Grade Data

Many of the grades used today are derived through variations in raw materials, molding pressure, temperature, duration of the baking process and after-treatments. All brush grades fall into five categories and are represented by the tables below.

Carbon Graphite

GradeOhm (in)mOhm (m)HardnessPSIN/MM2VDCFFilm #Amp/in2Amp/cm2
H0.00110002755300020.7MM1406.2
H2500.00080002060670046.2MM1507.8
H3570.00120003050280019.3MM1558.5
H4220.010000019750360027.9HL1609.3
H9900.00270006770430029.6HH1406.2
NH120.032000080045302520.1HL1558.5
NH160.020000050025220015.2HVL1558.5
NH40.00160004045250017.2ML1507.8

Electrographite

GradeOhm (in)mOhm (m)HardnessPSIN/MM2VDCFFilm #Amp/in2Amp/cm2
H220.000751845300025.6ML27010.9
H230.00153770450031.0ML17010.9
H240.00164055410026.2ML28012.4
H250.00123065510035.2ML28012.4
H270.00174365390026.9HVL28012.4
H280.00184645260017.9MVL28012.4
H30.00035935350024.1MVL37010.9
H340.00225575440030.3HL28012.4
H350.00225550250017.2HL29014.0
H360.00225570330022.8HVL38012.4
H370.00184670440030.3HVL28012.4
H380.00205080540037.2MVL28012.4
H390.00164085540037.2HVL38012.4
H410.00256260300020.7HVL38012.4
H430.00184665370025.5ML29014.0
H43990.00082045400027.6HL38012.4
H440.00174285550037.9ML28012.4
H44300.00225548250017.2VHL38012.4
H450.00256255330022.8HVL38012.4
H460.00102525150010.3ML28012.4
H470.00256240150010.3HL28012.4
H490.00256245200013.8HL29014.0
H500.00215260290020.0ML29014.0
H510.00225560320022.1MVL28012.4
H520.00225560290020.0HL28012.4
H550.00112750397527.4ML37511.6
H570.00215250260017.9ML29014.0
H5800.00036940370025.5ML19014.0
H600.00215375530036HVL38012.4
H610.00061530150010.3MVL27511.6
H740.00307555180012.4HVL38012.4
H760.00307565240016.6HL38012.4
H770.00266540180012.4HVL38012.4
H820.00164064500034.4ML28012.4
H830.00174270300020.7HL28012.4
H840.00174280550037.9HL28012.4
HH0.00061540300020.7LL17511.6

Graphite

GradeOhm (in)mOhm (m)HardnessPSIN/MM2VDCFFilm #Amp/in2Amp/cm2
H5520.00050001215200013.8LL2609.3
H6100.00080002020470032.4ML2609.3
H6190.00190004735550037.9VHL3507.8
H6210.0700000177845450031.0VHL3304.7
H6460.010000025030500034.5HL1609.3
H6490.009800024535260017.9HL26510.1
H6510.010000025035430029.6HL2558.5
H7000.00040001025230015.9ML17010.9
H7020.001000025157004.8MM1609.3
H7040.0006000151510006.9ML1609.3
H72400.1700000425055400027.6VHM2253.9
K0180.000717.740300020.7ML38012.4
K0940.0600000140037210015.9VHL3304.7
K1740.008000020027190013.1HL3558.5
K1940.00300007625450031.0HL3558.5
K2140.035000088937300020.7VHL2558.5
K2240.008000020030400027.6VHVL2558.5
K2440.0400000102035260017.9VHL2406.2
K2540.0009000304035002.0HL28012.4
K2940.025000053035200013.8HL2558.5

Copper Graphite

GradeOhm (in)mOhm (m)HardPSIN/mm2VDCFFilm#Amp/in2Amp/cm2Metal %
6H10.00026006.5030270018.6ML110015.530
6H20.00012003.0030370025.5LL111017.140
6H30.00006001.8025320022.1LL112018.650
6H60.00050009.7035250017.2ML1901415
6H70.00003300.6425340023.4LL113020.265
6H80.00001300.3322450031.0VLL114021.775
H6700.00018004.5040510035.2LL211017.140
H6710.00025006.3050600041.3LM111017.130
H6800.00000320.0818930064.1LL115023.387
H6820.00000500.1325510035.2LVL114021.775
H6920.00000270.0718880060.7VLL116024.890
H6930.00000240.06201150080.0VLL117527.195
H43330.00015003.0023400027.5VLL213020.240
H43750.00030006.6023300020.7VLL211017.130
K0250.00014001.8025330022.8ML112018.650
K0450.00011002.8025450031.0ML211017.140
K0750.00026006.6025400027.5ML210015.530
K0760.00002000.50131300089.6VLL117527.191
K0850.00010002.5425330022.8ML112519.350
K0860.00000200.057900062.1VLL116024.891
K1060.00000400.108615042.4VLL115023.385
K1070.00000300.0825650044.8VLL213020.259
K1360.00001300.3318480033.1VLL114021.775
K1650.000306.625250017.2LL211017.143
K1750.000164.0645500034.4LL211017.140
K1760.0000338.425500034.4LL113020.265
K2160.000102.5420400027.5LL114021.777.5
K2360.00002000.5020900062.1LVL115023.385
K2750.001333.0225400027.5ML28012.427
K2860.0000153.005600041.3LL116024.894
K4250.000194.8225500034.4LL110015.542
K5350.0000041.0225500034.4LL211017.150
K6760.0000140.3525540037.2LL212018.667
K7360.0000070.1720750051.6LL113020.273

Silver Graphite

GradeOhm (in)mOhm (m)HardPSIN/mm2VDCFFilm#Amp/in2Amp/cm2Metal %
K0170.000051.2720380026.7VLL214021.750
K0370.00000200.0506600041.3VLL120031.091
K0470.00030007.60025450031.0LL210015.529
K0570.00000800.16020550037.9VLL116024.877
K0870.000061.5225350024.1VLL313020.150