EG Carbon Brush vs RP Graphite Electrode
Ceramic · grade comparison
EG Carbon Brush and RP Graphite Electrode are both ceramic grades. EG Carbon Brush is the stronger of the two: tensile strength 14 MPa (2.03 ksi) against 7 MPa (1.02 ksi) for RP Graphite Electrode, about 100% more. RP Graphite Electrode is lighter (1.56 g/cm³ vs 1.65 g/cm³ for EG Carbon Brush) and EG Carbon Brush is stiffer (10 GPa vs 9 GPa). On the shop floor, RP Graphite Electrode sits in a lower cost tier (standard, $$) than EG Carbon Brush (high, $$$$).
EG Carbon BrushChoose it when strength drives the design.
RP Graphite ElectrodeChoose it when weight is the constraint, or when the part sees heat.
EG Carbon Brush vs RP Graphite Electrode: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
EG Carbon BrushRP Graphite Electrode
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Shear Strength
Elongation at Break
Hardness, Vickers
Same in both: Fracture Toughness (K_IC) 1 MPa·√m0.91 ksi·√in · Hardness, Mohs 1.5
Physical
Density and transition temperatures.
Density
Porosity
Same in both: Melting Point (Solidus) 3,650°C6,602 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 710 J/kg·K0.17 BTU/lb·°F
Electrical
Conductivity and insulation.
Electrical Resistivity
Volume Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Sintering / Firing Temperature
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 5%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every ceramic grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | EG Carbon Brush | RP Graphite Electrode |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
EG Carbon Brush vs RP Graphite Electrode — frequently asked
Is EG Carbon Brush stronger than RP Graphite Electrode?
Yes. EG Carbon Brush has a typical tensile strength of 14 MPa (2.03 ksi) against 7 MPa (1.02 ksi) for RP Graphite Electrode — about 100% more.
Which is cheaper, EG Carbon Brush or RP Graphite Electrode?
RP Graphite Electrode is the lower-cost material: it sits in the standard tier ($$) while EG Carbon Brush is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, EG Carbon Brush or RP Graphite Electrode?
EG Carbon Brush, by a small margin. Both rate excellent for machinability — 95/100 against 90/100 for RP Graphite Electrode.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EG Carbon Brush and RP Graphite Electrode side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.