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EDM Graphite Grades


Each of our EDM graphite grades has been tailored for a specific range of electrode applications with benchmarked performance characteristics.

With our 50 years in the industry we have developed the best balance of metal removal rates, low electrode wear, and fine surface finish. Our EDM Electrode materials provide excellent total cost of ownership. Our manufacturing process is tightly controlled to provide you with consistent performance from block to block, year to year. Our educated applications engineers are available to assist with grade selection and machine parameters for your specific applications.

Our graphite grades are available as billets, semi-finished rods, blocks, and plates. 

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Narrow Your Selection
Our EDM-AF5® graphite is the premier Angstrofine graphite electrode material available on the market today with an average particle size of less than 1 micron.
Average Particle Size (μ)
  • <1
Flexural Strength (psi)
  • 14,500
Hardness (shore)
  • 83
Electrical Resistivity (μOhm-in)
  • 850
Our Ultrafine EDM-4® graphite combines high strength with moderate hardness, which are ideal for intricate electrodes. The EDM-4 graphite performance characteristics provide excellent cost of ownership.
Average Particle Size (μ)
  • <4
Flexural Strength (psi)
  • 17,500
Hardness (shore)
  • 76
Electrical Resistivity (μOhm-in)
  • 500
EDM-C3® graphite is a premium, Ultrafine grade graphite infiltrated with copper. It is unequaled for the production of fragile electrodes.
Electrical Resistivity (μOhm-in)
  • 127
Hardness (shore)
  • 66
Flexural Strength (psi)
  • 20,300
Average Particle Size (μ)
  • <5
EDM-3® graphite is the most preferred Ultrafine graphite grade and the proven industry standard.
Average Particle Size (μ)
  • <5
Flexural Strength (psi)
  • 13,300
Hardness (shore)
  • 73
Electrical Resistivity (μOhm-in)
  • 615
EDM-2® graphite is an Ultrafine grade that displays high strength and good wear characteristics.
Average Particle Size (μ)
  • <5
Flexural Strength (psi)
  • 11,200
Hardness (shore)
  • 71
Electrical Resistivity (μOhm-in)
  • 620
EDM-1® graphite is an Ultrafine graphite that provides good wear, speed, and finish.
Average Particle Size (μ)
  • <5
Flexural Strength (psi)
  • 9,700
Hardness (shore)
  • 69
Electrical Resistivity (μOhm-in)
  • 760
EDM-C200® graphite is a Superfine grade infiltrated with copper, ideal for improving cutting stability in conditions with poor flushing.
Average Particle Size (μ)
  • 10
Flexural Strength (psi)
  • 12,100
Hardness (shore)
  • 62
Electrical Resistivity (μOhm-in)
  • 114