8Y-FSZ vs Alumina 99.5
Ceramic · grade comparison
8Y-FSZ and Alumina 99.5 are both ceramic grades. Alumina 99.5 is the stronger of the two: tensile strength 260 MPa (37.7 ksi) against 150 MPa (21.8 ksi) for 8Y-FSZ, about 73% more. Alumina 99.5 is harder — 1,650 HV against 1,300 HV for 8Y-FSZ — which matters for wear surfaces and threads. Alumina 99.5 is lighter (3.9 g/cm³ vs 5.95 g/cm³ for 8Y-FSZ) and Alumina 99.5 is stiffer (372 GPa vs 200 GPa).
Alumina 99.5Choose it when strength drives the design, or when surface hardness matters.
8Y-FSZ vs Alumina 99.5: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Hardness, Mohs
Shear Strength
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)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Constant (1 MHz)
Volume Resistivity
Dielectric Strength
Dissipation Factor (1 MHz)
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.
Sintering / Firing Temperature
Same in both: Machinability 5 / 100 · Polishability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
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 | 8Y-FSZ | Alumina 99.5 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
8Y-FSZ vs Alumina 99.5 — frequently asked
Is Alumina 99.5 stronger than 8Y-FSZ?
Yes. Alumina 99.5 has a typical tensile strength of 260 MPa (37.7 ksi) against 150 MPa (21.8 ksi) for 8Y-FSZ — about 73% more.
Which is cheaper, 8Y-FSZ or Alumina 99.5?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose 8Y-FSZ over Alumina 99.5?
Pick Alumina 99.5 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8Y-FSZ and Alumina 99.5 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.