Mullite vs Zircon
Ceramic · grade comparison
Mullite and Zircon are both ceramic grades. Mullite is lighter (2.9 g/cm³ vs 3.7 g/cm³ for Zircon) and Zircon is stiffer (190 GPa vs 150 GPa). On the shop floor, Zircon sits in a lower cost tier (standard, $$) than Mullite (premium, $$$).
MulliteChoose it when weight is the constraint.
ZirconChoose it when cost is the deciding factor.
Mullite vs Zircon: 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
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Poisson's Ratio 0.25 · Tensile Strength (Ultimate) 80 MPa11.6 ksi · Hardness, Mohs 7.5
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Refractive Index
Porosity
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 -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Volume Resistivity
Same in both: Dielectric Strength 12 kV/mm305 V/mil
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.
Polishability
Sintering / Firing Temperature
Same in both: Machinability 5 / 100
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 | Mullite | Zircon |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Mullite vs Zircon — frequently asked
What is the difference between Mullite and Zircon?
Mullite and Zircon are both ceramic grades. Mullite is lighter (2.9 g/cm³ vs 3.7 g/cm³ for Zircon) and Zircon is stiffer (190 GPa vs 150 GPa). On the shop floor, Zircon sits in a lower cost tier (standard, $$) than Mullite (premium, $$$).
Which is cheaper, Mullite or Zircon?
Zircon 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 Mullite over Zircon?
Pick Mullite when weight is the constraint. Pick Zircon when cost is the deciding factor.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Mullite and Zircon 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.