Carbon brush grades

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

Grade	Ohm (in)	mOhm (m)	Hardness	PSI	N/MM2	VD	CF	Film #	Amp/in2	Amp/cm2
H	0.0011000	27	55	3000	20.7	M	M	1	40	6.2
H250	0.0008000	20	60	6700	46.2	M	M	1	50	7.8
H357	0.0012000	30	50	2800	19.3	M	M	1	55	8.5
H422	0.0100000	197	50	3600	27.9	H	L	1	60	9.3
H990	0.0027000	67	70	4300	29.6	H	H	1	40	6.2
NH12	0.0320000	800	45	3025	20.1	H	L	1	55	8.5
NH16	0.0200000	500	25	2200	15.2	H	VL	1	55	8.5
NH4	0.0016000	40	45	2500	17.2	M	L	1	50	7.8

ELECTROGRAPHITE

Grade	Ohm (in)	mOhm (m)	Hardness	PSI	N/MM2	VD	CF	Film #	Amp/in2	Amp/cm2
H22	0.00075	18	45	3000	25.6	M	L	2	70	10.9
H23	0.0015	37	70	4500	31.0	M	L	1	70	10.9
H24	0.0016	40	55	4100	26.2	M	L	2	80	12.4
H25	0.0012	30	65	5100	35.2	M	L	2	80	12.4
H27	0.0017	43	65	3900	26.9	H	VL	2	80	12.4
H28	0.0018	46	45	2600	17.9	M	VL	2	80	12.4
H3	0.00035	9	35	3500	24.1	M	VL	3	70	10.9
H34	0.0022	55	75	4400	30.3	H	L	2	80	12.4
H35	0.0022	55	50	2500	17.2	H	L	2	90	14.0
H36	0.0022	55	70	3300	22.8	H	VL	3	80	12.4
H37	0.0018	46	70	4400	30.3	H	VL	2	80	12.4
H38	0.0020	50	80	5400	37.2	M	VL	2	80	12.4
H39	0.0016	40	85	5400	37.2	H	VL	3	80	12.4
H41	0.0025	62	60	3000	20.7	H	VL	3	80	12.4
H43	0.0018	46	65	3700	25.5	M	L	2	90	14.0
H4399	0.0008	20	45	4000	27.6	H	L	3	80	12.4
H44	0.0017	42	85	5500	37.9	M	L	2	80	12.4
H4430	0.0022	55	48	2500	17.2	VH	L	3	80	12.4
H45	0.0025	62	55	3300	22.8	H	VL	3	80	12.4
H46	0.0010	25	25	1500	10.3	M	L	2	80	12.4
H47	0.0025	62	40	1500	10.3	H	L	2	80	12.4
H49	0.0025	62	45	2000	13.8	H	L	2	90	14.0
H50	0.0021	52	60	2900	20.0	M	L	2	90	14.0
H51	0.0022	55	60	3200	22.1	M	VL	2	80	12.4
H52	0.0022	55	60	2900	20.0	H	L	2	80	12.4
H55	0.0011	27	50	3975	27.4	M	L	3	75	11.6
H57	0.0021	52	50	2600	17.9	M	L	2	90	14.0
H580	0.00036	9	40	3700	25.5	M	L	1	90	14.0
H60	0.0021	53	75	5300	36	H	VL	3	80	12.4
H61	0.0006	15	30	1500	10.3	M	VL	2	75	11.6
H74	0.0030	75	55	1800	12.4	H	VL	3	80	12.4
H76	0.0030	75	65	2400	16.6	H	L	3	80	12.4
H77	0.0026	65	40	1800	12.4	H	VL	3	80	12.4
H82	0.0016	40	64	5000	34.4	M	L	2	80	12.4
H83	0.0017	42	70	3000	20.7	H	L	2	80	12.4
H84	0.0017	42	80	5500	37.9	H	L	2	80	12.4
HH	0.0006	15	40	3000	20.7	L	L	1	75	11.6

