Thermoset comparison
Polyester (unsaturated, cast) vs Vinyl ester
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | Polyester (unsaturated, cast) | Vinyl ester | Difference |
|---|---|---|---|
| Density | 1.2 g/cm³ | 1.12 g/cm³ | Polyester (unsaturated, cast) — 7% higher |
| Young's modulus E | 3.2 GPa | 3.2 GPa | identical |
| Tensile strength | 55 MPa | 86 MPa | Vinyl ester — 56% higher |
| Glass transition Tg | 75 °C | 120 °C | Vinyl ester — 45 °C higher |
Where these numbers come from
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
- Ashland Derakane 411 epoxy vinyl ester resin datasheet
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.