Newyard Carbon are not only specialized manufacturing carbon brush materials such as electrographite, natural graphite, metal graphite and resin-bonded graphite but also the finished products for wind turbine, generator, industrial and traction motors and power tools as well.
Carbon Brush Materials - Electrographite, Metal Graphite, Nature Graphite and Resin-Bonded Graphite
Featured Series
Carbon Brush Materials - Electrographite, Metal Graphite, Nature Graphite and Resin-Bonded Graphite
Apprentice
Metal Graphite
This main raw material used for this class of brushes are electrolytic copper powder and graphite. According to the needs of users, powders of silver, lead and other metals may also be employed.
This class of brushes applicable to low voltage electrical machines with
heavy load and ordinary requirements of commutation. Generally, the peripheral speed should not exceed 30 m/s.
Heritage
This class of brushes consist of various kinds of carbon powders such as carbon black, coke, graphite and so on. They must undergo high
temperature treatment at about 2500℃ to make all kinds of carbonic material convert to a micro-rystalline form of artificial graphite. This class of brushes have excellent characteristic of commutating and self- lubricating, widely applied to all kinds of AC and DC motors with the advantage of long service life and less wear ability of the commutators.
Classical
Natural Graphite
The natural graphite is main raw material of this class of brushes. Here, pitch and resin are used binders.They are baked at about 1000℃. This class of brushes are provided with better lubricating and current- collecting performance. The natural graphite brushes are respectively used with the slip rings of small and medium size DC motor and high speed turbo-generators under steady applications.
Apprentice
Resin Bonded Graphite
This main raw material used for this
class of brushes are artificial graphite
powder. Pitch and resin are used
binders.
This class of brushes applicable to
power tools and home appliance.
Metal Graphite Grades
Metal Graphite - C412
Material Characteristics
Grade: C412
Resistivity (ohm/um): 0.2-0.25
Rockwell Hardness (HR10): 70-85
Voltage Drop (V): 0.5
Friction coef: 0.2
Rated Current Density: 20
Max. Speed (m/s): 20
Pressure in Use (kPa): 20
Main Application: current collector
Metal Graphite - CG90
Material Characteristics
Grade: CG90 – 90% Cu
Resistivity (ohm/um): 0.06-0.08
Rockwell Hardness (HR10): 82-90
Voltage Drop (V): 0.4
Friction coef: 0.25
Rated Current Density: 20
Max. Speed (m/s): 20
Pressure in Use (kPa): 20
Main Application:Low voltage AC Commutator machines with slip rings
Metal Graphite - CG82
Material Characteristics
Grades: CG82 – 82% Cu
Resistivity (ohm/um): 0.09-0.1
Rockwell Hardness (HR10): 60-80
Voltage Drop (V): 0.3
Friction coef: 0.2
Rated Current Density: 20
Max. Speed (m/s): 20
Pressure in Use (kPa): 20
Main Application:with low voltage and slip rings of AC commutator machines
Metal Graphite - CG72
Material Characteristics
Grades: CG72 – 72% Cu
Resistivity (ohm/um): 0.6-0.7
Rockwell Hardness (HR10): 75-90
Voltage Drop (V): 1.1
Friction coef:<0.2
Rated Current Density: 15
Max. Speed (m/s): 20
Pressure in Use (kPa): 17
Main Application:DC machines up to 40V,automobile starters and exciting slip rings of asynchronous machines
Metal Graphite - CG60
Material Characteristics
Grades: CG60 – 60% Cu
Resistivity (ohm/um): 2-2.5
Rockwell Hardness (HR10): 80-90
Voltage Drop (V): 1.3
Friction coef: 0.25
Rated Current Density: 15
Max. Speed (m/s): 35
Pressure in Use (kPa): 22
Main Application: automobile starters and exciting slip rings of synchronous machines
Metal Graphite - CG50
Material Characteristics
Grades: CG50 – 50% Cu
Resistivity (ohm/um): 2.5-3.5
Rockwell Hardness (HR10): 70-80
Voltage Drop (V): 1.5
Friction coef: 0.25
Rated Current Density: 15
Max. Speed (m/s): 25
Pressure in Use (kPa): 17
Main Application:DC genertators up to 60V and DC welding machine .etc
Metal Graphite - CG25
Material Characteristics
Grades: CG25 – 25% Cu
Resistivity (ohm/um): 8-10
Rockwell Hardness (HR10): 55-70
