Fiber comparison
E-glass fiber 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 | E-glass fiber | Flax fiber (natural) | Difference |
|---|---|---|---|
| Density | 2.54 g/cm³ | 1.5 g/cm³ | E-glass fiber — 69% higher |
| Young's modulus E | 72.4 GPa | 58 GPa | E-glass fiber — 25% higher |
| Tensile strength | 3450 MPa | 800 MPa | E-glass fiber — 4.3× higher |
Where these numbers come from
- Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.
- 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.