Materials / Compare
Plastic POM/Acetal vs. Solder SAC305
Compare Plastic POM/Acetal vs. Solder SAC305 strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 69MPasourcetypical (single ASTM D638 tensile strength) | 22MPasourcetypical |
| Ultimate tensile strength | 69MPasourcetypical1.74x stronger | 39.6MPasourcetypical |
| Compressive strength | 124MPasourcecompressive stress at 10% deformation | not sourced |
| Flexural strength | 99MPasourceflexural yield strength, typical | not sourced |
| Elongation at break | 75%sourcetypical1.53x more ductile | 49%sourcetypical |
| Young's modulus (stiffness) | 2.8GPasourcetypical | 6.9GPasourcetypical, temperature and strain rate not stated |
| Density | 1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties') | 7,350kg/m³sourcetypical |
| Strength to weight | 48.6kN·m/kg16.2x higher | 2.99kN·m/kg |
| Stiffness to weight | 1.97MN·m/kg2.1x higher | 0.939MN·m/kg |
| Poisson's ratio | 0.35sourcetypical | 0.35sourcetypical |
| Shear modulus | 1.04GPa | 2.56GPa2.46x stiffer in shear |
| Bulk modulus | 3.11GPa | 7.67GPa |
| Speed of sound | 1,404m/s | 969m/s |
| Thermal | ||
| Thermal conductivity | 0.4W/m·Ksourcetypical | 61W/m·Ksourcetypical, temperature not stated |
| Thermal expansion | 122µm/m·Ksourcemean, 29 to 60 °C | 21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha) |
| 100 mm part over a 50 °C swing | 610µm growth | 110µm growth5.57x less |
| Specific heat | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) | 232J/kg·Ksourcetypical (MacDermid Alpha) |
| Heats up and cools (diffusivity) | 0.192mm²/s | 35.8mm²/s186x faster |
| Thermal shock resistance | 52.5W/m | 5,773W/m110x more resistant |
| Melting point | 175°Csourcecrystalline melting point | 217–220°Csourcesolidus-liquidus |
| Max service temperature | 125°CsourceHDT 1.8 MPa (annealed) | not sourced |
| Values for | DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com | 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 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.
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.