Voltage Drop (V): 1.8
Friction coef: 0.25
Rated Current Density: 12
Max. Speed (m/s): 20
Pressure in Use (kPa): 17
Main Application:DC machines up to 80V,small traction motors and slip rings of asynchronous
motors
Electrographite Grades
Electrographite - E17
Material Characteristics
Grade: E17
Resistivity (ohm/um): 0.2-0.25
Rockwell Hardness (HR10): 70-85
Voltage Drop (V): 0.5
Friction coef: 0.2
Rated Current Density: 20
Max. Speed (m/s): 20
Pressure in Use (kPa): 20
Main Application: Sling rings of high speed turbo-generators
Electrographite - E30
Material Characteristics
Grade: E17
Resistivity (ohm/um): 38-45
Rockwell Hardness (HR10): 70-80
Voltage Drop (V): 2.6
Friction coef: 0.25
Rated Current Density: 10
Max. Speed (m/s): 40
Pressure in Use (kPa): 29
Main Application: 120-440DC machines automobile generators
Electrographite - E33
Material Characteristics
Grade: E33
Resistivity (ohm/um): 50-60
Rockwell Hardness (HR10): 78-90
Voltage Drop (V): 2.8
Friction coef: 0.25
Rated Current Density: 12
Max. Speed (m/s): 50
Pressure in Use (kPa): 29
Main Application: Rolling stock motors and main generators, AC commutator motors, and other DC motors
Electrographite - E33N
Material Characteristics
Grade: E33N
Resistivity (ohm/um): 50-60
Rockwell Hardness (HR10): 80-90
Voltage Drop (V): 2.8
Friction coef: 0.2
Rated Current Density: 12
Max. Speed (m/s): 60
Pressure in Use (kPa): 29
Main Application: Rolling stock motors and main generators, AC commutator motors, and other DC motors
Electrographite - E33F
Material Characteristics
Grade: E33N
Resistivity (ohm/um): 50-60
Rockwell Hardness (HR10): 85-100
Voltage Drop (V): 2.7
Friction coef: 0.2
Rated Current Density: 12
Max. Speed (m/s): 50
Pressure in Use (kPa): 29
Main Application: traction motors and main generators for locomotives and high speed excites for turbo-generators
Electrographite - E908
Material Characteristics
Grade: E33N
Resistivity (ohm/um): 60-67
Rockwell Hardness (HR10): 70-75
Voltage Drop (V): 2.9
Friction coef: 0.2
Rated Current Density: 12
Max. Speed (m/s): 40
Pressure in Use (kPa): 29
Main Application: Small DC machines with high angular velocity 110v power tools with high current density
Natual Graphite Grades
Natural Graphite - NG734
Material Characteristics
Grade:NG734
Resistivity (ohm/um): 17-20
Rockwell Hardness (HR10): 55-70
Voltage Drop (V): 2.5
Friction coef: 0.27
Rated Current Density: 10
Max. Speed (m/s): 80
Pressure in Use (kPa): 17
Main Application:especially suitable for slip rings of large turbogenerators
Pitch-bonded Graphite Grades
Pitch-bonded Graphite - R211
Material Characteristics
Grade:R211
Resistivity (ohm/um): 17-20
Rockwell Hardness (HR10):55-706
Voltage Drop (V): 2.5
Friction coef: 0.27
Rated Current Density: 10
Max. Speed (m/s): 80
Pressure in Use (kPa): 17
Main Application:DC or AC commutator machines, forklift application
Resin-Bonded Graphite Grades
RESIN-BONDED GRAPHITE - P89
Material Characteristics
Grade: P89
Resistivity (ohm/um): 1550-1650
Shore Hardness: 20
Density (g/cm3): 1.4
Friction coef: very low
Voltage Drop: very high
Rated Current Density: 11
Max. Speed (m/s): 50
Main Application: 240v power tools and vacuum cleaner <2000w
RESIN-BONDED GRAPHITE - P84
Material Characteristics
Grade: P84
Resistivity (ohm/um): 900-950
Shore Hardness: 23
Density (g/cm3): 1.45
Friction coef: very low
Voltage Drop: very high
Rated Current Density: 10
Max. Speed (m/s):25
Main Application: 110v power tools <1600w
RESIN-BONDED GRAPHITE - P81
Material Characteristics
Grade: P81
Resistivity (ohm/um): 900-950
Shore Hardness: 18
Density (g/cm3): 1.42
Friction coef: very low
Voltage Drop: very high
Rated Current Density: 10
Max. Speed (m/s): 35
Main Application: 240v power tools <1500w
RESIN-BONDED GRAPHITE - P015
Material Characteristics
Grade: P015
Resistivity (ohm/um): 900-950
Shore Hardness: 18
Density (g/cm3): 1.42
Friction coef: very low
Voltage Drop: very high
Rated Current Density: 10
Max. Speed (m/s): 35
Main Application: 230V chain saw and jig saw
EQUIVALENT GRADE RECOMMENDATIONS
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