Fiber comparison
Carbon fiber (AS4) vs E-glass fiber
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | Carbon fiber (AS4) | E-glass fiber | Difference |
|---|---|---|---|
| Density | 1.79 g/cm³ | 2.54 g/cm³ | E-glass fiber — 42% higher |
| Young's modulus E | 231 GPa | 72.4 GPa | Carbon fiber (AS4) — 3.2× higher |
| Tensile strength | 4447 MPa | 3450 MPa | Carbon fiber (AS4) — 29% higher |
Where these numbers come from
- Hexcel HexTow carbon fiber product datasheet
- Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd 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.