Materials / Compare
Magnesium AZ31B-H24 vs. Plastic PETG
Compare Magnesium AZ31B-H24 vs. Plastic PETG 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 | 46.2MPasourcetypical |
| Ultimate tensile strength | 290MPasourcetypical, H24, 0.5-6 mm | 46.2MPasourcetypical, peak stress (= stress at yield) |
| Flexural strength | not sourced | 78.9MPasourcetypical |
| Elongation at break | 13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A | 7.6%sourcetypical |
| Young's modulus (stiffness) | 44.8GPasourcetypical (handbook physical constant) | 1.94GPasourcetypical |
| Density | 1,769kg/m³sourcenominal | 1,270kg/m³sourcetypical |
| Strength to weight | 124kN·m/kg3.42x higher | 36.4kN·m/kg |
| Stiffness to weight | 25.3MN·m/kg16.6x higher | 1.53MN·m/kg |
| Poisson's ratio | 0.35sourcetypical (handbook physical constant) | not sourced |
| Shear modulus | 16.6GPa | not sourced |
| Bulk modulus | 49.8GPa | not sourced |
| Speed of sound | 5,032m/s | 1,236m/s |
| Thermal | ||
| Thermal conductivity | 76.9W/m·Ksourcetypical (temper/temperature not stated) | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| Thermal expansion | 26.8µm/m·Ksourcetypical (temperature range not stated) | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| 100 mm part over a 50 °C swing | 134µm growth1.9x less | 255µm growth |
| Specific heat | 1,040J/kg·Ksourcetypical | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) |
| Heats up and cools (diffusivity) | 41.8mm²/s329x faster | 0.127mm²/s |
| Thermal shock resistance | 9,159W/m | not sourced |
| Glass transition | not sourced | 77.4°Csourcetypical |
| Max service temperature | 149°Csourcestated application limit | 76.2°CsourceHDT 0.455 MPa (printed specimens) |
| 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 | Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. |
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.
Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Magnesium AZ31B-H24 stronger than Plastic PETG?
Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 46.2 MPa for Plastic PETG (4.76x).
Which is lighter, Magnesium AZ31B-H24 or Plastic PETG?
Plastic PETG is lighter: 1,270 kg/m³ against 1,769 kg/m³ for Magnesium AZ31B-H24.
Which is stiffer, Magnesium AZ31B-H24 or Plastic PETG?
Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 1.94 GPa for Plastic PETG, 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 PETG?
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 PETG |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 16.6x heavier |
| Stiff beam (bending) | lighter | 3.45x heavier |
| Stiff panel or plate | lighter | 2.04x heavier |
| Strong rod or tie | lighter | 3.42x heavier |
| Strong beam | lighter | 2.03x heavier |
| Strong panel or plate | lighter | 1.57x 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 PETG?
Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature?
Magnesium AZ31B-H24 expands less: 26.8 µm/m·K against 51 µm/m·K for Plastic PETG.