Fiber comparison
Basalt fiber vs Aramid fiber (Kevlar 49)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | Basalt fiber | Aramid fiber (Kevlar 49) | Difference |
|---|---|---|---|
| Density | 2.67 g/cm³ | 1.44 g/cm³ | Basalt fiber — 85% higher |
| Young's modulus E | 89 GPa | 131 GPa | Aramid fiber (Kevlar 49) — 47% higher |
| Tensile strength | 2900 MPa | 3620 MPa | Aramid fiber (Kevlar 49) — 25% higher |
Where these numbers come from
- Fiore et al., Composites Part B 74 (2015) — basalt fibre review
- 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.