Materials / Compare
Magnesium AZ31B-H24 vs. Plastic PMMA
Compare Magnesium AZ31B-H24 vs. Plastic PMMA 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 | not given (tensile used) |
| Ultimate tensile strength | 290MPasourcetypical, H24, 0.5-6 mm | 80MPasourcetypical, 23 °C |
| Compressive strength | not sourced | 110MPasourcecompressive yield stress, typical |
| Flexural strength | not sourced | 115MPasourcetypical |
| Elongation at break | 13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A | 5.5%sourcetypical |
| Young's modulus (stiffness) | 44.8GPasourcetypical (handbook physical constant) | 3.3GPasourcetypical, short-term |
| Density | 1,769kg/m³sourcenominal | 1,190kg/m³sourcetypical |
| Strength to weight | 124kN·m/kg1.85x higher | 67.2kN·m/kg |
| Stiffness to weight | 25.3MN·m/kg9.13x higher | 2.77MN·m/kg |
| Poisson's ratio | 0.35sourcetypical (handbook physical constant) | 0.37sourcetypical |
| Shear modulus | 16.6GPa13.8x stiffer in shear | 1.2GPa |
| Bulk modulus | 49.8GPa | 4.23GPa |
| Speed of sound | 5,032m/s | 1,665m/s |
| Thermal | ||
| Thermal conductivity | 76.9W/m·Ksourcetypical (temper/temperature not stated) | 0.19W/m·Ksourcetypical |
| Thermal expansion | 26.8µm/m·Ksourcetypical (temperature range not stated) | 70µm/m·Ksource0-50 °C |
| 100 mm part over a 50 °C swing | 134µm growth2.61x less | 350µm growth |
| Specific heat | 1,040J/kg·Ksourcetypical | 1,470J/kg·Ksourcetypical |
| Heats up and cools (diffusivity) | 41.8mm²/s385x faster | 0.109mm²/s |
| Thermal shock resistance | 9,159W/m221x more resistant | 41.5W/m |
| Max service temperature | 149°Csourcestated application limit | 80°Csourcemax. permanent service temperature |
| 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 | Röhm PLEXIGLAS GS 0F00 cast acrylic sheet, typical values at 23 °C / 50 % RH (Röhm Technical Information Ref. No. 211-1) |
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 PMMA?
Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against tensile strength 80 MPa for Plastic PMMA (2.75x).
Which is lighter, Magnesium AZ31B-H24 or Plastic PMMA?
Plastic PMMA is lighter: 1,190 kg/m³ against 1,769 kg/m³ for Magnesium AZ31B-H24.
Which is stiffer, Magnesium AZ31B-H24 or Plastic PMMA?
Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 3.3 GPa for Plastic PMMA, 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 PMMA?
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 PMMA |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 9.13x heavier |
| Stiff beam (bending) | lighter | 2.48x heavier |
| Stiff panel or plate | lighter | 1.6x heavier |
| Strong rod or tie | lighter | 1.85x heavier |
| Strong beam | lighter | 32% heavier |
| Strong panel or plate | lighter | 12% 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 PMMA?
Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 0.19 W/m·K for Plastic PMMA.
Which expands less with temperature?
Magnesium AZ31B-H24 expands less: 26.8 µm/m·K against 70 µm/m·K for Plastic PMMA.