Drywall vs. Solder SAC305

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

Mechanical	Drywall	Solder SAC305
Yield strength	not given (tensile used)	22MPa1
Ultimate tensile strength	1–2MPa2	39.6MPa1
Compressive strength	2.4MPa3	not sourced
Elongation at break	not sourced	49%1
Young's modulus (stiffness)	1–2GPa2	6.9GPa1
Density	not sourced	7,350kg/m³1
Strength to weight	not sourced	2.99kN·m/kg
Stiffness to weight	not sourced	0.939MN·m/kg
Poisson's ratio	not sourced	0.351
Shear modulus	not sourced	2.56GPa
Bulk modulus	not sourced	7.67GPa
Speed of sound	not sourced	969m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal	Drywall	Solder SAC305
Thermal conductivity	not sourced	61W/m·K1
Thermal expansion	16.7µm/m·K331% less	mean21.9µm/m·K4
100 mm part over a 50 °C swing	83.5µm growth31% less	110µm growth
Specific heat	1,090J/kg·K34.7x higher	232J/kg·K4
Heats up and cools (diffusivity)	not sourced	35.8mm²/s
Thermal shock resistance	not sourced	5,773W/m
Melting point	not sourced	solidus-liquidus217–220°C1
Max service temperature	52°C5	not sourced

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

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Sources5 documents: Indium Corporation, USDA Forest Products Laboratory, Gypsum Association, MacDermid Alpha, USG

Drywall: 1/2 in. (12.7 mm) regular gypsum board (ASTM C1396), Gypsum Association GA-235-2019 typical/minimum properties; tensile and E from USDA FPL-co-authored review; service limit from USG Sheetrock 1/2 in. submittal
Solder SAC305: 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 copySolder SAC305 · Yield strength: typicalSolder SAC305 · Ultimate tensile strength: typicalSolder SAC305 · Elongation at break: typicalSolder SAC305 · Young's modulus (stiffness): typical, temperature and strain rate not statedSolder SAC305 · Density: typicalSolder SAC305 · Poisson's ratio: typicalSolder SAC305 · Thermal conductivity: typical, temperature not statedSolder SAC305 · Melting point: solidus-liquidus
2
Mechanical Properties of Gypsum Board at Elevated TemperaturesUSDA Forest Products LaboratoryDrywall · Ultimate tensile strength: ambient range reported in review (Australian studies)Drywall · Young's modulus (stiffness): ambient range reported in review (Australian studies)
3
GA-235-2023 Gypsum Board Typical Mechanical and Physical PropertiesGypsum AssociationDrywall · Compressive strength: typical, 70 F / 50% RHDrywall · Thermal expansion: typical, unrestrained, 3.3-32 CDrywall · Specific heat: typical (from ASHRAE Handbook of Fundamentals, per GA)
4
ALPHA Vaculoy SAC Alloys Technical Data Sheet (2023)MacDermid AlphaSolder SAC305 · Thermal expansion: mean, 20-100 °C (MacDermid Alpha)Solder SAC305 · Specific heat: typical (MacDermid Alpha)
5
Sheetrock Brand UltraLight Panels Submittal Sheet (WB2501)USGarchived copyDrywall · Max service temperature: manufacturer sustained-exposure limit

Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Mechanical

Is Drywall stronger than Solder SAC305?

Solder SAC305 is stronger: its yield strength is 22 MPa against tensile strength 1.5 MPa for Drywall (14.7x).

Which is stiffer, Drywall or Solder SAC305?

Solder SAC305 is stiffer: Young's modulus 6.9 GPa against 1.5 GPa for Drywall, so the same part in Solder SAC305 deflects less under the same load.

Thermal

Which expands less with temperature?

Drywall expands less: 16.7 µm/m·K against 21.9 µm/m·K for Solder SAC305.