C/C-SiC vs C/SiC
Composite · grade comparison
C/C-SiC and C/SiC are both composite grades. C/SiC is the stronger of the two: tensile strength 150 MPa (21.8 ksi) against 110 MPa (16 ksi) for C/C-SiC, about 36% more. C/C-SiC is lighter (1.95 g/cm³ vs 2.1 g/cm³ for C/SiC) and C/SiC is stiffer (65 GPa vs 60 GPa).
C/C-SiCChoose it when weight is the constraint.
C/SiCChoose it when strength drives the design.
C/C-SiC vs C/SiC: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite 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 composite 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
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Fracture Toughness (K_IC)
Same in both: Shear Modulus 25 GPa3.6 Msi · Elongation at Break 0.3% · Shear Strength 28 MPa4.1 ksi
Physical
Density and transition temperatures.
Density
Water Absorption (24 h)
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Max Service Temperature (short-term)
Same in both: Thermal Conductivity 20 W/m·K11.6 BTU/hr·ft·°F · Max Service Temperature (continuous) 1,350°C2,462 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
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 composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | C/C-SiC | C/SiC |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C/C-SiC vs C/SiC — frequently asked
Is C/SiC stronger than C/C-SiC?
Yes. C/SiC has a typical tensile strength of 150 MPa (21.8 ksi) against 110 MPa (16 ksi) for C/C-SiC — about 36% more.
Which is cheaper, C/C-SiC or C/SiC?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose C/C-SiC over C/SiC?
Pick C/C-SiC when weight is the constraint. Pick C/SiC when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C/C-SiC and C/SiC 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.