OK3/BK3 vs YG8C
Ceramic · grade comparison
OK3/BK3 and YG8C are both ceramic grades. OK3/BK3 is harder — 1,500 HV against 1,220 HV for YG8C — which matters for wear surfaces and threads. 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 surface hardness matters, or when the part sees heat.
OK3/BK3 vs YG8C: 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
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Tensile Strength (Ultimate) 1,100 MPa160 ksi · Elongation at Break 0% · Hardness, Mohs 9
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,320°C2,408 °F · Porosity 0.04%
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 Water
Same in both: Embodied Energy (primary production) 320 MJ/kg137,575 BTU/lb · Embodied Carbon (primary production) 25 kg CO₂/kg · 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 | YG8C |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
OK3/BK3 vs YG8C — frequently asked
What is the difference between OK3/BK3 and YG8C?
OK3/BK3 and YG8C are both ceramic grades. OK3/BK3 is harder — 1,500 HV against 1,220 HV for YG8C — which matters for wear surfaces and threads. OK3/BK3 is stiffer (650 GPa vs 600 GPa) and OK3/BK3 runs hotter in service (800°C vs 600°C continuous).
Which is cheaper, OK3/BK3 or YG8C?
Both sit in the same relative cost tier ($$$$, 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 YG8C?
Pick OK3/BK3 when surface hardness matters, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in OK3/BK3 and YG8C 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.