Natural Flake Graphite vs RP Graphite Electrode
Ceramic · grade comparison
Natural Flake Graphite and RP Graphite Electrode are both ceramic grades. Natural Flake Graphite is the stronger of the two: tensile strength 8 MPa (1.16 ksi) against 7 MPa (1.02 ksi) for RP Graphite Electrode, about 14% more. Natural Flake Graphite is the more ductile: elongation 0.3% versus 0.25% for RP Graphite Electrode, and RP Graphite Electrode is harder (32 HV vs 12 HV). RP Graphite Electrode is lighter (1.56 g/cm³ vs 2.24 g/cm³ for Natural Flake Graphite) and Natural Flake Graphite is stiffer (10 GPa vs 9 GPa). On the shop floor, Natural Flake Graphite sits in a lower cost tier (budget, $) than RP Graphite Electrode (standard, $$).
Natural Flake GraphiteChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
RP Graphite ElectrodeChoose it when weight is the constraint.
Natural Flake Graphite 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.
Natural Flake GraphiteRP Graphite Electrode
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Shear Strength 6 MPa0.87 ksi · 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)
Same in both: Specific Heat Capacity 710 J/kg·K0.17 BTU/lb·°F · Max Service Temperature (continuous) 450°C842 °F · Min Service Temperature -200°C-328 °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
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Strength (UTS / density) 4 kN·m/kg
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 | Natural Flake Graphite | RP Graphite Electrode |
|---|---|---|
| Default condition | — | — |
| Relative cost | $ Budget | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Natural Flake Graphite vs RP Graphite Electrode — frequently asked
Is Natural Flake Graphite stronger than RP Graphite Electrode?
Yes. Natural Flake Graphite has a typical tensile strength of 8 MPa (1.16 ksi) against 7 MPa (1.02 ksi) for RP Graphite Electrode — about 14% more.
Which is cheaper, Natural Flake Graphite or RP Graphite Electrode?
Natural Flake Graphite is the lower-cost material: it sits in the budget tier ($) while RP Graphite Electrode is standard ($$). 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, Natural Flake Graphite or RP Graphite Electrode?
RP Graphite Electrode, by a small margin. Both rate excellent for machinability — 90/100 against 85/100 for Natural Flake Graphite.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Natural Flake Graphite 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.