Robax NEOCERAM-N0
Grade
also Schott Robax, Stove Glass
Functionally interchangeable Asian-sourced transparent glass-ceramic; usually cheaper in China/Japan supply chains with slightly lower density and marginally negative CTE.
Values for the NEOCERAM-N0 condition
Other Robax tempers and conditions
Robax is listed in 2 conditions; see the grade overview at Robax.
- Annealed Glass
- NEOCERAM-N0
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed GlassDefault as-ceramized transparent Robax panel, no coating | Standard choice for fireplace and stove viewing windows, oven doors and furnace sight glasses where clear vision and thermal-shock resistance are needed. | — | 35 | 0 | 590 HV | 2 W/m·K |
NEOCERAM-N0This page transparent LAS glass-ceramic (Nippon Electric Glass equivalent) | Functionally interchangeable Asian-sourced transparent glass-ceramic; usually cheaper in China/Japan supply chains with slightly lower density and marginally negative CTE. | — | 45 | 0 | 620 HV | 2 W/m·K |
What is Robax NEOCERAM-N0?
Robax NEOCERAM-N0 is Robax in the NEOCERAM-N0 grade — functionally interchangeable Asian-sourced transparent glass-ceramic; usually cheaper in China/Japan supply chains with slightly lower density and marginally negative CTE. Robax NEOCERAM-N0 has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 0% and the elastic modulus is 88 GPa (12.8 Msi). Robax NEOCERAM-N0 has a density of 2.51 g/cm³ (0.0907 lb/in³), lighter than 70% of glass grades. Annealed Glass is the default condition FabDigit quotes; NEOCERAM-N0 is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 1 MPa·√m (0.91 ksi·√in), better than 87% of glass grades
- High service temperature — 700°C (1,292 °F), better than 76% of glass grades
Limitations
- Difficult to machine — 6/100, worse than 87% of glass grades
Robax NEOCERAM-N0 properties
Typical room-temperature values for Robax NEOCERAM-N0; 16 are specific to this condition. Other listed values are Robax reference data and may not represent this condition. Bars are the position among glass grades.
Physical4
Robax NEOCERAM-N0 has a density of 2.51 g/cm³ (0.0907 lb/in³), lighter than 70% of glass grades.
Mechanical13
Robax NEOCERAM-N0 has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 0% and the elastic modulus is 88 GPa (12.8 Msi).
Thermal5
Robax NEOCERAM-N0 is rated for continuous service to 700°C (1,292 °F). It conducts heat at 1.7 W/m·K (0.982 BTU/hr·ft·°F), better than 66% of glass grades. Thermal expansion is -0.2 µm/m·K (-0.111 µin/in·°F).
Electrical5
Robax NEOCERAM-N0 is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹¹ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (85/100), better than 65% of glass grades.
Sustainability4
Producing a kilogram of Robax NEOCERAM-N0 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — less than 79% of glass grades. Typical recycled content is 0%.
Manufacturability3
Robax NEOCERAM-N0's machinability is not recommended (6/100, worse than 87% of glass grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Robax NEOCERAM-N0
Is Robax easy to machine?
Diamond grinding, water-jet or CO2/fiber laser cutting only; no scoring-and-snapping like soda-lime, and edges must be seamed/ground to remove flaws.
Can Robax be welded?
Not weldable; joined mechanically with gaskets or with high-temperature silicone/ceramic adhesives and rope seals.
Can Robax be formed, bent or molded?
Supplied as flat or roller-formed curved panels ceramized at the factory; end users cannot re-form or temper it — near-zero CTE means it is not (and need not be) thermally toughened.
What surface finishes work on Robax?
Screen-printed ceramic decoration, anti-reflective or IR-reflective sputtered coatings, and fine polishing are all possible; avoid HF-based cleaners and abrasive pads on coated faces.
Robax chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Al2O3 | 17 – 21 | 19 |
| Li2Oforms β-quartz solid solution → near-zero CTE | 3 – 4.5 | 3.7 |
| MgO | 0.5 – 2 | 1 |
| ZnO | 0.5 – 2.5 | 1.5 |
| TiO2nucleating agent | 1.5 – 3 | 2.3 |
| ZrO2nucleating agent | 1 – 2.5 | 1.8 |
| Na2O+K2Oresidual alkalis | 0.2 – 1.5 | 0.8 |
| BaO | 0 – 2 | 0.8 |
| fining agents (SnO2/As2O3-free modern ba | 0 – 1 | 0.3 |
| SiO2network former | ≥ 63 (balance) | — |
Robax NEOCERAM-N0 — frequently asked
What is Robax NEOCERAM-N0 used for?
Robax NEOCERAM-N0 is typically used for fireplace and stove door panels, cooktop panels, wood and pellet stove viewing windows, furnace and kiln sight glasses, commercial and pizza oven windows and gas fire viewing panels. In short: transparent fireproof ceramic.
What is the tensile strength of Robax NEOCERAM-N0?
Robax NEOCERAM-N0 has a typical tensile strength of 45 MPa (6.53 ksi) — weaker than 56% of glass grades. Strength varies by condition: see the 2 listed tempers.
Is Robax NEOCERAM-N0 easy to machine?
Not especially — machinability is rated not recommended (6/100, worse than 87% of glass grades). Diamond grinding, water-jet or CO2/fiber laser cutting only; no scoring-and-snapping like soda-lime, and edges must be seamed/ground to remove flaws.
Can Robax NEOCERAM-N0 be welded?
Not weldable; joined mechanically with gaskets or with high-temperature silicone/ceramic adhesives and rope seals.
What surface finishes work on Robax NEOCERAM-N0?
Screen-printed ceramic decoration, anti-reflective or IR-reflective sputtered coatings, and fine polishing are all possible; avoid HF-based cleaners and abrasive pads on coated faces.
Can Robax NEOCERAM-N0 be formed, bent or molded?
Supplied as flat or roller-formed curved panels ceramized at the factory; end users cannot re-form or temper it — near-zero CTE means it is not (and need not be) thermally toughened.
What is the maximum service temperature of Robax NEOCERAM-N0?
Robax NEOCERAM-N0 is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ROBAX transparent glass-ceramic — technical data — SCHOTT AG (2023)
- NEOCERAM N-0 / N-11 glass-ceramic data sheet — Nippon Electric Glass (2021)
- ASM Engineered Materials Handbook Vol. 4 — Ceramics and Glasses (glass-ceramics chapter) — ASM International (1991)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.