Plastic PPS GF40 vs. Titanium Ti-6Al-4V

Compare Plastic PPS GF40 vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Plastic PPS GF40Bulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	195MPasourcetensile strength, 5 mm/min	940MPasourcetypical, plate, annealed
Flexural strength	285MPasourceflexural strength at break	not sourced
Elongation at break	1.9%sourcestrain at break, 5 mm/min	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	14.7GPasourcetypical, 1 mm/min	107–122GPasourcetypical range, 20 °C
Density	1,650kg/m³sourcetypical	4,430kg/m³sourcenominal
Strength to weight	118kN·m/kg	200kN·m/kg1.69x higher
Stiffness to weight	8.91MN·m/kg	25.8MN·m/kg2.9x higher
Poisson's ratio	0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific)	0.342sourcemean of TIMET measurements
Shear modulus	5.44GPa	42.7GPa7.84x stiffer in shear
Bulk modulus	16.3GPa	121GPa
Speed of sound	2,985m/s	5,084m/s
Thermal
Thermal conductivity	0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific)	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	12µm/m·Ksourceparallel (flow), mean -50 to 90 °C	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	60µm growth	45µm growth33% less
Specific heat	not sourced	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	not sourced	2.57mm²/s
Thermal shock resistance	144W/m	3,730W/m26x more resistant
Melting point	280°CsourceDSC, 10 °C/min	1,630–1,650°Csourcemelting range
Glass transition	90°CsourceDSC, 10 °C/min	not sourced
Max service temperature	270°CsourceHDT 1.8 MPa	400°Csourceupper recommended use temperature
Values for	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).	TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

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 Plastic PPS GF40 stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against tensile strength 195 MPa for Plastic PPS GF40 (4.54x).

Which is lighter, Plastic PPS GF40 or Titanium Ti-6Al-4V?

Plastic PPS GF40 is lighter: 1,650 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Plastic PPS GF40 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 14.7 GPa for Plastic PPS GF40, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Plastic PPS GF40 or Titanium Ti-6Al-4V?

For the same stiffness or strength: Plastic PPS GF40 is lighter for a stiff panel or plate, strong panel or plate; Titanium Ti-6Al-4V is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam.

Part that must be	Plastic PPS GF40	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	2.9x heavier	lighter
Stiff beam (bending)	4% heavier	lighter
Stiff panel or plate	lighter	35% heavier
Strong rod or tie	1.69x heavier	lighter
Strong beam	2% heavier	lighter
Strong panel or plate	lighter	26% 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, Plastic PPS GF40 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V conducts heat better: 6.6 W/m·K against 0.2 W/m·K for Plastic PPS GF40.

Which expands less with temperature?

Titanium Ti-6Al-4V expands less: 9 µm/m·K against 12 µm/m·K for Plastic PPS GF40.

Among 72 materials

Stiffness against density

Strength against density