Materials / Compare
Magnesium AZ31B-H24 vs. Plastic PEEK
Compare Magnesium AZ31B-H24 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 | 220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 290MPasourcetypical, H24, 0.5-6 mm | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | not sourced | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | 13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 44.8GPasourcetypical (handbook physical constant) | 4GPasourcetypical (nominal) |
| Density | 1,769kg/m³sourcenominal | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | 124kN·m/kg1.65x higher | 75.4kN·m/kg |
| Stiffness to weight | 25.3MN·m/kg8.23x higher | 3.08MN·m/kg |
| Poisson's ratio | 0.35sourcetypical (handbook physical constant) | 0.38sourcetypical |
| Shear modulus | 16.6GPa11.4x stiffer in shear | 1.45GPa |
| Bulk modulus | 49.8GPa | 5.56GPa |
| Speed of sound | 5,032m/s | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 76.9W/m·Ksourcetypical (temper/temperature not stated) | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 26.8µm/m·Ksourcetypical (temperature range not stated) | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 134µm growth2.05x less | 275µm growth |
| Specific heat | 1,040J/kg·Ksourcetypical | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | 41.8mm²/s412x faster | 0.101mm²/s |
| Thermal shock resistance | 9,159W/m114x more resistant | 80.1W/m |
| Melting point | not sourced | 343°Csourcetypical, DSC |
| Glass transition | not sourced | 143°Csourceonset (midpoint 150 C) |
| Max service temperature | 149°Csourcestated application limit | 240°CsourceUL 746B RTI, mechanical strength (continuous use index) |
| Values for | AZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS | 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 Magnesium AZ31B-H24 stronger than Plastic PEEK?
Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 98 MPa for Plastic PEEK (2.24x).
Which is lighter, Magnesium AZ31B-H24 or Plastic PEEK?
Plastic PEEK is lighter: 1,300 kg/m³ against 1,769 kg/m³ for Magnesium AZ31B-H24.
Which is stiffer, Magnesium AZ31B-H24 or Plastic PEEK?
Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 4 GPa for Plastic PEEK, so the same part in Magnesium AZ31B-H24 deflects less under the same load.
Which is lighter for the same job, Magnesium AZ31B-H24 or Plastic PEEK?
For the same stiffness or strength: Magnesium AZ31B-H24 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Magnesium AZ31B-H24 | Plastic PEEK |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 8.23x heavier |
| Stiff beam (bending) | lighter | 2.46x heavier |
| Stiff panel or plate | lighter | 1.64x heavier |
| Strong rod or tie | lighter | 1.65x heavier |
| Strong beam | lighter | 26% heavier |
| Strong panel or plate | lighter | 10% 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 conducts heat better, Magnesium AZ31B-H24 or Plastic PEEK?
Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 0.29 W/m·K for Plastic PEEK.
Which expands less with temperature?
Magnesium AZ31B-H24 expands less: 26.8 µm/m·K against 55 µm/m·K for Plastic PEEK.