Fiber

E-glass fiber

Standard reinforcement glass fiber; isotropic, economical, moderate stiffness.

Property	Value	Source	Method	Conditions	Note
Density	2.54 g/cm³	Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.	—	23 °C, dry	—
Young's modulus E	72.4 GPa	Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.	—	23 °C, dry	isotropic
Tensile strength	3450 MPa	Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.	—	23 °C, dry	virgin filament; in-composite strength lower

Compare with

E-glass fiber vs Carbon fiber (T300)

E-glass fiber vs Aramid fiber (Kevlar 49)

E-glass fiber vs S-2 glass fiber

E-glass fiber vs Carbon fiber (AS4)

E-glass fiber vs Carbon fiber (IM7)

E-glass fiber vs Basalt fiber

Sources

Daniel & Ishai, Engineering Mechanics of Composite Materials, 2nd ed.

Typical room-temperature values for learning and preliminary design; grades vary. Always confirm against the supplier datasheet before design work. Data policy: docs/DATA-SOURCES.md in the repository.