GRAPHITE

Grade	Ohm (in)	mOhm (m)	Hardness	PSI	N/MM2	VD	CF	Film #	Amp/in2	Amp/cm2
H552	0.0005000	12	15	2000	13.8	L	L	2	60	9.3
H610	0.0008000	20	20	4700	32.4	M	L	2	60	9.3
H619	0.0019000	47	35	5500	37.9	VH	L	3	50	7.8
H621	0.0700000	1778	45	4500	31.0	VH	L	3	30	4.7
H646	0.0100000	250	30	5000	34.5	H	L	1	60	9.3
H649	0.0098000	245	35	2600	17.9	H	L	2	65	10.1
H651	0.0100000	250	35	4300	29.6	H	L	2	55	8.5
H700	0.0004000	10	25	2300	15.9	M	L	1	70	10.9
H702	0.0010000	25	15	700	4.8	M	M	1	60	9.3
H704	0.0006000	15	15	1000	6.9	M	L	1	60	9.3
H7240	0.1700000	4250	55	4000	27.6	VH	M	2	25	3.9
K018	0.0007	17.7	40	3000	20.7	M	L	3	80	12.4
K094	0.0600000	1400	37	2100	15.9	VH	L	3	30	4.7
K174	0.0080000	200	27	1900	13.1	H	L	3	55	8.5
K194	0.0030000	76	25	4500	31.0	H	L	3	55	8.5
K214	0.0350000	889	37	3000	20.7	VH	L	2	55	8.5
K224	0.0080000	200	30	4000	27.6	VH	VL	2	55	8.5
K244	0.0400000	1020	35	2600	17.9	VH	L	2	40	6.2
K254	0.0009000	30	40	3500	2.0	H	L	2	80	12.4
K294	0.0250000	530	35	2000	13.8	H	L	2	55	8.5

COPPER GRAPHITE

Grade	Ohm (in)	mOhm (m)	Hard	PSI	N/mm2	VD	CF	Film#	Amp/in2	Amp/cm2	Metal %
6H1	0.0002600	6.50	30	2700	18.6	M	L	1	100	15.5	30
6H2	0.0001200	3.00	30	3700	25.5	L	L	1	110	17.1	40
6H3	0.0000600	1.80	25	3200	22.1	L	L	1	120	18.6	50
6H6	0.0005000	9.70	35	2500	17.2	M	L	1	90	14	15
6H7	0.0000330	0.64	25	3400	23.4	L	L	1	130	20.2	65
6H8	0.0000130	0.33	22	4500	31.0	VL	L	1	140	21.7	75
H670	0.0001800	4.50	40	5100	35.2	L	L	2	110	17.1	40
H671	0.0002500	6.30	50	6000	41.3	L	M	1	110	17.1	30
H680	0.0000032	0.08	18	9300	64.1	L	L	1	150	23.3	87
H682	0.0000050	0.13	25	5100	35.2	L	VL	1	140	21.7	75
H692	0.0000027	0.07	18	8800	60.7	VL	L	1	160	24.8	90
H693	0.0000024	0.06	20	11500	80.0	VL	L	1	175	27.1	95
H4333	0.0001500	3.00	23	4000	27.5	VL	L	2	130	20.2	40
H4375	0.0003000	6.60	23	3000	20.7	VL	L	2	110	17.1	30
K025	0.0001400	1.80	25	3300	22.8	M	L	1	120	18.6	50
K045	0.0001100	2.80	25	4500	31.0	M	L	2	110	17.1	40
K075	0.0002600	6.60	25	4000	27.5	M	L	2	100	15.5	30
K076	0.0000200	0.50	13	13000	89.6	VL	L	1	175	27.1	91
K085	0.0001000	2.54	25	3300	22.8	M	L	1	125	19.3	50
K086	0.0000020	0.05	7	9000	62.1	VL	L	1	160	24.8	91
K106	0.0000040	0.10	8	6150	42.4	VL	L	1	150	23.3	85
K107	0.0000030	0.08	25	6500	44.8	VL	L	2	130	20.2	59
K136	0.0000130	0.33	18	4800	33.1	VL	L	1	140	21.7	75
K165	0.00030	6.6	25	2500	17.2	L	L	2	110	17.1	43
K175	0.00016	4.06	45	5000	34.4	L	L	2	110	17.1	40
K176	0.000033	8.4	25	5000	34.4	L	L	1	130	20.2	65
K216	0.00010	2.54	20	4000	27.5	L	L	1	140	21.7	77.5
K236	0.0000200	0.50	20	9000	62.1	L	VL	1	150	23.3	85
K275	0.0013	33.02	25	4000	27.5	M	L	2	80	12.4	27
K286	0.000015	3.00	5	6000	41.3	L	L	1	160	24.8	94
K425	0.00019	4.82	25	5000	34.4	L	L	1	100	15.5	42
K535	0.000004	1.02	25	5000	34.4	L	L	2	110	17.1	50
K676	0.000014	0.35	25	5400	37.2	L	L	2	120	18.6	67
K736	0.000007	0.17	20	7500	51.6	L	L	1	130	20.2	73

SILVER GRAPHITE

Grade	Ohm (in)	mOhm (m)	Hard	PSI	N/mm2	VD	CF	Film#	Amp/in2	Amp/cm2	Metal %
K017	0.00005	1.27	20	3800	26.7	VL	L	2	140	21.7	50
K037	0.0000020	0.050	6	6000	41.3	VL	L	1	200	31.0	91
K047	0.0003000	7.600	25	4500	31.0	L	L	2	100	15.5	29
K057	0.0000080	0.160	20	5500	37.9	VL	L	1	160	24.8	77
K087	0.00006	1.52	25	3500	24.1	VL	L	3	130	20.1	50