa
Kg/cm²
58.8
600
Specific ResistanceΩm x 10-614
Surface FinishVDI
Ra
33 ~ 27
4.5 ~ 2.24
Maximum block sizemm250 x 460 x 1020

High grades

GRAPHITE GRADE EX60

PropertiesUnitsValues
Apparent Densityg/cc1.80
Typical Grain Sizemm0.010
HardnessShore62
Breaking Strength FlexuralMPa
Kg/cm²
815
13
Specific ResistanceΩm x 10-613
Surface FinishVDI
Ra
30 ~ 24
3.15 ~ 1.60
Maximum block sizemm310 x 620 x 1220

GRAPHITE GRADE EX70

PropertiesUnitsValues
Apparent Densityg/cc1.85
Typical Grain Sizemm0.006
HardnessShore70
Breaking Strength FlexuralMPa
Kg/cm²
68.8
700
Specific ResistanceΩm x 10-615
Surface FinishVDI
Ra
27 ~ 21
2.24 ~ 1.12
Maximum block sizemm235 x 440 x 1000

Premium grades

GRAPHITE GRADE EDX-6

PropertiesUnitsValues
Apparent Densityg/cc1.88
Typical Grain Sizemm0.005
HardnessShore65
Breaking Strength FlexuralMPa
Kg/cm²
865
15
Specific ResistanceΩm x 10-615
Surface FinishVDI
Ra
24 ~ 18
1.60 ~ 0.80
Maximum block sizemm111 x 305 x 610

GRAPHITE GRADE EDX-7

PropertiesUnitsValues
Apparent Densityg/cc1.82
Typical Grain Sizemm0.003
HardnessShore68
Breaking Strength FlexuralMPa
Kg/cm²
95.0
970
Specific ResistanceΩm x 10-617
Surface FinishVDI
Ra
21 ~ 15
1.12 ~ 0.56
Maximum block sizemm100 x 300 x 400

Other applications for Ibiden graphite

As well as electrical discharge machining, Ibiden graphite is used in a number of industrial areas, including:

  • Silicon semiconductor fields
  • Compound semiconductor fields
  • Energy-related parts
  • Next generation energy equipment

Carbon Gouging Rods

Coidan Graphite Products supply Carbon gouging rods which are used for metal removal at fast rates with low power consumption. Generally used to remove welding defects, excess welds and foundry risers from cast products. Our carbon gouging rods are precisely machined and manufactured in state of the art facilities.

Pointed Copper-Coated Gouging Carbon Rods (D.C.)

Pointed carbon gouging rods are energy efficient and cost competitive, some operators prefer these rods due to the positive holding of a gouging rod in the electrode holder leading to less splatter in manual applications.

Pointed Copper – Coated Gouging Carbon Rods (D.C.)

Products CodeDia. x Length mmCurrent Range (A)Application
CGP503.23.2 x 305 (355)130-180Gouging rod – Use for cutting, welding, defects removing, making holes, welding inspection and removing over-welded parts.
CGP5044 x 305(355)150-200
CGP5055 X 305(355200-250
CGP5066 X 305(355)300-350
CGP506.56.5 X 305(355)320-370
CGP5077 X 355350-400
CGP5088 x 305(355)(455)(510)400-450
CGP5099 x 305(355)(455)(510450-500
CGP51010 x 305(355)(455)(510)500-550
CGP51111 x 305(355)(455)(510)600-650
CGP51212 x 305(355)(455)(510)750-850
CGP51313 x 305(355)(430)(510)800-1000
CGP51616 x 305(355)(430)(510)100-1200
CGP51919 x 305(355)(430)(510)1200-1400
CGP52525 x 305(355)(430)(510)1400-1600

Flat Gouging Carbon Rods (D.C.)

Pointed carbon gouging rods are energy efficient and cost competitive, some operators prefer these rods due to the positive holding of a gouging rod in the electrode holder leading to less splatter in manual applications.

Flat Gouging Carbon Rods (D.C.)

Product CodeDia.  x Length mm Current Range (A)Application
CGP53253 x 25×355300-350Flat gouging rods are designed for close tolerance metal removal and scarfing application producing a rectangular groove.
CGP54124 x 12 x 355200-250
CGP55105 x 10 x 355250-300
CGP55125 x 12 x 355300-350
CGP55155 x 15 x 355(305)350-400
CGP55185 x 18 x 355400-450
CGP55205 x 20 x 355450-500
CGP55255 x 25 x 355500-550
CGP56206 x 20 x 355550-600

Jointed Gouging Carbon Rods (D.C.)

Jointed carbon gouging rods are machined with male and female ends allowing continuous operation with no wastage of stub ends. These items can be used in manual and automatic applications with high metal removal rates.

Jointed Gouging Carbon Rods (D.C)

Product CodeDia. x Length mmCurrent Range (A)Application
CGP506.5J6.5 x 355400-500Jointed gouging rod have the  added benefit of working without stub loss with each rod having male & female parts, can be used with manual and automatic torches.
CGP508J8 x 355(430)500-550
CGP509J9 x 355(430)550-600
CGP510J10 x 355(430)(455)(510)600-650
CGP511J11 x 355(430)(455)(510)650-700
CGP512J12 x 355(430)(455)(510)700-800
CGP513J13 x 355(430)(455)(510)800-1000
CGP516J16 x 355(430)(455)(510)1000-1200
CGP519J19 x 355(430)(455)(510)1200-1400
CGP525J25 x 355(430)(455)(510)1400-1600
Electrical discharge machining