Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com
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).
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
3
Delrin 100 Product Data SheetDuPontPlastic POM/Acetal · Density: typical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')
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)
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 Plastic POM/Acetal stronger than Solder SAC305?
Plastic POM/Acetal is stronger: its yield strength is 69 MPa against 22 MPa for Solder SAC305 (3.14x).
Which is lighter, Plastic POM/Acetal or Solder SAC305?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 7,350 kg/m³ for Solder SAC305.
Which is stiffer, Plastic POM/Acetal or Solder SAC305?
Solder SAC305 is stiffer: Young's modulus 6.9 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Solder SAC305 deflects less under the same load.
Which is lighter for the same job, Plastic POM/Acetal or Solder SAC305?
For the same stiffness or strength: Plastic POM/Acetal 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
Plastic POM/Acetal
Solder SAC305
Stiff rod or tie (tension)
lighter
2.1x heavier
Stiff beam (bending)
lighter
3.3x heavier
Stiff panel or plate
lighter
3.83x heavier
Strong rod or tie
lighter
16.2x heavier
Strong beam
lighter
11.1x heavier
Strong panel or plate
lighter
9.17x 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 is more ductile, Plastic POM/Acetal or Solder SAC305?
Plastic POM/Acetal stretches further before it breaks: 75% elongation at break against 49% for Solder SAC305.
Thermal
Which conducts heat better, Plastic POM/Acetal or Solder SAC305?
Solder SAC305 conducts heat better: 61 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Solder SAC305 expands less: 21.9 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.