Materials / Compare
Aluminum A380 vs. PCB Laminate FR-4
Compare Aluminum A380 vs. PCB Laminate FR-4 strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 160MPasourcetypical, 25 °C | not given (tensile used) |
| Ultimate tensile strength | 320MPasourcetypical, 25 °C | 246–385MPasourcetypical, in-plane: cross direction .. length direction (ASTM D3039) |
| Flexural strength | not sourced | 531–621MPasourcetypical: cross direction .. length direction (IPC-TM-650 2.4.4B) |
| Elongation at break | 3.5%sourcetypical | not sourced |
| Young's modulus (stiffness) | 71GPasourcetypical, 25 °C | 21.9–25.8GPasourcetypical, in-plane: cross direction .. length direction (ASTM D790-15e2) |
| Density | 2,713kg/m³sourcetypical at 68 °F | 1,920kg/m³sourcetypical, 50% resin content; another FR-4 producer: Park Nelco N4000-6 (high-Tg multifunctional epoxy), not Isola 370HR |
| Strength to weight | 59kN·m/kg | 164kN·m/kg2.79x higher |
| Stiffness to weight | 26.2MN·m/kg2.11x higher | 12.4MN·m/kg |
| Poisson's ratio | not sourced | 0.171–0.177sourcetypical, in-plane: cross direction .. length direction |
| Shear modulus | not sourced | 10.2GPa |
| Bulk modulus | not sourced | 12.2GPa |
| Speed of sound | 5,116m/s | 3,525m/s |
| Thermal | ||
| Thermal conductivity | 96.2W/m·Ksourcetypical at 68 °F | 0.4W/m·Ksourcetypical (ASTM E1952); direction not stated by the sheet |
| Thermal expansion | 21.8µm/m·Ksourcetypical, 68-572 °F (20-300 °C) | 13–14µm/m·Ksourcetypical, in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C) |
| 100 mm part over a 50 °C swing | 109µm growth | 67.5µm growth1.61x less |
| Specific heat | 963J/kg·Ksourcetypical at 68 °F | 1,200–1,400J/kg·Ksourcetypical (ASTM E1461); another FR-4 producer: Park Nelco N4000-6 (high-Tg multifunctional epoxy), not Isola 370HR |
| Heats up and cools (diffusivity) | 36.8mm²/s230x faster | 0.16mm²/s |
| Thermal shock resistance | not sourced | 324W/m |
| Glass transition | not sourced | 180°Csourcetypical, DSC (IPC-TM-650 2.4.25C) |
| Max service temperature | not sourced | 130°CsourceUL Relative Thermal Index (UL 796) |
| Values for | A380 aluminium high-pressure die-casting alloy, typical properties; Rheocast Company (aluminium die caster, Germantown WI) A380 alloy data page. | Isola 370HR FR-4 laminate (Polyclad PCL-FR-370HR, 180 C Tg multifunctional epoxy, E-glass fabric), copper removed; Isola data sheet Revision C, last updated April 15, 2021. Woven-glass laminate: the sheet gives in-plane values per weave direction (length / cross) and the Z-axis CTE separately; the solver is isotropic per material. |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Aluminum A380 stronger than PCB Laminate FR-4?
PCB Laminate FR-4 is stronger: its tensile strength is 315 MPa against yield strength 160 MPa for Aluminum A380 (1.97x).
Which is lighter, Aluminum A380 or PCB Laminate FR-4?
PCB Laminate FR-4 is lighter: 1,920 kg/m³ against 2,713 kg/m³ for Aluminum A380.
Which is stiffer, Aluminum A380 or PCB Laminate FR-4?
Aluminum A380 is stiffer: Young's modulus 71 GPa against 23.9 GPa for PCB Laminate FR-4, so the same part in Aluminum A380 deflects less under the same load.
Which is lighter for the same job, Aluminum A380 or PCB Laminate FR-4?
For the same stiffness or strength: Aluminum A380 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; PCB Laminate FR-4 is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Aluminum A380 | PCB Laminate FR-4 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 2.11x heavier |
| Stiff beam (bending) | lighter | 22% heavier |
| Stiff panel or plate | lighter | 2% heavier |
| Strong rod or tie | 2.79x heavier | lighter |
| Strong beam | 2.22x heavier | lighter |
| Strong panel or plate | 1.98x heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Aluminum A380 or PCB Laminate FR-4?
Aluminum A380 conducts heat better: 96.2 W/m·K against 0.4 W/m·K for PCB Laminate FR-4.
Which expands less with temperature?
PCB Laminate FR-4 expands less: 13.5 µm/m·K against 21.8 µm/m·K for Aluminum A380.