IM7/8551-7 Unidirectional Tape (MIL-HDBK-17)

Verifiedcomposite
· IM7/8551-7· Cytec 8551-7

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.

aircraft primary structures (wings, fuselage)aerospace compositesdamage-tolerant designhigh-performance sporting goodsspace launch structuresindustrial automation components

Compliance & Regulations

?ITAR?EAR?Conflict Free?FDA?RoHS?REACH?TSCA?Prop 65
Units:
siimperial
Composite Layup1 ply · 0.14 mm total

Fiber Direction

+0°
Drag to rotate · Scroll to zoom · → = 0° reference
FiberHexcel IM7 Carbon (12K)
MatrixCytec 8551-7 Toughened Epoxy
ProcessAutoclave prepreg (350°F cure)
Cure177°C / 120 min / 0.59 MPa
Vf60%

Ply Schedule

+0°IM7/8551-70.142 mm

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 OverviewNormalized to typical max values
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Orientation
PropertyValueUnitConditionsSource
Compressive Strength(σc)
241.0
MPaT
Poisson's Ratio(ν)
0.3400
-notes
Shear Modulus(G)
5.300
GPanotes
Ultimate Tensile Strength(σUTS)
2.668
GPaL
Young's Modulus(E)
163.0
GPaL
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Glass Transition Temperature(Tg)
470
Knotes
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Density(ρ)
1.570
kg/m³—
Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Export Control

Safety & Biocompatibility

Quality & Standards

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.