Materials / Compare
Plastic PETG vs. Solder SAC305
Compare Plastic PETG 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 | 46.2MPasourcetypical2.1x stronger | 22MPasourcetypical |
| Ultimate tensile strength | 46.2MPasourcetypical, peak stress (= stress at yield) | 39.6MPasourcetypical |
| Flexural strength | 78.9MPasourcetypical | not sourced |
| Elongation at break | 7.6%sourcetypical | 49%sourcetypical6.45x more ductile |
| Young's modulus (stiffness) | 1.94GPasourcetypical | 6.9GPasourcetypical, temperature and strain rate not stated |
| Density | 1,270kg/m³sourcetypical5.79x lighter | 7,350kg/m³sourcetypical |
| Strength to weight | 36.4kN·m/kg12.2x higher | 2.99kN·m/kg |
| Stiffness to weight | 1.53MN·m/kg1.63x higher | 0.939MN·m/kg |
| Poisson's ratio | not sourced | 0.35sourcetypical |
| Shear modulus | not sourced | 2.56GPa |
| Bulk modulus | not sourced | 7.67GPa |
| Speed of sound | 1,236m/s | 969m/s |
| Thermal | ||
| Thermal conductivity | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 61W/m·Ksourcetypical, temperature not stated |
| Thermal expansion | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical | 21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha) |
| 100 mm part over a 50 °C swing | 255µm growth | 110µm growth2.33x less |
| Specific heat | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) | 232J/kg·Ksourcetypical (MacDermid Alpha) |
| Heats up and cools (diffusivity) | 0.127mm²/s | 35.8mm²/s281x faster |
| Thermal shock resistance | not sourced | 5,773W/m |
| Melting point | not sourced | 217–220°Csourcesolidus-liquidus |
| Glass transition | 77.4°Csourcetypical | not sourced |
| Max service temperature | 76.2°CsourceHDT 0.455 MPa (printed specimens) | not sourced |
| Values for | Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. | 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.
Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic PETG stronger than Solder SAC305?
Plastic PETG is stronger: its yield strength is 46.2 MPa against 22 MPa for Solder SAC305 (2.1x).
Which is lighter, Plastic PETG or Solder SAC305?
Plastic PETG is lighter: 1,270 kg/m³ against 7,350 kg/m³ for Solder SAC305.
Which is stiffer, Plastic PETG or Solder SAC305?
Solder SAC305 is stiffer: Young's modulus 6.9 GPa against 1.94 GPa for Plastic PETG, so the same part in Solder SAC305 deflects less under the same load.
Which is lighter for the same job, Plastic PETG or Solder SAC305?
For the same stiffness or strength: Plastic PETG 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 PETG | Solder SAC305 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 1.63x heavier |
| Stiff beam (bending) | lighter | 3.07x heavier |
| Stiff panel or plate | lighter | 3.79x heavier |
| Strong rod or tie | lighter | 12.2x heavier |
| Strong beam | lighter | 9.49x heavier |
| Strong panel or plate | lighter | 8.39x 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 PETG or Solder SAC305?
Solder SAC305 stretches further before it breaks: 49% elongation at break against 7.6% for Plastic PETG.
Which conducts heat better, Plastic PETG or Solder SAC305?
Solder SAC305 conducts heat better: 61 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature?
Solder SAC305 expands less: 21.9 µm/m·K against 51 µm/m·K for Plastic PETG.