Mullite/Mullite vs Ox/Ox
Composite · grade comparison
Mullite/Mullite and Ox/Ox are both composite grades. Ox/Ox is the stronger of the two: tensile strength 190 MPa (27.6 ksi) against 130 MPa (18.9 ksi) for Mullite/Mullite, about 46% more. In exchange, Mullite/Mullite is the more ductile: elongation 0.35% versus 0.3% for Ox/Ox. Ox/Ox is stiffer (75 GPa vs 70 GPa).
Mullite/MulliteChoose it when the part is bent, formed or impact-loaded.
Ox/OxChoose it when strength drives the design.
Mullite/Mullite vs Ox/Ox: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite 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 composite 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
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Same in both: Shear Modulus 25 GPa3.6 Msi · Flexural Modulus 65 GPa9.4 Msi
Physical
Density and transition temperatures.
Density
Water Absorption (24 h)
Water Absorption (Saturation)
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Same in both: Thermal Conductivity 2 W/m·K1.2 BTU/hr·ft·°F · Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Max Service Temperature (continuous) 1,200°C2,192 °F · Min Service Temperature -200°C-328 °F · Max Service Temperature (short-term) 1,300°C2,372 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dissipation Factor (1 MHz)
Volume Resistivity
Same in both: Electrical Resistivity 1×10¹⁰ Ω·m3.94×10¹⁷ µΩ·in · Dielectric Constant (1 MHz) 5
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 100 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Polishability
Same in both: Machinability 15 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Same in both: Thermal Diffusivity 0.7 mm²/s · Thermal Shock Resistance Index 1
Strength versus weight
Yield strength against density for every composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Mullite/Mullite | Ox/Ox |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Mullite/Mullite vs Ox/Ox — frequently asked
Is Ox/Ox stronger than Mullite/Mullite?
Yes. Ox/Ox has a typical tensile strength of 190 MPa (27.6 ksi) against 130 MPa (18.9 ksi) for Mullite/Mullite — about 46% more.
Which is cheaper, Mullite/Mullite or Ox/Ox?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Mullite/Mullite over Ox/Ox?
Pick Mullite/Mullite when the part is bent, formed or impact-loaded. Pick Ox/Ox when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Mullite/Mullite and Ox/Ox 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.