Kevlar 49/Epoxy Unidirectional (MIL-HDBK-17)

Verifiedcomposite
· Kevlar 49/Epoxy UD· K49/Epoxy

Kevlar 49/Epoxy unidirectional composite is a fiber-reinforced polymer made from DuPont Kevlar 49 aramid fibers aligned in a single direction (0°) and bonded in an epoxy matrix using prepreg layup manufacturing. This material balances exceptional tensile strength-to-weight ratio with impact resistance and damping characteristics inherent to aramid fibers, making it well-suited for applications demanding lightweight structural performance without the brittleness of carbon fiber composites. It is widely specified in aerospace, defense, and sporting goods industries where impact tolerance, vibration damping, and damage resistance outweigh the need for maximum stiffness, and its unidirectional ply format allows engineers to build custom laminate schedules for directional load optimization.

aerospace structural componentsimpact-resistant armor and protective systemssporting goods (helmets, paddles, protective gear)rotor blades and helicopter structuresmarine hulls and pressure vesselsvibration damping applications

Compliance & Regulations

?Conflict Free?FDA?RoHS?REACH?TSCA?Prop 65
Units:
siimperial
Composite Layup1 ply · 0.13 mm total

Fiber Direction

+0°
Drag to rotate · Scroll to zoom · → = 0° reference
FiberDuPont Kevlar 49 Aramid
MatrixEpoxy
ProcessPrepreg layup
Vf60%

Ply Schedule

+0°Kevlar 49/Epoxy0.125 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)
60.05
ksiL
Poisson's Ratio(ν)
0.3400
-notes
Shear Modulus(G)
300.2
ksinotes
Ultimate Tensile Strength(σUTS)
4.351
ksiT
Young's Modulus(E)
11,022.9
ksiL
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Coefficient of Thermal Expansion(α (CTE))
30.00
µin/in·°FT
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Density(ρ)
0.04986
lb/in³—
Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

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.