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

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

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

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

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

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

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

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 Code Dia. x Length mm Current Range (A) Application
CGP503.2 3.2 x 305 (355) 130-180 Gouging rod – Use for cutting, welding, defects removing, making holes, welding inspection and removing over-welded parts.
CGP504 4 x 305(355) 150-200
CGP505 5 X 305(355 200-250
CGP506 6 X 305(355) 300-350
CGP506.5 6.5 X 305(355) 320-370
CGP507 7 X 355 350-400
CGP508 8 x 305(355)(455)(510) 400-450
CGP509 9 x 305(355)(455)(510 450-500
CGP510 10 x 305(355)(455)(510) 500-550
CGP511 11 x 305(355)(455)(510) 600-650
CGP512 12 x 305(355)(455)(510) 750-850
CGP513 13 x 305(355)(430)(510) 800-1000
CGP516 16 x 305(355)(430)(510) 100-1200
CGP519 19 x 305(355)(430)(510) 1200-1400
CGP525 25 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 Code Dia.  x Length mm  Current Range (A) Application
CGP5325 3 x 25×355 300-350 Flat gouging rods are designed for close tolerance metal removal and scarfing application producing a rectangular groove.
CGP5412 4 x 12 x 355 200-250
CGP5510 5 x 10 x 355 250-300
CGP5512 5 x 12 x 355 300-350
CGP5515 5 x 15 x 355(305) 350-400
CGP5518 5 x 18 x 355 400-450
CGP5520 5 x 20 x 355 450-500
CGP5525 5 x 25 x 355 500-550
CGP5620 6 x 20 x 355 550-600

Jointed Gouging Carbon Rods (D.C.)

Jointed carbon gouging rods are machined with male and female ends allowing continuous operation with no wasteage 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 Code Dia. x Length mm Current Range (A) Application
CGP506.5J 6.5 x 355 400-500 Jointed 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.
CGP508J 8 x 355(430) 500-550
CGP509J 9 x 355(430) 550-600
CGP510J 10 x 355(430)(455)(510) 600-650
CGP511J 11 x 355(430)(455)(510) 650-700
CGP512J 12 x 355(430)(455)(510) 700-800
CGP513J 13 x 355(430)(455)(510) 800-1000
CGP516J 16 x 355(430)(455)(510) 1000-1200
CGP519J 19 x 355(430)(455)(510) 1200-1400
CGP525J 25 x 355(430)(455)(510) 1400-1600
Electrical discharge machining