Ceran vs Robax
Glass · grade comparison
Ceran and Robax are both glass grades. Robax is the stronger of the two: tensile strength 35 MPa (5.08 ksi) against 30 MPa (4.35 ksi) for Ceran, about 17% more. Ceran is harder — 640 HV against 590 HV for Robax — which matters for wear surfaces and threads. On the shop floor, Robax sits in a lower cost tier (standard, $$) than Ceran (high, $$$$).
CeranChoose it when surface hardness matters.
RobaxChoose it when strength drives the design, or when cost is the deciding factor.
Ceran vs Robax: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all glass 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 glass 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.
Tensile Strength (Ultimate)
Flexural Strength
Hardness, Vickers
Hardness, Knoop
Elongation at Break
Shear Strength
Same in both: Elastic (Young's) Modulus 92 GPa13.3 Msi · Shear Modulus 37 GPa5.4 Msi · Bulk Modulus 59 GPa8.6 Msi · Poisson's Ratio 0.24 · Compressive Strength 500 MPa72.5 ksi · Fracture Toughness (K_IC) 0.9 MPa·√m0.82 ksi·√in · Hardness, Mohs 6.5
Physical
Density and transition temperatures.
Light Transmission
Same in both: Density 2.55 g/cm³0.09 lb/in³ · Refractive Index 1.54 · Porosity 0%
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Same in both: Thermal Conductivity 1.6 W/m·K0.92 BTU/hr·ft·°F · Thermal Expansion (CTE, 20–100 °C) 0.1 µm/m·K0.06 µin/in·°F · Max Service Temperature (continuous) 700°C1,292 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in · Dielectric Strength 25 kV/mm635 V/mil · Dielectric Constant (1 MHz) 7 · Dissipation Factor (1 MHz) 0.003 · Volume Resistivity 1×10¹³ Ω·cm
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 Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Water 20 L/kg2.4 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 36.1 MN·m/kg · Thermal Diffusivity 0.8 mm²/s
Strength versus weight
Yield strength against density for every glass grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Ceran | Robax |
|---|---|---|
| Default condition | — | Annealed Glass |
| Relative cost | $$$$ High | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Ceran vs Robax — frequently asked
Is Robax stronger than Ceran?
Yes. Robax has a typical tensile strength of 35 MPa (5.08 ksi) against 30 MPa (4.35 ksi) for Ceran — about 17% more.
Which is cheaper, Ceran or Robax?
Robax is the lower-cost material: it sits in the standard tier ($$) while Ceran is high ($$$$). 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, Ceran or Robax?
Ceran, by a small margin. Both rate not recommended for machinability — 12/100 against 6/100 for Robax.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ceran and Robax 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.