Aluminum 1100-O vs. Plastic PBT GF30

Compare Aluminum 1100-O vs. Plastic PBT GF30 strength, stiffness, weight and thermal properties.

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Plastic PBT GF30Bulk polymer (molded or machined)

Mechanical
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Yield strength	35MPasourcetypical, O, 0.0625 in specimen	not given (tensile used)
Ultimate tensile strength	90MPasourcetypical, O	140MPasourcestress at break, 23 °C
Flexural strength	not sourced	210MPasourcetypical, 23 °C
Elongation at break	35%sourcetypical, O, in 4D	3%sourcestrain at break, 23 °C
Young's modulus (stiffness)	69GPasourcetypical	9.8GPasourcetypical, 23 °C
Density	2,710kg/m³sourcenominal, 20 °C	1,530kg/m³sourcetypical
Strength to weight	12.9kN·m/kg	91.5kN·m/kg7.08x higher
Stiffness to weight	25.5MN·m/kg3.98x higher	6.41MN·m/kg
Poisson's ratio	not sourced	not sourced
Shear modulus	not sourced	not sourced
Bulk modulus	not sourced	not sourced
Speed of sound	5,046m/s	2,531m/s
Thermal
Thermal conductivity	222W/m·Ksourcetypical, O, 20 °C	0.27W/m·Ksourcetypical (DIN 52612-1)
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C
100 mm part over a 50 °C swing	118µm growth6% less	125µm growth
Specific heat	901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C	1,050J/kg·Ksourcetypical, 23 °C
Heats up and cools (diffusivity)	90.9mm²/s541x faster	0.168mm²/s
Thermal shock resistance	not sourced	not sourced
Melting point	640–655°Csourcemelting range	223°CsourceDSC (ISO 11357)
Max service temperature	not sourced	205°CsourceHDT 1.8 MPa
Values for	1100-O (annealed) commercially pure aluminium, Kaiser Aluminum Tube & Pipe Alloy 1100 Technical Data (Rev. 05/06), typical properties; specific heat from Hydro EN AW-1050A (99.5% Al) extruded-products datasheet (10/2018).	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.

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 Aluminum 1100-O stronger than Plastic PBT GF30?

Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 35 MPa for Aluminum 1100-O (4x).

Which is lighter, Aluminum 1100-O or Plastic PBT GF30?

Plastic PBT GF30 is lighter: 1,530 kg/m³ against 2,710 kg/m³ for Aluminum 1100-O.

Which is stiffer, Aluminum 1100-O or Plastic PBT GF30?

Aluminum 1100-O is stiffer: Young's modulus 69 GPa against 9.8 GPa for Plastic PBT GF30, so the same part in Aluminum 1100-O deflects less under the same load.

Which is lighter for the same job, Aluminum 1100-O or Plastic PBT GF30?

For the same stiffness or strength: Aluminum 1100-O is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Plastic PBT GF30 is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 1100-O	Plastic PBT GF30
Stiff rod or tie (tension)	lighter	3.98x heavier
Stiff beam (bending)	lighter	50% heavier
Stiff panel or plate	lighter	8% heavier
Strong rod or tie	7.08x heavier	lighter
Strong beam	4.46x heavier	lighter
Strong panel or plate	3.54x heavier	lighter

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, Aluminum 1100-O or Plastic PBT GF30?

Aluminum 1100-O conducts heat better: 222 W/m·K against 0.27 W/m·K for Plastic PBT GF30.

Which expands less with temperature?

Aluminum 1100-O expands less: 23.6 µm/m·K against 25 µm/m·K for Plastic PBT GF30.

Among 72 materials

Stiffness against density

Strength against density