High Hardness Ceramic · Oxide Ceramic
Alumina 99.5
Alumina 99.5 is a high hardness ceramic ceramic — premium high-purity alumina. Typical values: 380 MPa yield, 3.89 g/cm³, rated to 1,700 °C. Available for CNC machining at FabDigit.
Properties
Typical room-temperature values for the default supply condition. Metric first, imperial in gray. The bars show where Alumina 99.5 sits against the other 11 ceramic grades in the catalog.
Datasheet
| Yield strength | 380 MPa55 ksi |
|---|---|
| Tensile strength | 410 MPa59 ksi |
| Hardness | 1500 HV≈ 1425 HB |
| Density | 3.89 g/cm³0.141 lb/in³ |
| Specific strength (yield ÷ density) | 98 |
| Min service temp | -200 °C-328 °F |
| Max service temp | 1,700 °C3,092 °F |
| Electrical conductivity | < 0.001 % IACSinsulator |
| Machinability | Poor20 / 100 |
| Weldability | Not recommended5 / 100 |
| Formability | Not recommended5 / 100 |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other ceramic grades
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. Alumina 99.5 is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to Alumina 99.5. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Poor20 / 100 |
|---|---|
| Cutting speed (rough / finish) | — / — |
| Minimum wall | — |
| Minimum internal radius | — |
| Drill depth limit | — |
| Best surface (machined / polished) | Ra — / — |
| Hardenable after machining | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on Alumina 99.5, ranked by how often they make sense for this grade.
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| CMM Inspection | Inspection |
| FAI Report | Inspection |
| Individual Bag | Packaging |
Surface finishes for Alumina 99.5
Coatings and treatments compatible with ceramic on the processes Alumina 99.5 runs on. Pick them in the quote configurator or call them out on the drawing.
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Vibro Engraving / Scribing
Equivalent designations
Standards and trade names that resolve to Alumina 99.5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- High Purity Alumina
- Other
- Al2O3 99.5%
Stock forms
Raw-material forms FabDigit sources Alumina 99.5 in.
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.