AS4 is a continuous carbon fiber produced by Hexcel, widely recognized as an industry-standard intermediate-modulus fiber for polymer matrix composites. It is the workhorse reinforcement in aerospace structures, wind turbine blades, and high-performance sporting goods, chosen for its balance of stiffness, strength, and cost-effectiveness compared to higher-modulus alternatives like IM7 or HS40. Engineers select AS4 when moderate-to-high structural performance is required without the weight or cost penalty of premium fibers, making it the most common choice for primary aircraft structures and demanding composite applications.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 1.850 | - | — | ||
Poisson's Ratio(ν) | 0.2000 | - | — | ||
Ultimate Tensile Strength(σUTS) | 4.275 | GPa | — | ||
Young's Modulus(E) | 231.0 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Coefficient of Thermal Expansion(α (CTE)) | -7.000e-7 | 1/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 1.790 | kg/m³ | — |