Thermoset comparison
Epoxy (DGEBA, amine-cured) vs Polyester (unsaturated, cast)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | Epoxy (DGEBA, amine-cured) | Polyester (unsaturated, cast) | Difference |
|---|---|---|---|
| Density | 1.2 g/cm³ | 1.2 g/cm³ | identical |
| Young's modulus E | 3.45 GPa | 3.2 GPa | Epoxy (DGEBA, amine-cured) — 8% higher |
| Tensile strength | 70 MPa | 55 MPa | Epoxy (DGEBA, amine-cured) — 27% higher |
| Glass transition Tg | 120 °C | 75 °C | Epoxy (DGEBA, amine-cured) — 45 °C higher |
Where these numbers come from
- Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
Typical room-temperature values for learning and preliminary design; grades vary widely and a supplier datasheet always overrides a textbook figure. Confirm against the datasheet before design work.