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Graphite grades

for EDM application

Feature
Unit
Rough
CP-1000®
Universal
CP-1100®
Universal
CP-1250®
Fine
CP-1300®
Superfine
CP-1500®
Grain size µØ 12 7 5 4 3
Bulk density g/cm³ 1,80 1,83 1,85 1,87 1,88
Hardness shore 60 66 76 68 75
Elect. resistivity µΩm 13,0 15,0 18,0 14,5 17,5
Flexual strength MPa (N/mm²) 50 54 63 61 95
Compr. strength MPa (N/mm²) 103 114 118 137 190
Tensile strength MPa (N/mm²) 33 35 51 40 n/a
Coeff. of thermal expansion (cte) k x 10-6 /°C 5,0 5,0 5,6 5,6 5,3
Thermal conductivity W/mK 105 105 70 90 n/a
Ash content % 0,05 0,05 0,10 0,10 0,10
Max. bloc size mm 1020x 630x 350mm 1020x 630x 350mm 1020x 630x 350mm 950x 380x 155mm 1000x 350x 140 mm
Structure x100

The values of physical properties shown above are approximate. Producer of the graphite grades is the oldes japanese producer. CP-Handels is the exclusive dealer within Europe.

CP-1250 is the follow up grade of CP-1200. CP is a registered trade mark of CP-Handels GmbH.

Surface finishing

VDI 3400 12 15 18 21 24 27 30 33 36 39 42 45
Ra µm 0,40 0,56 0,80 1,12 1,60 2,24 3,15 4,50 6,30 9,00 12,50 18,00
Ra µin 16 22 31 44 63 88 124 177 248 354 492 709
                        CP-1000        
                CP-1100              
          CP-1250                  
      CP-1300                      
    CP-1500                          

hint:
Latest generators of EDM sinking machines reduced the wear of electrodes significant. Also with universal grades are sharp edges and smoother surfaces possible. Please call us for futher advice. All EDM machine producers have experience with our graphite grades.