Cork Composite Core CR vs Cork Composite Core FR
Composite · Cork Composite Core grade comparison
Cork Composite Core CR and Cork Composite Core FR are two grades of the same composite grade, Cork Composite Core: CR (cold rolled) versus FR (fire-retardant treated core for rail/marine interiors). The chemistry is identical, so every difference below comes from the condition. Cork Composite Core CR is the stronger of the two: tensile strength 2 MPa (0.29 ksi) against 0.75 MPa (0.109 ksi) for Cork Composite Core FR, about 167% more. Cork Composite Core CR is the more ductile: elongation 18% versus 9% for Cork Composite Core FR. Cork Composite Core FR is lighter (0.2 g/cm³ vs 0.75 g/cm³ for Cork Composite Core CR) and Cork Composite Core FR is stiffer (0.02 GPa vs 0.02 GPa).
Cork Composite Core CRChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Cork Composite Core FRChoose it when weight is the constraint, or when the part sees heat.
Cork Composite Core CR vs Cork Composite Core FR: 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.
Cork Composite Core CRCork Composite Core FR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Shear Strength
Compression Set (22 h, 70 °C)
Same in both: Shear Modulus 0.01 GPa8.7×10⁻⁴ Msi · Poisson's Ratio 0.1 · Compressive Modulus 0.02 GPa0 Msi
Physical
Density and transition temperatures.
Density
Same in both: Water Absorption (24 h) 6% · Water Absorption (Saturation) 15%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,700 J/kg·K0.41 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 50 µm/m·K27.8 µin/in·°F · Min Service Temperature -60°C-76 °F · Max Service Temperature (short-term) 150°C302 °F
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 6 MJ/kg2,580 BTU/lb · Embodied Carbon (primary production) 0.5 kg CO₂/kg · Typical Recycled Content 90%
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.
Cork Composite Core CR vs Cork Composite Core FR — frequently asked
Is Cork Composite Core CR stronger than Cork Composite Core FR?
Yes. Cork Composite Core CR has a typical tensile strength of 2 MPa (0.29 ksi) against 0.75 MPa (0.109 ksi) for Cork Composite Core FR — about 167% more.
Which grade does FabDigit quote by default, CR or FR?
NL20 is the default Cork Composite Core condition in the FabDigit quote flow (neither CR nor FR). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose Cork Composite Core CR over Cork Composite Core FR?
Pick Cork Composite Core CR when strength drives the design, or when the part is bent, formed or impact-loaded. Pick Cork Composite Core FR when weight is the constraint, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cork Composite Core CR and Cork Composite Core FR 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.