OK3/BK3 vs YG8
Ceramic · grade comparison
OK3/BK3 and YG8 are both ceramic grades. YG8 is the stronger of the two: tensile strength 1,200 MPa (174 ksi) against 1,100 MPa (160 ksi) for OK3/BK3, about 9% more. YG8 is the more ductile: elongation 0.1% versus 0% for OK3/BK3, and OK3/BK3 is harder (1,500 HV vs 1,350 HV). OK3/BK3 is stiffer (650 GPa vs 600 GPa) and OK3/BK3 runs hotter in service (800°C vs 600°C continuous).
OK3/BK3Choose it when the part sees heat.
YG8Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
OK3/BK3 vs YG8: 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
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Hardness, Mohs 9
Physical
Density and transition temperatures.
Density
Porosity
Same in both: Melting Point (Solidus) 1,320°C2,408 °F
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)
Same in both: Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Volume Resistivity
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
Sintering / Firing Temperature
Same in both: Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 30%
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 | OK3/BK3 | YG8 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
OK3/BK3 vs YG8 — frequently asked
Is YG8 stronger than OK3/BK3?
Yes. YG8 has a typical tensile strength of 1,200 MPa (174 ksi) against 1,100 MPa (160 ksi) for OK3/BK3 — about 9% more.
Which is cheaper, OK3/BK3 or YG8?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose OK3/BK3 over YG8?
Pick OK3/BK3 when the part sees heat. Pick YG8 when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in OK3/BK3 and YG8 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.