Fiber comparison
S-2 glass fiber vs Carbon fiber (T300)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | S-2 glass fiber | Carbon fiber (T300) | Difference |
|---|---|---|---|
| Density | 2.46 g/cm³ | 1.76 g/cm³ | S-2 glass fiber — 40% higher |
| Young's modulus E | 86.9 GPa | 230 GPa | Carbon fiber (T300) — 2.6× higher |
| Tensile strength | 4890 MPa | 3530 MPa | S-2 glass fiber — 39% higher |
Where these numbers come from
- AGY S-2 Glass product datasheet
- 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.