B4C vs HPSiC
Ceramic · grade comparison
B4C and HPSiC are both ceramic grades. HPSiC is the stronger of the two: tensile strength 350 MPa (50.8 ksi) against 300 MPa (43.5 ksi) for B4C, about 17% more. B4C is harder — 3,000 HV against 2,600 HV for HPSiC — which matters for wear surfaces and threads. B4C is lighter (2.51 g/cm³ vs 3.2 g/cm³ for HPSiC) and HPSiC runs hotter in service (1,600°C vs 800°C continuous).
B4CChoose it when surface hardness matters, or when weight is the constraint.
HPSiCChoose it when strength drives the design, or when the part sees heat.
B4C vs HPSiC: 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.
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Elastic (Young's) Modulus 450 GPa65.3 Msi · Hardness, Mohs 9.5
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Same in both: Porosity 0.5%
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
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.
Polishability
Sintering / Firing Temperature
Same in both: Machinability 3 / 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 | B4C | HPSiC |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
B4C vs HPSiC — frequently asked
Is HPSiC stronger than B4C?
Yes. HPSiC has a typical tensile strength of 350 MPa (50.8 ksi) against 300 MPa (43.5 ksi) for B4C — about 17% more.
Which is cheaper, B4C or HPSiC?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose B4C over HPSiC?
Pick B4C when surface hardness matters, or when weight is the constraint. Pick HPSiC when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in B4C and HPSiC 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.