Electrical Porcelain vs Mullite
Ceramic · grade comparison
Electrical Porcelain and Mullite are both ceramic grades. Mullite is the stronger of the two: tensile strength 80 MPa (11.6 ksi) against 30 MPa (4.35 ksi) for Electrical Porcelain, about 167% more. Mullite is harder — 1,100 HV against 620 HV for Electrical Porcelain — which matters for wear surfaces and threads. Electrical Porcelain is lighter (2.35 g/cm³ vs 2.9 g/cm³ for Mullite) and Mullite is stiffer (150 GPa vs 70 GPa). On the shop floor, Electrical Porcelain sits in a lower cost tier (standard, $$) than Mullite (premium, $$$).
Electrical PorcelainChoose it when weight is the constraint, or when cost is the deciding factor.
MulliteChoose it when strength drives the design, or when surface hardness matters.
Electrical Porcelain vs Mullite: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Hardness, Mohs
Shear Strength
Same in both: Elongation at Break 0%
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Porosity
Refractive Index
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)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dissipation Factor (1 MHz)
Volume Resistivity
Same in both: Dielectric Constant (1 MHz) 6.5
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 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 | Electrical Porcelain | Mullite |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Electrical Porcelain vs Mullite — frequently asked
Is Mullite stronger than Electrical Porcelain?
Yes. Mullite has a typical tensile strength of 80 MPa (11.6 ksi) against 30 MPa (4.35 ksi) for Electrical Porcelain — about 167% more.
Which is cheaper, Electrical Porcelain or Mullite?
Electrical Porcelain is the lower-cost material: it sits in the standard tier ($$) while Mullite is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
When should I choose Electrical Porcelain over Mullite?
Pick Electrical Porcelain when weight is the constraint, or when cost is the deciding factor. Pick Mullite when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Electrical Porcelain and Mullite 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.