Brass C360 vs. Plastic PBT GF30

Compare Brass C360 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	310MPasourcetypical, 0.5% extension under load	not given (tensile used)
Ultimate tensile strength	400MPasourcetypical	140MPasourcestress at break, 23 °C
Flexural strength	not sourced	210MPasourcetypical, 23 °C
Elongation at break	25%sourcetypical, 1 in. rod	3%sourcestrain at break, 23 °C
Young's modulus (stiffness)	96.5GPasourcetypical, temper-independent	9.8GPasourcetypical, 23 °C
Density	8,498kg/m³sourcenominal	1,530kg/m³sourcetypical
Strength to weight	36.5kN·m/kg	91.5kN·m/kg2.51x higher
Stiffness to weight	11.4MN·m/kg1.77x higher	6.41MN·m/kg
Poisson's ratio	0.34sourcebase material: leaded free-machining brass CuZn39Pb2 (C37700), Wieland-Z30 rolled products, reference value at room temperature	not sourced
Shear modulus	36GPa	not sourced
Bulk modulus	101GPa	not sourced
Speed of sound	3,370m/s	2,531m/s
Thermal
Thermal conductivity	116W/m·Ksourcetypical, 20 °C	0.27W/m·Ksourcetypical (DIN 52612-1)
Thermal expansion	20.5µm/m·Ksourcetypical, mean 20-300 °C	25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C
100 mm part over a 50 °C swing	103µm growth22% less	125µm growth
Specific heat	377J/kg·Ksourcetypical, 20 °C	1,050J/kg·Ksourcetypical, 23 °C
Heats up and cools (diffusivity)	36.2mm²/s216x faster	0.168mm²/s
Thermal shock resistance	11,997W/m	not sourced
Melting point	888–899°Csourcesolidus-liquidus	223°CsourceDSC (ISO 11357)
Max service temperature	not sourced	205°CsourceHDT 1.8 MPa
Values for	C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values	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 Brass C360 stronger than Plastic PBT GF30?

Brass C360 is stronger: its yield strength is 310 MPa against tensile strength 140 MPa for Plastic PBT GF30 (2.21x).

Which is lighter, Brass C360 or Plastic PBT GF30?

Plastic PBT GF30 is lighter: 1,530 kg/m³ against 8,498 kg/m³ for Brass C360.

Which is stiffer, Brass C360 or Plastic PBT GF30?

Brass C360 is stiffer: Young's modulus 96.5 GPa against 9.8 GPa for Plastic PBT GF30, so the same part in Brass C360 deflects less under the same load.

Which is lighter for the same job, Brass C360 or Plastic PBT GF30?

For the same stiffness or strength: Brass C360 is lighter for a stiff rod or tie (tension); Plastic PBT GF30 is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.

Part that must be	Brass C360	Plastic PBT GF30
Stiff rod or tie (tension)	lighter	1.77x heavier
Stiff beam (bending)	1.77x heavier	lighter
Stiff panel or plate	2.59x heavier	lighter
Strong rod or tie	2.51x heavier	lighter
Strong beam	3.27x heavier	lighter
Strong panel or plate	3.73x 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, Brass C360 or Plastic PBT GF30?

Brass C360 conducts heat better: 116 W/m·K against 0.27 W/m·K for Plastic PBT GF30.

Which expands less with temperature?

Brass C360 expands less: 20.5 µm/m·K against 25 µm/m·K for Plastic PBT GF30.

Among 72 materials

Stiffness against density

Strength against density