Alumina 99.5 HIPed vs Alumina 99.5 Sintered
Ceramic · Alumina 99.5 temper comparison
Alumina 99.5 HIPed and Alumina 99.5 Sintered are two conditions of the same ceramic grade, Alumina 99.5: HIPed (hot isostatic pressed) versus Sintered. The chemistry is identical, so every difference below comes from the condition. Alumina 99.5 HIPed is the stronger of the two: tensile strength 320 MPa (46.4 ksi) against 260 MPa (37.7 ksi) for Alumina 99.5 Sintered, about 23% more. Alumina 99.5 HIPed is harder — 1,900 HV against 1,650 HV for Alumina 99.5 Sintered — which matters for wear surfaces and threads.
Alumina 99.5 HIPedChoose it when strength drives the design, or when surface hardness matters.
Alumina 99.5 HIPed vs Alumina 99.5 Sintered: 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.
Alumina 99.5 HIPedAlumina 99.5 Sintered
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Shear Modulus 152 GPa22 Msi · Bulk Modulus 228 GPa33.1 Msi · Poisson's Ratio 0.22 · Shear Strength 330 MPa47.9 ksi · Hardness, Knoop 1,440 HK · Hardness, Mohs 9
Physical
Density and transition temperatures.
Density
Porosity
Same in both: Melting Point (Solidus) 2,050°C3,722 °F · Refractive Index 1.76
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 880 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 7 µm/m·K3.9 µin/in·°F · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Dielectric Strength 17 kV/mm432 V/mil · Dielectric Constant (1 MHz) 9.8 · Dissipation Factor (1 MHz) 2×10⁻⁴ · Volume Resistivity 1×10¹⁵ 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 1,650°C3,002 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 0%
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.
Alumina 99.5 HIPed vs Alumina 99.5 Sintered — frequently asked
Is Alumina 99.5 HIPed stronger than Alumina 99.5 Sintered?
Yes. Alumina 99.5 HIPed has a typical tensile strength of 320 MPa (46.4 ksi) against 260 MPa (37.7 ksi) for Alumina 99.5 Sintered — about 23% more.
Which condition does FabDigit quote by default, HIPed or Sintered?
Sintered is the default Alumina 99.5 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose Alumina 99.5 HIPed over Alumina 99.5 Sintered?
Pick Alumina 99.5 HIPed when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alumina 99.5 HIPed and Alumina 99.5 Sintered 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.