Materials / Compare
Brass C260 vs. Plastic POM/Acetal
Compare Brass C260 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 | 345MPasourcenominal, strip/flat, 0.5% extension (not 0.2% offset) | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 427MPasourcenominal, strip/flat | 69MPasourcetypical |
| Compressive strength | not sourced | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | not sourced | 99MPasourceflexural yield strength, typical |
| Elongation at break | 23%sourcenominal, in 2.0 in., strip/flat | 75%sourcetypical |
| Young's modulus (stiffness) | 110GPasourcetypical, temper-independent | 2.8GPasourcetypical |
| Density | 8,525kg/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 | 40.5kN·m/kg | 48.6kN·m/kg20% higher |
| Stiffness to weight | 12.9MN·m/kg6.56x higher | 1.97MN·m/kg |
| Poisson's ratio | 0.34sourcereference value at room temperature (Wieland-M30 = CuZn30 = C26000, rolled products) | 0.35sourcetypical |
| Shear modulus | 41.2GPa39.7x stiffer in shear | 1.04GPa |
| Bulk modulus | 115GPa | 3.11GPa |
| Speed of sound | 3,597m/s | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 121W/m·Ksourcetypical, 20 °C | 0.4W/m·Ksourcetypical |
| Thermal expansion | 20µm/m·Ksourcetypical, mean 20-300 °C | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 100µm growth6.1x 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) | 37.7mm²/s196x faster | 0.192mm²/s |
| Thermal shock resistance | 12,510W/m238x more resistant | 52.5W/m |
| Melting point | 916–954°Csourcesolidus-liquidus | 175°Csourcecrystalline melting point |
| Max service temperature | not sourced | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | C26000 cartridge brass, H02 half hard flat/strip: CDA Electronic Connector Design Guide (mechanical) + CDA alloy page (physical) | 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 C260 stronger than Plastic POM/Acetal?
Brass C260 is stronger: its yield strength is 345 MPa against 69 MPa for Plastic POM/Acetal (5x).
Which is lighter, Brass C260 or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 8,525 kg/m³ for Brass C260.
Which is stiffer, Brass C260 or Plastic POM/Acetal?
Brass C260 is stiffer: Young's modulus 110 GPa against 2.8 GPa for Plastic POM/Acetal, so the same part in Brass C260 deflects less under the same load.
Which is lighter for the same job, Brass C260 or Plastic POM/Acetal?
For the same stiffness or strength: Brass C260 is lighter for a stiff rod or tie (tension), stiff beam (bending); Plastic POM/Acetal is lighter for a stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Brass C260 | Plastic POM/Acetal |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 6.56x heavier |
| Stiff beam (bending) | lighter | 5% heavier |
| Stiff panel or plate | 1.76x heavier | lighter |
| Strong rod or tie | 20% heavier | lighter |
| Strong beam | 2.05x heavier | lighter |
| Strong panel or plate | 2.68x 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 C260 or Plastic POM/Acetal?
Brass C260 conducts heat better: 121 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Brass C260 expands less: 20 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.