6061-T6/T651, Kaiser Aluminum typical properties (sheet, coil & plate datasheet); Poisson from MIL-HDBK-5J
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 stronger than Plastic PBT GF30?
Aluminum is stronger: its yield strength is 276 MPa against tensile strength 140 MPa for Plastic PBT GF30 (1.97x).
Which is lighter, Aluminum or Plastic PBT GF30?
Plastic PBT GF30 is lighter: 1,530 kg/m³ against 2,700 kg/m³ for Aluminum.
Which is stiffer, Aluminum or Plastic PBT GF30?
Aluminum is stiffer: Young's modulus 68.3 GPa against 9.8 GPa for Plastic PBT GF30, so the same part in Aluminum deflects less under the same load.
Which is lighter for the same job, Aluminum or Plastic PBT GF30?
For the same stiffness or strength: Aluminum is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie; Plastic PBT GF30 is lighter for a strong beam, strong panel or plate.
Part that must be
Aluminum
Plastic PBT GF30
Stiff rod or tie (tension)
lighter
3.95x heavier
Stiff beam (bending)
lighter
50% heavier
Stiff panel or plate
lighter
8% heavier
Strong rod or tie
lighter
12% heavier
Strong beam
12% heavier
lighter
Strong panel or plate
26% 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 or Plastic PBT GF30?
Aluminum conducts heat better: 167 W/m·K against 0.27 W/m·K for Plastic PBT GF30.
Which expands less with temperature?
Aluminum expands less: 23.6 µm/m·K against 25 µm/m·K for Plastic PBT GF30.