Materials / Plastic
Plastic PEEK
Plastic PEEK (bulk) strength, stiffness, density and thermal properties, with their source.
A bracket in Plastic PEEK, smooth finish.
| Mechanical | |
|---|---|
| Yield strength | 98MPa1 |
| Compressive strength | 125MPa1 |
| Flexural strength | 165MPa1 |
| Elongation at break | 25%1 |
| Young's modulus (stiffness) | 4GPa1 |
| Density | 1,300kg/m³1 |
| Strength to weight | 75.4kN·m/kg |
| Stiffness to weight | 3.08MN·m/kg |
| Poisson's ratio | 0.382 |
| Shear modulus | 1.45GPa |
| Bulk modulus | 5.56GPa |
| Speed of sound | 1,754m/s |
| Thermal | |
|---|---|
| Thermal conductivity | 0.29W/m·K1 |
| Thermal expansion | 55µm/m·K1 |
| 100 mm part over a 50 °C swing | 275µm growth |
| Specific heat | 2,200J/kg·K3 |
| Heats up and cools (diffusivity) | 0.101mm²/s |
| Thermal shock resistance | 80.1W/m |
| Melting point | 343°C1 |
| Glass transition | onset143°C1 |
| Max service temperature | UL 746B RTI240°C1 |
Sources3 documents: Victrex
- Values for
- Bulk polymer (molded or machined). Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07)
- 1VICTREX PEEK 450G Technical Data SheetVictrexYield strength: typical, tensile yieldCompressive strength: typical, 23 CFlexural strength: typical, flexural stress at yield, 23 CElongation at break: typical, at breakYoung's modulus (stiffness): typical (nominal)Density: typical (crystalline)Thermal conductivity: typical, average, 23 CThermal expansion: average of flow/cross-flow, below Tg (<143 C)Melting point: typical, DSCGlass transition: onset (midpoint 150 C)Max service temperature: UL 746B RTI, mechanical strength (continuous use index)
- 2VICTREX PEEK for Use in Fluid Management (2020)VictrexPoisson's ratio: typical
- 3VICTREX PEEK 450G Technical Data Sheet (2012)Victrexarchived copySpecific heat: typical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012)
Thermal properties of Plastic PEEK
Thermal conductivity of Plastic PEEK
Plastic PEEK has a thermal conductivity of 0.29 W/m·K (0.168 BTU/hr·ft·°F). Basis: typical, average, 23 C. Source: Victrex, VICTREX PEEK 450G Technical Data Sheet.
Specific heat of Plastic PEEK
The specific heat capacity of Plastic PEEK is 2,200 J/kg·K (0.525 BTU/lb·°F). Basis: typical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012). Source: Victrex, VICTREX PEEK 450G Technical Data Sheet (2012)archived copy.
Coefficient of thermal expansion of Plastic PEEK
Plastic PEEK expands 55 µm/m·K (30.6 µin/in·°F): a 100 mm part grows 275 µm over a 50 °C rise. Basis: average of flow/cross-flow, below Tg (<143 C). Source: Victrex, VICTREX PEEK 450G Technical Data Sheet.
Thermal diffusivity of Plastic PEEK
Computed from the conductivity, density and specific heat (k / ρc): 0.101 mm²/s, how fast a temperature change spreads through it.
Melting point of Plastic PEEK
Plastic PEEK melts at 343 °C (649 °F). Basis: typical, DSC. Source: Victrex, VICTREX PEEK 450G Technical Data Sheet.
Glass transition temperature of Plastic PEEK
Plastic PEEK softens at its glass transition, 143 °C (289 °F). Basis: onset (midpoint 150 C). Source: Victrex, VICTREX PEEK 450G Technical Data Sheet.
Maximum service temperature of Plastic PEEK
The maximum service temperature of Plastic PEEK is 240 °C (464 °F). Basis: UL 746B RTI, mechanical strength (continuous use index). Source: Victrex, VICTREX PEEK 450G Technical Data Sheet.
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