Fiber comparison
Carbon fiber (AS4) vs Flax fiber (natural)
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) | Flax fiber (natural) | Difference |
|---|---|---|---|
| Density | 1.79 g/cm³ | 1.5 g/cm³ | Carbon fiber (AS4) — 19% higher |
| Young's modulus E | 231 GPa | 58 GPa | Carbon fiber (AS4) — 4.0× higher |
| Tensile strength | 4447 MPa | 800 MPa | Carbon fiber (AS4) — 5.6× higher |
Where these numbers come from
- Hexcel HexTow carbon fiber product datasheet
- Pickering, Efendy & Le, Composites Part A 83 (2016) — natural fibre review
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.