Materials / Compare
Brick vs. Plastic POM/Acetal
Compare Brick vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | 69MPasourcetypical (single ASTM D638 tensile strength) |
| Ultimate tensile strength | 5.1MPasourcemodulus of rupture (no direct tensile value) | 69MPasourcetypical |
| Compressive strength | 77.9MPasourcemean unit compressive strength, solid extruded brick (survey mean; SD 30.8 MPa) | 124MPasourcecompressive stress at 10% deformation |
| Flexural strength | not sourced | 99MPasourceflexural yield strength, typical |
| Elongation at break | not sourced | 75%sourcetypical |
| Young's modulus (stiffness) | not sourced | 2.8GPasourcetypical |
| Density | 2,082kg/m³sourceface brick density row used for k (BIA notes most fired clay brick 120-130 lb/ft3) | 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 | 2.45kN·m/kg | 48.6kN·m/kg19.8x higher |
| Stiffness to weight | not sourced | 1.97MN·m/kg |
| Poisson's ratio | not sourced | 0.35sourcetypical |
| Shear modulus | not sourced | 1.04GPa |
| Bulk modulus | not sourced | 3.11GPa |
| Speed of sound | not sourced | 1,404m/s |
| Thermal | ||
| Thermal conductivity | 0.92–1.12W/m·Ksourcerange for 130 lb/ft3 face brick (ASHRAE 2013 via BIA) | 0.4W/m·Ksourcetypical |
| Thermal expansion | 7.2µm/m·KsourceTMS Code average coefficient, clay/shale unit masonry | 122µm/m·Ksourcemean, 29 to 60 °C |
| 100 mm part over a 50 °C swing | 36µm growth16.9x less | 610µm growth |
| Specific heat | 837J/kg·Ksourcevalue used in BIA heat-capacity sample calculation | 1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific) |
| Heats up and cools (diffusivity) | 0.585mm²/s3.04x faster | 0.192mm²/s |
| Thermal shock resistance | not sourced | 52.5W/m |
| Melting point | not sourced | 175°Csourcecrystalline melting point |
| Max service temperature | not sourced | 125°CsourceHDT 1.8 MPa (annealed) |
| Values for | Solid extruded clay/shale brick units (BIA 1993 manufacturer survey, TN 3A 2024); face brick of 130 lb/ft3 for thermal properties (BIA TN 4, from ASHRAE 2013); CTE is the TMS Code value for clay/shale masonry | 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 Brick stronger than Plastic POM/Acetal?
Plastic POM/Acetal is stronger: its yield strength is 69 MPa against tensile strength 5.1 MPa for Brick (13.5x).
Which is lighter, Brick or Plastic POM/Acetal?
Plastic POM/Acetal is lighter: 1,420 kg/m³ against 2,082 kg/m³ for Brick.
Which is lighter for the same job, Brick or Plastic POM/Acetal?
For the same stiffness or strength: Plastic POM/Acetal is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Brick | Plastic POM/Acetal |
|---|---|---|
| Strong rod or tie | 19.8x heavier | lighter |
| Strong beam | 8.32x heavier | lighter |
| Strong panel or plate | 5.39x 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, Brick or Plastic POM/Acetal?
Brick conducts heat better: 1.02 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.
Which expands less with temperature?
Brick expands less: 7.2 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.