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EDM - Spark erosion

Graphit Kropfmühl GmbH's operations around the world draw on more than 140 years of raw material experience and expertise. The company belongs to the market-listed AMG Advanced Metallurgical Group N.V. and has established itself as a leading graphite specialist. Using modern and quality-conscious processes, we develop premium special products in the fields of graphite powder, graphite dispersions and machined graphite parts in intensive dialogue with our customers and partners.

In an effort to ensure the raw material supply, we hold a stake in mines in Africa, Asia and Europe and benefit from long-term relationships with Nippon Kornmeyer Carbon Group GmbH and their outstanding raw material qualities in the field of machined parts for EDM spark erosion.

Benefit from our long-standing experience as graphite specialists - we are happy to advise you!

EDM Spark Erosion Graphite Qualities

GK-200N GK-300N GK-500N GK-600N GK-700N GK-900N
Property Coarse Universal Universal Fine Fine Superfine
Average grain size [µm] 11 7 5 4 3 2
Ash content [%] 0,05 0,05 0,10 0,10 0,10 0,10
Density [g/cm³] 1,80 1,80 1,85 1,87 1,93 1,70
Hardness [shore] 57 60 83 68 83 75
Bending strength [MPa] 44 50 78 61 74 95
Spec. el. resistivity [µΩ-m] 12,5 13,0 18,0 14,5 15,0 17,5
Therm. expansion [K<sup>-1</sup> x 10<sup>-6</sup>] 4,6 5,0 5,6 5,6 6,0 5,3
Therm. conductivity [W/mK] 116 105 70 90 90 k.A.

The measurements are average values that may change slightly.

Achievable Surface Quality

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

 

GK-200N

 

 

GK-300N

 

 

GK-500N

 

 

GK-600N/700N

 

 

GK-900N