Fiber comparison
Carbon fiber (AS4) vs S-2 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) | S-2 glass fiber | Difference |
|---|---|---|---|
| Density | 1.79 g/cm³ | 2.46 g/cm³ | S-2 glass fiber — 37% higher |
| Young's modulus E | 231 GPa | 86.9 GPa | Carbon fiber (AS4) — 2.7× higher |
| Tensile strength | 4447 MPa | 4890 MPa | S-2 glass fiber — 10% higher |
Where these numbers come from
- Hexcel HexTow carbon fiber product datasheet
- AGY S-2 Glass product datasheet
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.