Cork Composition (Cork-Rubber) vs SAE F-3 Wool Felt
Natural Material · grade comparison
Cork Composition (Cork-Rubber) and SAE F-3 Wool Felt are both natural material grades. Cork Composition (Cork-Rubber) is the stronger of the two: tensile strength 2 MPa (0.305 ksi) against 2 MPa (0.247 ksi) for SAE F-3 Wool Felt, about 24% more. In exchange, SAE F-3 Wool Felt is the more ductile: elongation 40% versus 12% for Cork Composition (Cork-Rubber). SAE F-3 Wool Felt is lighter (0.3 g/cm³ vs 0.75 g/cm³ for Cork Composition (Cork-Rubber)) and Cork Composition (Cork-Rubber) is stiffer (0.03 GPa vs 0.01 GPa). On the shop floor, Cork Composition (Cork-Rubber) sits in a lower cost tier (premium, $$$) than SAE F-3 Wool Felt (high, $$$$).
Cork Composition (Cork-Rubber)Choose it when strength drives the design, or when the part sees heat.
SAE F-3 Wool FeltChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Cork Composition (Cork-Rubber) vs SAE F-3 Wool Felt: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all natural material 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 natural material 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.
Cork Composition (Cork-Rubber)SAE F-3 Wool Felt
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Shear Strength
Physical
Density and transition temperatures.
Density
Porosity
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
Dielectric Strength
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.
Same in both: Machinability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Same in both: Specific Stiffness (E / density) 0 MN·m/kg · Thermal Diffusivity 0.1 mm²/s
Strength versus weight
Yield strength against density for every natural material grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Cork Composition (Cork-Rubber) | SAE F-3 Wool Felt |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Cork Composition (Cork-Rubber) vs SAE F-3 Wool Felt — frequently asked
Is Cork Composition (Cork-Rubber) stronger than SAE F-3 Wool Felt?
Yes. Cork Composition (Cork-Rubber) has a typical tensile strength of 2 MPa (0.305 ksi) against 2 MPa (0.247 ksi) for SAE F-3 Wool Felt — about 24% more.
Which is cheaper, Cork Composition (Cork-Rubber) or SAE F-3 Wool Felt?
Cork Composition (Cork-Rubber) is the lower-cost material: it sits in the premium tier ($$$) while SAE F-3 Wool Felt is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
When should I choose Cork Composition (Cork-Rubber) over SAE F-3 Wool Felt?
Pick Cork Composition (Cork-Rubber) when strength drives the design, or when the part sees heat. Pick SAE F-3 Wool Felt when the part is bent, formed or impact-loaded, or when weight is the constraint.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cork Composition (Cork-Rubber) and SAE F-3 Wool Felt 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.