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PCB Board FR-4, 2 copper planes vs. Plastic PEEK
Compare PCB Board FR-4, 2 copper planes vs. Plastic PEEK strength, stiffness, weight and thermal properties.
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PCB Board FR-4, 2 copper planesComposite
Plastic PEEKBulk polymer (molded or machined)
| 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 | not given (tensile used) | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039) | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | not sourced | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | not sourced | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out | 4GPasourcetypical (nominal) |
| Density | not sourced | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | not sourced | 75.4kN·m/kg |
| Stiffness to weight | not sourced | 3.08MN·m/kg |
| Poisson's ratio | 0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction | 0.38sourcetypical |
| Shear modulus | 10.2GPa7.01x stiffer in shear | 1.45GPa |
| Bulk modulus | 12.2GPa | 5.56GPa |
| Speed of sound | not sourced | 1,754m/s |
| Thermal | ||
| Thermal conductivity | not sourced | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C) | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 67.5µm growth4.07x less | 275µm growth |
| Specific heat | not sourced | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | not sourced | 0.101mm²/s |
| Thermal shock resistance | not sourced | 80.1W/m |
| Melting point | not sourced | 343°Csourcetypical, DSC |
| Glass transition | not sourced | 143°Csourceonset (midpoint 150 C) |
| Max service temperature | not sourced | 240°CsourceUL 746B RTI, mechanical strength (continuous use index) |
| Values for | A whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's. | Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07) |
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 PCB Board FR-4, 2 copper planes stronger than Plastic PEEK?
PCB Board FR-4, 2 copper planes is stronger: its tensile strength is 315 MPa against yield strength 98 MPa for Plastic PEEK (3.22x).
Which is stiffer, PCB Board FR-4, 2 copper planes or Plastic PEEK?
PCB Board FR-4, 2 copper planes is stiffer: Young's modulus 23.9 GPa against 4 GPa for Plastic PEEK, so the same part in PCB Board FR-4, 2 copper planes deflects less under the same load.
Which expands less with temperature?
PCB Board FR-4, 2 copper planes expands less: 13.5 µm/m·K against 55 µm/m·K for Plastic PEEK.
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