Solder SAC305

Solder SAC305 (Sn96.5Ag3.0Cu0.5) strength, stiffness, density and thermal properties, with their source.

A bracket in Solder SAC305, as-cast finish.

Mechanical
Yield strength	22MPa1
Ultimate tensile strength	39.6MPa1
Elongation at break	49%1
Young's modulus (stiffness)	6.9GPa1
Density	7,350kg/m³1
Strength to weight	2.99kN·m/kg
Stiffness to weight	0.939MN·m/kg
Poisson's ratio	0.351
Shear modulus	2.56GPa
Bulk modulus	7.67GPa
Speed of sound	969m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	61W/m·K1
Thermal expansion	mean21.9µm/m·K2
100 mm part over a 50 °C swing	110µm growth
Specific heat	232J/kg·K2
Heats up and cools (diffusivity)	35.8mm²/s
Thermal shock resistance	5,773W/m
Melting point	solidus-liquidus217–220°C1

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

Sources2 documents: Indium Corporation, MacDermid Alpha

Values for: Cast. 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).

1
Indalloy 256 (SAC305) for Preforms Product Data Sheet (100346 R0)Indium Corporationarchived copyYield strength: typicalUltimate tensile strength: typicalElongation at break: typicalYoung's modulus (stiffness): typical, temperature and strain rate not statedDensity: typicalPoisson's ratio: typicalThermal conductivity: typical, temperature not statedMelting point: solidus-liquidus
2
ALPHA Vaculoy SAC Alloys Technical Data Sheet (2023)MacDermid AlphaThermal expansion: mean, 20-100 °C (MacDermid Alpha)Specific heat: typical (MacDermid Alpha)

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Thermal properties of Solder SAC305

Thermal conductivity of Solder SAC305

Solder SAC305 has a thermal conductivity of 61 W/m·K (35.2 BTU/hr·ft·°F). Basis: typical, temperature not stated. Source: Indium Corporation, Indalloy 256 (SAC305) for Preforms Product Data Sheet (100346 R0)archived copy.

Specific heat of Solder SAC305

The specific heat capacity of Solder SAC305 is 232 J/kg·K (0.0554 BTU/lb·°F). Basis: typical (MacDermid Alpha). Source: MacDermid Alpha, ALPHA Vaculoy SAC Alloys Technical Data Sheet (2023).

Coefficient of thermal expansion of Solder SAC305

Solder SAC305 expands 21.9 µm/m·K (12.2 µin/in·°F): a 100 mm part grows 110 µm over a 50 °C rise. Basis: mean, 20-100 °C (MacDermid Alpha). Source: MacDermid Alpha, ALPHA Vaculoy SAC Alloys Technical Data Sheet (2023).

Thermal diffusivity of Solder SAC305

Computed from the conductivity, density and specific heat (k / ρc): 35.8 mm²/s, how fast a temperature change spreads through it.

Melting point of Solder SAC305

Solder SAC305 melts at 217–220 °C (423–428 °F). Basis: solidus-liquidus. Source: Indium Corporation, Indalloy 256 (SAC305) for Preforms Product Data Sheet (100346 R0)archived copy.