Materials / Compare
Brass C260 vs. Plastic PEEK
Compare Brass C260 vs. Plastic PEEK strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 345MPasourcenominal, strip/flat, 0.5% extension (not 0.2% offset) | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 427MPasourcenominal, strip/flat | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | not sourced | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | 23%sourcenominal, in 2.0 in., strip/flat | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 110GPasourcetypical, temper-independent | 4GPasourcetypical (nominal) |
| Density | 8,525kg/m³sourcenominal | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | 40.5kN·m/kg | 75.4kN·m/kg1.86x higher |
| Stiffness to weight | 12.9MN·m/kg4.2x higher | 3.08MN·m/kg |
| Poisson's ratio | 0.34sourcereference value at room temperature (Wieland-M30 = CuZn30 = C26000, rolled products) | 0.38sourcetypical |
| Shear modulus | 41.2GPa28.4x stiffer in shear | 1.45GPa |
| Bulk modulus | 115GPa | 5.56GPa |
| Speed of sound | 3,597m/s | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 121W/m·Ksourcetypical, 20 °C | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 20µm/m·Ksourcetypical, mean 20-300 °C | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 100µm growth2.75x less | 275µm growth |
| Specific heat | 377J/kg·Ksourcetypical, 20 °C | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | 37.7mm²/s372x faster | 0.101mm²/s |
| Thermal shock resistance | 12,510W/m156x more resistant | 80.1W/m |
| Melting point | 916–954°Csourcesolidus-liquidus | 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 | C26000 cartridge brass, H02 half hard flat/strip: CDA Electronic Connector Design Guide (mechanical) + CDA alloy page (physical) | 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 Brass C260 stronger than Plastic PEEK?
Brass C260 is stronger: its yield strength is 345 MPa against 98 MPa for Plastic PEEK (3.52x).
Which is lighter, Brass C260 or Plastic PEEK?
Plastic PEEK is lighter: 1,300 kg/m³ against 8,525 kg/m³ for Brass C260.
Which is stiffer, Brass C260 or Plastic PEEK?
Brass C260 is stiffer: Young's modulus 110 GPa against 4 GPa for Plastic PEEK, so the same part in Brass C260 deflects less under the same load.
Which is lighter for the same job, Brass C260 or Plastic PEEK?
For the same stiffness or strength: Brass C260 is lighter for a stiff rod or tie (tension); Plastic PEEK is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Brass C260 | Plastic PEEK |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 4.2x heavier |
| Stiff beam (bending) | 25% heavier | lighter |
| Stiff panel or plate | 2.17x heavier | lighter |
| Strong rod or tie | 1.86x heavier | lighter |
| Strong beam | 2.83x heavier | lighter |
| Strong panel or plate | 3.5x 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, Brass C260 or Plastic PEEK?
Brass C260 conducts heat better: 121 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Brass C260 expands less: 20 µm/m·K against 55 µm/m·K for Plastic PEEK.