EDM Specialty Graphite Grades


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Graphite Materials & Systems (GMS)




	Our EDM Specialty Graphite Grades

Suitable grades are available for all applications.
We supply rectangular blocks and cylinders which can also be cut to size if requested.

Range of applications

R 8340 efficient grade for roughing more...	R 8500 X grade for roughing and prefinishing more...	R 8500 universal grade for toolmakers more...

R 8510 wear resistant fine grain graphite for high demands more...	R 8650 finishing grade for highest accuracy more...	R 8710 high premium finishing grade to fulfill superior EDM tasks more....

Physical properties (average values)
		R 8340	R 8500 X	R 8500	R 8510	R 8650	R 8710
Density	g/cm³	1.72	1.75	1.77	1.83	1.84	1.88
Porosity	%	15	14	13	10	10	10
Average grain size	µm	15	12	10	10	7	3
Pore size	µm	2.0	2.0	1.5	1.5	0.8	0.6
Permeabilty	x 10^-2cm²/sec	15	15	10	4	3	1
Rockwell hardness		80 HR10/100	80 HR 5/100	70 HR 5/100	95 HR 5/100	95 HR 5/100	110 HR 5/100
Flexural strength	N/mm²	45	43	50	60	65	85
Youngs modulus	kN/mm²	10.5	10	10.5	11.5	12.5	13.5
Electrical resistivity	µm	12	15	14	13	14	13
Thermal conductivity	W·m^-1·K^-1	90	80	80	100	90	100
Thermal expansion (20-200°C)	x 10^-6/K	2.9	3.8	3.9	4.0	3.9	4.7
Ash value	max. %	0.2	0.2	0.2	0.2	0.2	0.2
On the data sheet for each grade you will find also US measures as well as the test standard.		more...	more...	more...	more...	more...	more....

Dimensions (minimum sizes in mm)
R 8340	R 8500 X R 8500	R 8510	R 8650	R 8710
1550 x 410 x 200	1230 x 500 x 400	1230 x 1030 x 330	1230 x 480 x 260	610 x 390 x 190
1230 x 500 x 400	610 x 500 x 400	1230 x 500 x 400	610 x 480 x 260
610 x 500 x 400		610 x 500 x 400

ø 150 x 1230
ø 180 x 1230
ø 200 x 1230
ø 225 x 1230
ø 250 x 1230
ø 280 x 1230
ø 320 x 1230
ø 350 x 1230
ø 380 x 1230
ø 420 x 1230

We do not charge for cutting standard blocks if this results in there being no off-cut material.

The information "Range of applications" and "Physical properties" is also
available in the following languages:

German

Swedish

Finnish

Norwegian

For information about material safety see our material safety data sheets which we will send you on request.

This document has been prepared according to the best current knowledge and is intended to provide general information about our products and their use. In view of the wide variety of possible applications, the above data should be regarded as general information and are no guarantee of certain features of our products in a given case. If you favour us with your order, please ask for information regarding the features needed for the proposed application. Our Technical Service will furnish a feature profile for such application without undue delay.

Our EDM Specialty Graphite Grades