Magnesium AZ31B-H24 vs. Plastic PPS GF40

Compare Magnesium AZ31B-H24 vs. Plastic PPS GF40 strength, stiffness, weight and thermal properties.

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Plastic PPS GF40Bulk polymer (molded or machined)

Mechanical
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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	195MPasourcetensile strength, 5 mm/min
Flexural strength	not sourced	285MPasourceflexural strength at break
Elongation at break	13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A	1.9%sourcestrain at break, 5 mm/min
Young's modulus (stiffness)	44.8GPasourcetypical (handbook physical constant)	14.7GPasourcetypical, 1 mm/min
Density	1,769kg/m³sourcenominal	1,650kg/m³sourcetypical
Strength to weight	124kN·m/kg5% higher	118kN·m/kg
Stiffness to weight	25.3MN·m/kg2.84x higher	8.91MN·m/kg
Poisson's ratio	0.35sourcetypical (handbook physical constant)	0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific)
Shear modulus	16.6GPa3.05x stiffer in shear	5.44GPa
Bulk modulus	49.8GPa	16.3GPa
Speed of sound	5,032m/s	2,985m/s
Thermal
Thermal conductivity	76.9W/m·Ksourcetypical (temper/temperature not stated)	0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific)
Thermal expansion	26.8µm/m·Ksourcetypical (temperature range not stated)	12µm/m·Ksourceparallel (flow), mean -50 to 90 °C
100 mm part over a 50 °C swing	134µm growth	60µm growth2.23x less
Specific heat	1,040J/kg·Ksourcetypical	not sourced
Heats up and cools (diffusivity)	41.8mm²/s	not sourced
Thermal shock resistance	9,159W/m63.7x more resistant	144W/m
Melting point	not sourced	280°CsourceDSC, 10 °C/min
Glass transition	not sourced	90°CsourceDSC, 10 °C/min
Max service temperature	149°Csourcestated application limit	270°CsourceHDT 1.8 MPa
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	Celanese Fortron 1140L4 (PPS, 40% glass fibre), injection moulding; FORTRON PPS Short-Term Properties Guide (PPS-012, 2016); thermal conductivity and Poisson for 40% glass-reinforced Fortron from the Fortron PPS Design Manual (PPS-050, 2013).

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 PPS GF40?

Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against tensile strength 195 MPa for Plastic PPS GF40 (13%).

Which is lighter, Magnesium AZ31B-H24 or Plastic PPS GF40?

Plastic PPS GF40 is lighter: 1,650 kg/m³ against 1,769 kg/m³ for Magnesium AZ31B-H24.

Which is stiffer, Magnesium AZ31B-H24 or Plastic PPS GF40?

Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 14.7 GPa for Plastic PPS GF40, 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 PPS GF40?

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.

Part that must be	Magnesium AZ31B-H24	Plastic PPS GF40
Stiff rod or tie (tension)	lighter	2.84x heavier
Stiff beam (bending)	lighter	1.63x heavier
Stiff panel or plate	lighter	35% heavier
Strong rod or tie	lighter	5% heavier
Strong beam	lighter	1% heavier
Strong panel or plate	about equal	about equal

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 PPS GF40?

Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 0.2 W/m·K for Plastic PPS GF40.

Which expands less with temperature?

Plastic PPS GF40 expands less: 12 µm/m·K against 26.8 µm/m·K for Magnesium AZ31B-H24.

Among 72 materials

Stiffness against density

Strength against density