Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
Try it on a partA bracket to run stress or thermal on, free in your browser
VICTREX PEEK 450G Technical Data SheetVictrexPlastic PEEK · Yield strength: typical, tensile yieldPlastic PEEK · Compressive strength: typical, 23 CPlastic PEEK · Flexural strength: typical, flexural stress at yield, 23 CPlastic PEEK · Elongation at break: typical, at breakPlastic PEEK · Young's modulus (stiffness): typical (nominal)Plastic PEEK · Density: typical (crystalline)Plastic PEEK · Thermal conductivity: typical, average, 23 CPlastic PEEK · Thermal expansion: average of flow/cross-flow, below Tg (<143 C)Plastic PEEK · Melting point: typical, DSCPlastic PEEK · Glass transition: onset (midpoint 150 C)Plastic PEEK · Max service temperature: UL 746B RTI, mechanical strength (continuous use index)
3
Engineering Polymers Part and Mold Design: Thermoplastics, A Design GuideCovestroPlastic Nylon PA66 · Poisson's ratio: base material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1)
4
VICTREX PEEK for Use in Fluid Management (2020)VictrexPlastic PEEK · Poisson's ratio: typical
5
VICTREX PEEK 450G Technical Data Sheet (2012)Victrexarchived copyPlastic PEEK · Specific heat: typical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Plastic Nylon PA66 stronger than Plastic PEEK?
Plastic PEEK is stronger: its yield strength is 98 MPa against 85 MPa for Plastic Nylon PA66 (15%).
Which is lighter, Plastic Nylon PA66 or Plastic PEEK?
Plastic Nylon PA66 is lighter: 1,130 kg/m³ against 1,300 kg/m³ for Plastic PEEK.
Which is stiffer, Plastic Nylon PA66 or Plastic PEEK?
Plastic PEEK is stiffer: Young's modulus 4 GPa against 3 GPa for Plastic Nylon PA66, so the same part in Plastic PEEK deflects less under the same load.
Which is lighter for the same job, Plastic Nylon PA66 or Plastic PEEK?
For the same stiffness or strength: Plastic Nylon PA66 is lighter for a stiff panel or plate, strong beam, strong panel or plate; Plastic PEEK is lighter for a stiff rod or tie (tension).
Part that must be
Plastic Nylon PA66
Plastic PEEK
Stiff rod or tie (tension)
16% heavier
lighter
Stiff beam (bending)
about equal
about equal
Stiff panel or plate
lighter
5% heavier
Strong rod or tie
about equal
about equal
Strong beam
lighter
5% heavier
Strong panel or plate
lighter
7% heavier
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 is more ductile, Plastic Nylon PA66 or Plastic PEEK?
Plastic Nylon PA66 stretches further before it breaks: 30% elongation at break against 25% for Plastic PEEK.
Thermal
Which conducts heat better, Plastic Nylon PA66 or Plastic PEEK?
Plastic Nylon PA66 conducts heat better: 0.33 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Plastic PEEK expands less: 55 µm/m·K against 98 µm/m·K for Plastic Nylon PA66.