IM7/8551-7 is a carbon fiber/epoxy prepreg composite consisting of Hexcel's high-strength IM7 carbon fibers in a toughened Cytec 8551-7 epoxy matrix, supplied as unidirectional tape for autoclave processing. This material combines excellent fiber properties with a damage-tolerant resin system, making it a workhorse for aerospace structures requiring high stiffness, strength, and impact resistance in a production-friendly format. Engineers select it over standard epoxy composites when damage tolerance and processing robustness are critical, and over other IM7 formulations when both hot-wet performance and toughness matter.
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) | 34.95 | ksi | T | ||
Poisson's Ratio(ν) | 0.3400 | - | notes | ||
Shear Modulus(G) | 768.7 | ksi | notes | ||
Ultimate Tensile Strength(σUTS) | 387 | ksi | L | ||
Young's Modulus(E) | 23,641.2 | ksi | L |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Glass Transition Temperature(Tg) | 386.3 | °F | notes |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.05672 | lb/in³ | — |