Impervious Graphite vs MG Carbon Brush
Ceramic · grade comparison
Impervious Graphite and MG Carbon Brush are both ceramic grades. Impervious Graphite is the stronger of the two: tensile strength 25 MPa (3.63 ksi) against 20 MPa (2.9 ksi) for MG Carbon Brush, about 25% more. Impervious Graphite is harder — 50 HV against 12 HV for MG Carbon Brush — which matters for wear surfaces and threads. Impervious Graphite is lighter (1.8 g/cm³ vs 3.6 g/cm³ for MG Carbon Brush) and MG Carbon Brush is stiffer (13 GPa vs 12 GPa).
Impervious GraphiteChoose it when strength drives the design, or when surface hardness matters.
MG Carbon BrushChoose it when the part sees heat.
Impervious Graphite vs MG Carbon Brush: 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.
Impervious GraphiteMG Carbon Brush
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Mohs
Physical
Density and transition temperatures.
Density
Porosity
Melting Point (Solidus)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Same in both: Min Service Temperature -50°C-58 °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)
Typical Recycled Content
Embodied Water
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 | Impervious Graphite | MG Carbon Brush |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Impervious Graphite vs MG Carbon Brush — frequently asked
Is Impervious Graphite stronger than MG Carbon Brush?
Yes. Impervious Graphite has a typical tensile strength of 25 MPa (3.63 ksi) against 20 MPa (2.9 ksi) for MG Carbon Brush — about 25% more.
Which is cheaper, Impervious Graphite or MG Carbon Brush?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Impervious Graphite or MG Carbon Brush?
MG Carbon Brush. Its machinability rates excellent (85/100) against very good (80/100) for Impervious Graphite.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Impervious Graphite and MG Carbon Brush 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.