3240 vs FR-2
Composite · grade comparison
3240 and FR-2 are both composite grades. 3240 is the stronger of the two: tensile strength 300 MPa (43.5 ksi) against 92 MPa (13.3 ksi) for FR-2, about 3.3 times as much. 3240 is the more ductile: elongation 1.8% versus 1.1% for FR-2. FR-2 is lighter (1.55 g/cm³ vs 1.9 g/cm³ for 3240) and 3240 is stiffer (21 GPa vs 7.5 GPa). On the shop floor, FR-2 machines more easily (very good vs fair) and FR-2 sits in a lower cost tier (standard, $$) than 3240 (premium, $$$).
3240Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
FR-2Choose it when weight is the constraint, or when the part is machined in volume.
3240 vs FR-2: 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
Shear Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Izod Impact, Notched
Hardness, Rockwell M
Fracture Toughness (K_IC)
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Limiting Oxygen Index
Max Service Temperature (short-term)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Thermal Conductivity 0.35 W/m·K0.2 BTU/hr·ft·°F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Volume Resistivity
Surface Resistivity
Comparative Tracking Index (CTI)
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)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Same in both: Thermal Diffusivity 0.2 mm²/s · Thermal Shock Resistance Index 0
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 | 3240 | FR-2 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
3240 vs FR-2 — frequently asked
Is 3240 stronger than FR-2?
Yes. 3240 has a typical tensile strength of 300 MPa (43.5 ksi) against 92 MPa (13.3 ksi) for FR-2 — about 3.3 times as much.
Which is cheaper, 3240 or FR-2?
FR-2 is the lower-cost material: it sits in the standard tier ($$) while 3240 is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, 3240 or FR-2?
FR-2. Its machinability rates very good (75/100) against fair (45/100) for 3240.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 3240 and FR-2 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.