Brass C360 vs. Solder SAC305

Compare Brass C360 vs. Solder SAC305 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	310MPasourcetypical, 0.5% extension under load	22MPasourcetypical
Ultimate tensile strength	400MPasourcetypical10.1x stronger	39.6MPasourcetypical
Elongation at break	25%sourcetypical, 1 in. rod	49%sourcetypical
Young's modulus (stiffness)	96.5GPasourcetypical, temper-independent	6.9GPasourcetypical, temperature and strain rate not stated
Density	8,498kg/m³sourcenominal	7,350kg/m³sourcetypical
Strength to weight	36.5kN·m/kg12.2x higher	2.99kN·m/kg
Stiffness to weight	11.4MN·m/kg12.1x higher	0.939MN·m/kg
Poisson's ratio	0.34sourcebase material: leaded free-machining brass CuZn39Pb2 (C37700), Wieland-Z30 rolled products, reference value at room temperature	0.35sourcetypical
Shear modulus	36GPa14.1x stiffer in shear	2.56GPa
Bulk modulus	101GPa	7.67GPa
Speed of sound	3,370m/s	969m/s
Thermal
Thermal conductivity	116W/m·Ksourcetypical, 20 °C	61W/m·Ksourcetypical, temperature not stated
Thermal expansion	20.5µm/m·Ksourcetypical, mean 20-300 °C	21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)
100 mm part over a 50 °C swing	103µm growth7% less	110µm growth
Specific heat	377J/kg·Ksourcetypical, 20 °C	232J/kg·Ksourcetypical (MacDermid Alpha)
Heats up and cools (diffusivity)	36.2mm²/s1% faster	35.8mm²/s
Thermal shock resistance	11,997W/m2.08x more resistant	5,773W/m
Melting point	888–899°Csourcesolidus-liquidus	217–220°Csourcesolidus-liquidus
Values for	C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values	SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).

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 Solder SAC305?

Brass C360 is stronger: its yield strength is 310 MPa against 22 MPa for Solder SAC305 (14.1x).

Which is lighter, Brass C360 or Solder SAC305?

Solder SAC305 is lighter: 7,350 kg/m³ against 8,498 kg/m³ for Brass C360.

Which is stiffer, Brass C360 or Solder SAC305?

Brass C360 is stiffer: Young's modulus 96.5 GPa against 6.9 GPa for Solder SAC305, so the same part in Brass C360 deflects less under the same load.

Which is lighter for the same job, Brass C360 or Solder SAC305?

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

Part that must be	Brass C360	Solder SAC305
Stiff rod or tie (tension)	lighter	12.1x heavier
Stiff beam (bending)	lighter	3.23x heavier
Stiff panel or plate	lighter	2.08x heavier
Strong rod or tie	lighter	12.2x heavier
Strong beam	lighter	5.05x heavier
Strong panel or plate	lighter	3.25x 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, Brass C360 or Solder SAC305?

Brass C360 conducts heat better: 116 W/m·K against 61 W/m·K for Solder SAC305.

Which expands less with temperature?

Brass C360 expands less: 20.5 µm/m·K against 21.9 µm/m·K for Solder SAC305.

Among 72 materials

Stiffness against density

Strength against density