Materials / Compare
Brass C360 vs. Plastic POM/Acetal
Compare Brass C360 vs. Plastic POM/Acetal 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 | 310MPasourcetypical, 0.5% extension under load | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 400MPasourcetypical5.8x stronger | 69MPasourcetypical |
| Compressive strength | not sourced | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | not sourced | 99MPasourceflexural yield strength, typical |
| Elongation at break | 25%sourcetypical, 1 in. rod | 75%sourcetypical |
| Young's modulus (stiffness) | 96.5GPasourcetypical, temper-independent | 2.8GPasourcetypical |
| Density | 8,498kg/m³sourcenominal | 1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties') |
| Strength to weight | 36.5kN·m/kg | 48.6kN·m/kg33% higher |
| Stiffness to weight | 11.4MN·m/kg5.76x higher | 1.97MN·m/kg |
| Poisson's ratio | 0.34sourcebase material: leaded free-machining brass CuZn39Pb2 (C37700), Wieland-Z30 rolled products, reference value at room temperature | 0.35sourcetypical |
| Shear modulus | 36GPa34.7x stiffer in shear | 1.04GPa |
| Bulk modulus | 101GPa | 3.11GPa |
| Speed of sound | 3,370m/s | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 116W/m·Ksourcetypical, 20 °C | 0.4W/m·Ksourcetypical |
| Thermal expansion | 20.5µm/m·Ksourcetypical, mean 20-300 °C | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 103µm growth5.95x less | 610µm growth |
| Specific heat | 377J/kg·Ksourcetypical, 20 °C | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) |
| Heats up and cools (diffusivity) | 36.2mm²/s188x faster | 0.192mm²/s |
| Thermal shock resistance | 11,997W/m228x more resistant | 52.5W/m |
| Melting point | 888–899°Csourcesolidus-liquidus | 175°Csourcecrystalline melting point |
| Max service temperature | not sourced | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values | DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com |
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 Brass C360 stronger than Plastic POM/Acetal?
Brass C360 is stronger: its yield strength is 310 MPa against 69 MPa for Plastic POM/Acetal (4.49x).
Which is lighter, Brass C360 or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 8,498 kg/m³ for Brass C360.
Which is stiffer, Brass C360 or Plastic POM/Acetal?
Brass C360 is stiffer: Young's modulus 96.5 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Brass C360 deflects less under the same load.
Which is lighter for the same job, Brass C360 or Plastic POM/Acetal?
For the same stiffness or strength: Brass C360 is lighter for a stiff rod or tie (tension); Plastic POM/Acetal is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Brass C360 | Plastic POM/Acetal |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 5.76x heavier |
| Stiff beam (bending) | 2% heavier | lighter |
| Stiff panel or plate | 1.84x heavier | lighter |
| Strong rod or tie | 33% heavier | lighter |
| Strong beam | 2.2x heavier | lighter |
| Strong panel or plate | 2.82x heavier | lighter |
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 conducts heat better, Brass C360 or Plastic POM/Acetal?
Brass C360 conducts heat better: 116 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Brass C360 expands less: 20.5 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.