Cork Composition (Cork-Rubber) vs Natural Cork
Natural Material · grade comparison
Cork Composition (Cork-Rubber) and Natural Cork are both natural material grades. Cork Composition (Cork-Rubber) is the stronger of the two: tensile strength 2 MPa (0.305 ksi) against 1 MPa (0.16 ksi) for Natural Cork, about 91% more. Cork Composition (Cork-Rubber) is the more ductile: elongation 12% versus 7% for Natural Cork. Natural Cork is lighter (0.16 g/cm³ vs 0.75 g/cm³ for Cork Composition (Cork-Rubber)) and Cork Composition (Cork-Rubber) is stiffer (0.03 GPa vs 0.02 GPa).
Cork Composition (Cork-Rubber)Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Natural CorkChoose it when weight is the constraint.
Cork Composition (Cork-Rubber) vs Natural Cork: 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)Natural Cork
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
Shear Modulus
Bulk Modulus
Flexural 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)
Min Service Temperature
Same in both: Max Service Temperature (continuous) 120°C248 °F
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.
Polishability
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)
Specific Stiffness (E / density)
Thermal Diffusivity
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) | Natural Cork |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Cork Composition (Cork-Rubber) vs Natural Cork — frequently asked
Is Cork Composition (Cork-Rubber) stronger than Natural Cork?
Yes. Cork Composition (Cork-Rubber) has a typical tensile strength of 2 MPa (0.305 ksi) against 1 MPa (0.16 ksi) for Natural Cork — about 91% more.
Which is cheaper, Cork Composition (Cork-Rubber) or Natural Cork?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Cork Composition (Cork-Rubber) over Natural Cork?
Pick Cork Composition (Cork-Rubber) when strength drives the design, or when the part is bent, formed or impact-loaded. Pick Natural Cork when weight is the constraint.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cork Composition (Cork-Rubber) and Natural Cork 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.