Fiber comparison
Carbon fiber (AS4) vs Basalt 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) | Basalt fiber | Difference |
|---|---|---|---|
| Density | 1.79 g/cm³ | 2.67 g/cm³ | Basalt fiber — 49% higher |
| Young's modulus E | 231 GPa | 89 GPa | Carbon fiber (AS4) — 2.6× higher |
| Tensile strength | 4447 MPa | 2900 MPa | Carbon fiber (AS4) — 53% higher |
Where these numbers come from
- Hexcel HexTow carbon fiber product datasheet
- Fiore et al., Composites Part B 74 (2015) — basalt 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.