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 below 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 e-mail information regarding the features needed for the proposed application. Our Technical Service will furnish a feature profile for each application without undue delay.
 
Semiconductor industry／Ion implantation／Lighting industry
 
Property unit R6300 R6340 R6400 R6500 R6510 R6650 R6710
Density g/cm³ 1.73 1.73 1.75 1.77 1.84 1.85 1.88
Porosity(open) % 15 15 14 13 10 10 10
Grain size µm 20 15 10 10 10 7 3
Hardness Rockwell B HR 80 10/100 80 10/100 100 10/100 70 5/100 95 5/100 95 5/100 110
5/100
E-Modulus N/mm² 10000 10500 9500 10500 11500 12500 14000
Flexural strength N/mm² 40 45 45 50 60 65 85
Compressive strength N/mm² 90 90 100 120 125 150 240
Specific electrical resistance µnm 17 12 14 14 13 14 13

Thermal expansion
(20 -1000°C )

10-6K-1 3.8 4.0 5.3 5.0 5.1 5.0 5.8
Thermal conductivity Wm-1K-1 65 90 105 80 100 90 100
 
Typical analysis
 
Code Ash Element concentration
  value A B Ca Co Cr Cu Fe K Ma Mn Na Ni P S Si Ti V
P10 <10ppm <0.1 0.05 <0.1 <0.1 <0.05 <0.05 <0.05 <1 <0.05 <0.1 <1 <0.1 <0.3 <2 0.5 <0.1 0.1
 
Materials for Mechanical Applications
 
Grades EK20 EK2200 EK2240 EK200 EK3205
Density g/cc 1.70 1.82 1.81 1.82 2.25
Flesural strength MPa 55 75 70 50 95
Compressive strength MPa 155 200 210 220 260
Hardness HR 105 110 115 115 115
Thermal expansion E¯6/K 3 5 5.4 7.7 4.0
Thermal conductivity W/mK 12 14 17 26 20
Temperature
(in ox. Atm.) ℃ 		400 200 200 200 400
Materials Carbon-Graphite Carbon-Graphite Carbon-Graphite Graphite Carbon-Graphite
Typical Applications Wet running bearings High loaded seals, bearings Seals, bearings for dry running Bearings, seals for compressors High loaded seals, bearings
 
 
molds
 
Property Unit R8340 R8500X R8500 R8510 R8650 R8710
Bulk Density g/cm³ 1.72 1.75 1.77 1.83 1.84 1.88
Open porosity % 15 14 13 10 10 10
Average grain size µm 15 12 10 10 7 3
Medium pore size µm 2.0 2.0 1.5 1.5 0.8 0.6
Permeability
(air at 20°C / 68°F ) 		*10¯²cm²/sec 15 15 10 4 3 1
Rockwell hardness 　 80 HR
10/100 		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
Young‘s modulus kN/mm² 10.5 10 10.5 11.5 12.5 14
Specific electrical resistivity µ m 12 15 14 13 14 13
Thermal conductivity W·m-1·K -1 90 80 80 100 90 100
Therm. expansion
(20 -200° C / 68 -392°F ) 		K-1*10¯6 2.9 3.8 3.9 4.0 3.9 4.7
Ash value ppm 2000 2000 2000 2000 2000 2000
 
Property Unit R4340 R4500 R4550
Bulk Density g/cm³ 1.72 1.77 1.83
Open porosity % 15 10 10
Average grain size µm 15 10 10
Medium pore size µm 2.0 1.5 1.5
Permeability
(air at 20°C / 68°F ) 		*10¯²cm²/sec 15 10 4
Rockwell hardness   80 HR
10/100 		70 HR
5/100 		95 HR
5/100
Flexural strength N/mm² 45 50 60
Young‘s modulus kN/mm² 10.5 10.5 11.5
Specific electrical resistivity µ m 12.0 14.0 13.0
Thermal conductivity W·m-1·K -1 90 80 100
Therm. expansion
(20 -200° C / 68 -392°F ) 		K-1*10¯6 2.9 3.9 4.0
Ash value ppm 200 200 20