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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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.) |
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| 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.) |
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| 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 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) |
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| 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 | |
