Plastic PBT GF30 vs. Titanium Ti-6Al-4V

Compare Plastic PBT GF30 vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Plastic PBT GF30Bulk 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	140MPasourcestress at break, 23 °C	940MPasourcetypical, plate, annealed
Flexural strength	210MPasourcetypical, 23 °C	not sourced
Elongation at break	3%sourcestrain at break, 23 °C	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	9.8GPasourcetypical, 23 °C	107–122GPasourcetypical range, 20 °C
Density	1,530kg/m³sourcetypical	4,430kg/m³sourcenominal
Strength to weight	91.5kN·m/kg	200kN·m/kg2.18x higher
Stiffness to weight	6.41MN·m/kg	25.8MN·m/kg4.04x higher
Poisson's ratio	not sourced	0.342sourcemean of TIMET measurements
Shear modulus	not sourced	42.7GPa
Bulk modulus	not sourced	121GPa
Speed of sound	2,531m/s	5,084m/s
Thermal
Thermal conductivity	0.27W/m·Ksourcetypical (DIN 52612-1)	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	125µm growth	45µm growth2.78x less
Specific heat	1,050J/kg·Ksourcetypical, 23 °C	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	0.168mm²/s	2.57mm²/s15.3x faster
Thermal shock resistance	not sourced	3,730W/m
Melting point	223°CsourceDSC (ISO 11357)	1,630–1,650°Csourcemelting range
Max service temperature	205°CsourceHDT 1.8 MPa	400°Csourceupper recommended use temperature
Values for	BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C.	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 PBT GF30 stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against tensile strength 140 MPa for Plastic PBT GF30 (6.32x).

Which is lighter, Plastic PBT GF30 or Titanium Ti-6Al-4V?

Plastic PBT GF30 is lighter: 1,530 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Plastic PBT GF30 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 9.8 GPa for Plastic PBT GF30, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Plastic PBT GF30 or Titanium Ti-6Al-4V?

For the same stiffness or strength: Plastic PBT GF30 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 PBT GF30	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	4.04x heavier	lighter
Stiff beam (bending)	18% heavier	lighter
Stiff panel or plate	lighter	28% heavier
Strong rod or tie	2.18x heavier	lighter
Strong beam	18% heavier	lighter
Strong panel or plate	lighter	15% 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 PBT GF30 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V conducts heat better: 6.6 W/m·K against 0.27 W/m·K for Plastic PBT GF30.

Which expands less with temperature?

Titanium Ti-6Al-4V expands less: 9 µm/m·K against 25 µm/m·K for Plastic PBT GF30.

Among 72 materials

Stiffness against density

Strength against density