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
H0.00112855300020.7MM1406.2
H2500.00082060670046.2MM1507.8
H3570.00123050280019.3MM1558.5
H4220.0125050360027.9HL1609.3
H9900.00276870430029.6HH1406.2
NH120.03280045302520.1HL1558.5
NH160.0250025220015.2HVL1558.5
NH40.00164045250017.2ML1507.8

Electrographite

GradeOhm (in)mOhm (m)HardnessPSIN/MM2VDCFFilm #Amp/in2Amp/cm2
H1700.00297480390026.9HVL27010.9
H220.00071845370025.6LH27010.9
H230.00174370400027.7ML17010.9
H240.00153855410028.4ML28012.4
H250.00123065400027.7ML28012.4
H270.00174365420029.1HVL28012.4
H280.00174345260017.9MVL28012.4
H30.000358.835310021.5MVL37010.9
H340.00235875440030.3HL28012.4
H350.00235850250017.2HL29014
H360.00235870330022.8HVL38012.4
H370.00174370490033.9HVL28012.4
H380.00215380540037.2MVL28012.4
H390.00174385540037.2HVL38012.4
H410.00256360300020.7HVL38012.4
H43990.00071845300020.7ML38012.4
H430.00194865370025.5ML29014
H440.00194885550037.9ML28012.4
H44250.001230.565400027.6ML38012.4
H44300.00235848250017.2VHL38012.4
H450.00256360330022.8HVL38012.4
H460.0012525150010.3ML28012.4
H470.00256345180012.4HL28012.4
H490.00256350200013.8HL210015.5
H500.00215360290020ML29014
H510.00235860320022.1MVL28012.4
H520.00235860290020HL28012.4
H550.00112850397527.4ML37511.6
H570.00235850260017.9ML210015.5
H5800.00036940370025.5ML110015.5
H610.00061530150010.3MVL27511.6
H740.0037655180012.4HVL38012.4
H760.0037665240016.6HL38012.4
H770.00266545180012.4HVL38012.4
H820.001537.564560038.6ML28012.4
H830.00174370300020.7HL28012.4
HH0.00069.540300020.7LL17511.6

Graphite

GradeOhm (in)mOhm (m)HardnessPSIN/MM2VDCFFilm #Amp/in2Amp/cm2
H5520.00051315200013.8LL2609.3
H6100.00082020470032.4ML2609.3
H6190.00194835450031VLL3507.8
H6210.07178045450031VLL3304.7
H6460.0125030500034.5HL1609.3
H6490.009824535260017.9HL26510.1
H6510.0125035430029.6HL2558.5
H7000.00041025230015.9ML17010.9
H7020.00125157004.8MM1609.3
H7040.0006151510006.9ML1609.3
H72400.17425055400027.6VHM2253.9
K018 0.000717.740300020.6ML38012.4
K0840.00123028300020.7HL28012.4
K0940.055140035230015.9VHM2558.5
K1740.00820020190013.1HL3558.5
K1940.00328125500034.5HL3558.5
K2140.03589037300020.7VHL2558.5
K2240.00820030400027.6VHVL2558.5
K2440.04102035260018VHL2406.2
K2540.00093040350024.2ML28012.4
K2940.02563035200013.5HL2558.5

Copper Graphite

GradeOhm (in)mOhm (m)HardPSIN/mm2VDCFFilm#Amp/in2Amp/cm2Metal %
6H10.000266.530270018.6ML19015.530
6H20.00012330370025.5LL111017.140
6H30.000071.825320022.1LL112018.650
6H60.000389.730250017.2ML1901415
6H70.0000250.6425340023.4LL113020.265
6H80.0000130.3323450031VLL114021.775
H6700.000184.540510035.2LL211017.140
H6710.000256.355600041.4LM111017.140
H6800.0000030.0818930064.1LL115023.387
H6820.0000050.1325510035.2LVL114021.775
H6920.0000030.0718880060.7VLL116024.890
H6930.0000020.06201150080VLL117527.195
H43330.00012330400027.5VLL213020.240
H43750.000266.630300020.7VLL211017.130
K0250.000071.825330022.8ML112018.650
K0450.000112.825450031.1LL21101740
K0750.000266.625400027.7ML210015.530
K0760.000020.5131300089.6VLL117527.191
K0850.000102.5425330022.8ML112519.350
K0860.0000020.057900062.1VLL116024.891
K1060.0000040.18400027.7VLL115023.385
K1150.000041.0210400027.68LL211017.0535
K1260.0000071.87710049VLM12003195
K1360.0000130.3320480033.1VLL114021.775
K1650.00036.625250017.2LL211017.143
K1750.000164.0645500034.4LL211017.140
K1760.0000330.8425500034.5LL113020.265
K2160.00012.5420400027.5LL114021.777.5
K2360.000020.520900062.05LVL115023.385
K2860.00001535600041.3LL116024.894
K5350.000041.025500034.6HVL212519.050

Silver Graphite

GradeOhm (in)mOhm (m)HardPSIN/mm2VDCFFilm#Amp/in2Amp/cm2Metal %
K0170.000071.820380026.2VLL214021.750
K0370.0000020.056600041.4VLL12003191
K0470.00037.625450031.1LVL210015.529
K0570.0000060.1620550037.9VLVL116024.875
K0870.000061.5225350024.1VLL313020.150
K1670.0000020.05510600041.4VLVL12003190
K2270.000041.0620340023VLL115023.360