Materials / Compare
Concrete vs. Plastic PEEK
Compare Concrete vs. Plastic PEEK 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 | not sourced | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | not sourced | not sourced |
| Compressive strength | 27.6MPasourcespecified compressive strength class (f'c), not a measured typical | 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) | not sourced | 4GPasourcetypical (nominal) |
| Density | 2,240–2,400kg/m³sourcerange for normalweight concrete | 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 | 0.15–0.2sourcegeneral range at normal ambient conditions (overall 0.11-0.32) | 0.38sourcetypical |
| Shear modulus | not sourced | 1.45GPa |
| Bulk modulus | not sourced | 5.56GPa |
| Speed of sound | not sourced | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 0.9W/m·Ksourcetypical (comparative value) | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 8–12µm/m·Ksourcetypical range for portland cement concrete (aggregate dependent) | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 50µm growth5.5x less | 275µm growth |
| Specific heat | 900J/kg·Ksourcetypical (NIST guidance for thermal analysis) | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | 0.431mm²/s4.25x faster | 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 | 65°Csourcecode long-term temperature limit (ASME Code, concrete containments) | 240°CsourceUL 746B RTI, mechanical strength (continuous use index) |
| Values for | Normal-weight portland cement concrete, strength class f'c = 4000 psi (28 MPa) per NRMCA CIP 35; density NRMCA CIP 36; thermal conductivity USDA FPL Wood Handbook; service temperature ORNL/NRC review | 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
Which is lighter, Concrete or Plastic PEEK?
Plastic PEEK is lighter: 1,300 kg/m³ against 2,320 kg/m³ for Concrete.
Which conducts heat better, Concrete or Plastic PEEK?
Concrete conducts heat better: 0.9 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Concrete expands less: 10 µm/m·K against 55 µm/m·K for Plastic PEEK.