EG Carbon Brush
EG Carbon Brush is an electrographitic brush material produced from coke and pitch and graphitised at high temperature, classified as EG under JIS C2802 and in the D-type series of GB/T 1416, with EG-I and EG-HD variants.
Reference datasheet — EG Carbon Brush is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
EG Carbon Brush tempers and conditions
EG Carbon Brush is supplied in 2 conditions, soft to hard.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Resin/oil-impregnated electrographite | Choose when the machine runs in dry air, high altitude or vacuum-adjacent conditions where an untreated brush would dust badly. | 20 | 0.2 | 40 HV | 35 W/m·K | |
Fine-grain high-density electrographite for high current density | Pick for heavily loaded generators/slip rings needing higher current density and lower wear, at the cost of price and slightly harder commutator action. | 25 | 80 W/m·K |
Supply forms, finishes and certifications
Ways EG Carbon Brush is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EGDefault | Standard electrographite brush stock | Coating |
What is EG Carbon Brush?
EG Carbon Brush is an electrographitic brush material produced from coke and pitch and graphitised at high temperature, classified as EG under JIS C2802 and in the D-type series of GB/T 1416, with EG-I and EG-HD variants. It is chosen for low friction, stable commutation and good film formation on medium- and high-speed machines, and is supplied as machined brush blanks and slip-ring contact blocks. Its higher electrical resistance limits current density, and service is capped near 350 °C. For low-voltage, high-current duty use a metal-graphite (MG) brush instead. EG Carbon Brush has a density of 1.65 g/cm³ (0.0596 lb/in³), lighter than 95% of ceramic grades. It melts at 3,650°C (6,602 °F). EG Carbon Brush has a tensile strength of 14 MPa (2.03 ksi), weaker than 91% of ceramic grades. The elastic modulus is 10 GPa (1.45 Msi).
What is EG Carbon Brush used for?
- motor and generator brushes
- slip-ring contacts
- traction motors
Advantages
- Easy to machine — 95/100, better than 99% of ceramic grades
- Lightweight — 1.65 g/cm³ (0.0596 lb/in³), better than 95% of ceramic grades
Limitations
- Low stiffness — 10 GPa (1.45 Msi), worse than 93% of ceramic grades
- Hard to polish — 35/100, worse than 93% of ceramic grades
- Low fracture toughness — 1 MPa·√m (0.91 ksi·√in), worse than 84% of ceramic grades
- Limited service temperature — 350°C (662 °F), worse than 82% of ceramic grades
EG Carbon Brush properties
Typical room-temperature values; bars are the position among ceramic grades.
Physical3
EG Carbon Brush has a density of 1.65 g/cm³ (0.0596 lb/in³), lighter than 95% of ceramic grades. It melts at 3,650°C (6,602 °F).
Mechanical9
EG Carbon Brush has a tensile strength of 14 MPa (2.03 ksi), weaker than 91% of ceramic grades. The elastic modulus is 10 GPa (1.45 Msi).
Thermal5
EG Carbon Brush is rated for continuous service to 350°C (662 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 69% of ceramic grades. Thermal expansion is 4 µm/m·K (2.22 µin/in·°F).
Electrical2
EG Carbon Brush has an electrical resistivity of 4×10⁻⁵ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (85/100), better than 69% of ceramic grades.
Sustainability4
Producing a kilogram of EG Carbon Brush takes about 130 MJ of energy and emits 9 kg of CO₂ — more than 55% of ceramic grades. Typical recycled content is 5%.
Manufacturability3
EG Carbon Brush's machinability is excellent (95/100, better than 99% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. EG Carbon Brush is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EG Carbon Brush
Is EG Carbon Brush easy to machine?
Machines very easily dry with sharp carbide or PCD tooling — no coolant, but vacuum dust extraction and edge support are mandatory to avoid chipping.
Can EG Carbon Brush be welded?
Not weldable; brush shunts are attached by tamping copper stranded wire into a drilled hole with copper powder, or by soldering to a metallized pad.
Can EG Carbon Brush be formed, bent or molded?
Formed by mixing coke/pitch, pressing or extruding a green block, baking ~1000 °C, then graphitizing at 2500–2800 °C; final shape is ground/milled from stock, not net-shape formed.
EG Carbon Brush chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| ash (SiO2, Fe2O3, Al2O3 etc.)residual mineral ash after graphitization | 0.05 – 1 | 0.4 |
| impregnant (resin/oil)only in treated EG-I grades | 0 – 8 | 0 |
| Cgraphitized carbon from calcined petroleum coke / lampblack plus pitch binder | ≥ 98 (balance) |
What surface finishes work on EG Carbon Brush?
Bedded to the commutator with abrasive brush-seating stone; surfaces may be resin-impregnated, copper-plated at the top face, or sealed against dusting.
How much does EG Carbon Brush cost?
EG Carbon Brush is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
EG Carbon Brush — frequently asked
What is EG Carbon Brush used for?
EG Carbon Brush is typically used for motor and generator brushes, slip-ring contacts and traction motors. In short: best commutation at speed; low friction, low wear; higher resistance than metal-graphite.
What is the tensile strength of EG Carbon Brush?
EG Carbon Brush has a typical tensile strength of 14 MPa (2.03 ksi) — weaker than 91% of ceramic grades. Strength varies by condition: see the 2 listed tempers.
Is EG Carbon Brush easy to machine?
Yes — machinability is rated excellent (95/100, better than 99% of ceramic grades). Machines very easily dry with sharp carbide or PCD tooling — no coolant, but vacuum dust extraction and edge support are mandatory to avoid chipping.
Can EG Carbon Brush be welded?
Not weldable; brush shunts are attached by tamping copper stranded wire into a drilled hole with copper powder, or by soldering to a metallized pad.
What surface finishes work on EG Carbon Brush?
Bedded to the commutator with abrasive brush-seating stone; surfaces may be resin-impregnated, copper-plated at the top face, or sealed against dusting.
Can EG Carbon Brush be formed, bent or molded?
Formed by mixing coke/pitch, pressing or extruding a green block, baking ~1000 °C, then graphitizing at 2500–2800 °C; final shape is ground/milled from stock, not net-shape formed.
What is the maximum service temperature of EG Carbon Brush?
EG Carbon Brush is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does EG Carbon Brush cost?
EG Carbon Brush is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- JIS C 2802 Carbon brushes for electrical machines — JSA (2016)
- GB/T 1416 (Carbon brushes) — SAC (2019)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses (carbon/graphite section) — ASM International (1991)
- Electrographite brush grade data sheets — Mersen / Schunk / (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.