S-2 Glass/Epoxy unidirectional composite is a fiber-reinforced polymer consisting of high-strength S-2 glass fibers (a boron-containing variant offering improved performance over standard E-glass) embedded in an epoxy matrix, processed via autoclave prepreg for consistent quality and fiber alignment. This material is widely specified in aerospace, defense, and marine structures where the unidirectional fiber orientation maximizes load-bearing capacity along the primary stress axis, making it a workhorse for damage-tolerant primary structures that require both strength and repeatability per military specifications. Engineers select S-2 Glass/Epoxy over E-glass alternatives when thermal performance and fatigue resistance justify the higher material cost, and over carbon-fiber systems when cost, impact tolerance, or electromagnetic transparency are design drivers.
Compliance & Regulations
Fiber Direction
Ply Schedule
Laminate Code
[0]T
Fiber angles relative to the 0° reference direction (red arrow in 3D view). 0° = longitudinal, 90° = transverse, ±45° = shear paths.
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Compressive Strength(σc) | 1.034 | GPa | L | ||
Elongation at Break(εf) | 3.500 | - | — | ||
Poisson's Ratio(ν) | 0.2800 | - | notes | ||
Shear Modulus(G) | 5.500 | GPa | notes | ||
Ultimate Tensile Strength(σUTS)2 entries | 1.724 | GPa | L | ||
| ↳ | 1.860 | GPa | — | ||
Young's Modulus(E)2 entries | 52.00 | GPa | L | ||
| ↳ | 52.00 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Maximum Service Temperature(Tmax) | 453 | K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ)2 entries | 1.980 | kg/m³ | — | ||
| ↳ | 1.980 | kg/m³ | — |