Neoceram vs Robax
Glass · grade comparison
Neoceram and Robax are both glass grades. Neoceram is the stronger of the two: tensile strength 50 MPa (7.25 ksi) against 35 MPa (5.08 ksi) for Robax, about 43% more. Neoceram is harder — 700 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, $$) than Neoceram (high, $$$$).
NeoceramChoose it when strength drives the design, or when surface hardness matters.
RobaxChoose it when cost is the deciding factor.
Neoceram 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.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Hardness, Vickers
Hardness, Knoop
Shear Strength
Same in both: Poisson's Ratio 0.24 · Elongation at Break 0% · Fracture Toughness (K_IC) 0.9 MPa·√m0.82 ksi·√in · Hardness, Mohs 6.5
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Light Transmission
Same in both: Refractive Index 1.54 · Porosity 0%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Same in both: Max Service Temperature (continuous) 700°C1,292 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Same in both: Electrical Resistivity 1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in · 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
Same in both: Sintering / Firing Temperature 900°C1,652 °F
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)
Specific Stiffness (E / density)
Thermal Shock Resistance Index
Same in both: 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 | Neoceram | Robax |
|---|---|---|
| Default condition | — | Annealed Glass |
| Relative cost | $$$$ High | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Neoceram vs Robax — frequently asked
Is Neoceram stronger than Robax?
Yes. Neoceram has a typical tensile strength of 50 MPa (7.25 ksi) against 35 MPa (5.08 ksi) for Robax — about 43% more.
Which is cheaper, Neoceram or Robax?
Robax is the lower-cost material: it sits in the standard tier ($$) while Neoceram is high ($$$$). 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 Neoceram over Robax?
Pick Neoceram when strength drives the design, or when surface hardness matters. Pick Robax when cost is the deciding factor.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Neoceram 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.