Material
Aramid Composite AFRP
The fiber family behind soft body armor and Nomex honeycomb. Exceptional in tension and impact, poor in compression, and the material where the buyer is usually specifying a fiber rather than a laminate.
Overview
Aramid splits into two families that behave nothing alike. Para-aramid, sold as Kevlar and Twaron, has very high tensile strength and outstanding impact and cut resistance, which makes it the basis of soft body armor and ballistic panels. Meta-aramid, sold as Nomex, is a flame resistant paper and fiber rather than a structural reinforcement, and its largest structural role is as the honeycomb core inside almost every aircraft sandwich panel. What unites them is that aramid is strong in tension and weak in compression, so it rarely carries structural load on its own; it appears as ballistic protection, as core, or hybridized with carbon or glass in a laminate.
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Defense applications
Soft body armor
Woven para-aramid is the original and still dominant soft armor material, catching and deforming a projectile across many layers. It competes directly with ultra high molecular weight polyethylene, which is lighter but has a lower melting point.
Concealable vests, Outer tactical vests, Helmet shells, Ballistic blankets
Honeycomb core
Meta-aramid paper dipped in phenolic resin forms the honeycomb core in the large majority of aircraft sandwich structure. This is quietly the highest-volume aerospace use of aramid, and it sits inside floors, fairings, control surfaces and interiors on nearly every aircraft flying.
Floor panels, Fairings and cowlings, Control surfaces, Interior panels, Nacelle structure
Spall and fragment protection
Aramid liners inside vehicle hulls catch fragments and spall generated when a round strikes the armor, protecting occupants from secondary effects rather than from the round itself.
Vehicle spall liners, Aircraft cockpit protection, Fragment curtains, Blast containment
Flame resistant textiles
Meta-aramid does not melt or drip and self-extinguishes, which is why it is the standard for flight suits, vehicle crew coveralls and firefighting gear.
Flight suits, Vehicle crew coveralls, Firefighting turnout gear, Flash protection
Alloys and grades
| Designation | Grade | Class | Notes | Typical forms |
|---|---|---|---|---|
| Kevlar 29 | Ballistic | Para-aramid, standard modulus | The original ballistic para-aramid grade, optimized for energy absorption rather than stiffness. The basis of most soft armor. | Fiber and Tow, Dry Fabric, Laminate and Panel |
| Kevlar 49 | High modulus | Para-aramid, high modulus | Higher modulus than Kevlar 29 and intended for composite reinforcement rather than soft armor. | Fiber and Tow, Dry Fabric, Prepreg |
| Nomex | Meta-aramid | Flame resistant meta-aramid supplied as fiber and as paper. The paper, dipped in phenolic resin, is the standard aerospace honeycomb core material. | Honeycomb Core, Dry Fabric | |
| Twaron | Ballistic | Para-aramid | The principal para-aramid alternative to Kevlar, produced by Teijin. Functionally comparable for most ballistic applications. | Fiber and Tow, Dry Fabric, Laminate and Panel |
Properties
| Property | Value | Unit | Note |
|---|---|---|---|
| Density, para-aramid fiber | 1.44 | g/cm3 | Lighter than both carbon and glass fiber |
| Tensile modulus, para-aramid | 70 to 130 | GPa | Varies substantially by grade; Kevlar 29 versus Kevlar 49 |
| Specific tensile strength | Very high | Roughly five times steel wire on a weight basis, which is the property armor exploits | |
| Compressive strength | Poor | Fibrillates and kinks under compression; this is the reason aramid is rarely a primary structural laminate | |
| Maximum continuous service temperature, meta-aramid | approximately 200 | degrees C | Self-extinguishing and does not melt or drip |
| Moisture absorption | High | Absorbs several percent by weight, which affects ballistic performance and requires sealed packaging | |
| Ultraviolet resistance | Poor | Degrades in sunlight; requires covering in service | |
| Machinability | Difficult | Tough fibers fray rather than cut cleanly; requires specialized shears and tooling |
Advantages
- Outstanding specific tensile strength, roughly five times steel wire by weight
- Excellent impact, cut and abrasion resistance, which is the basis of ballistic performance
- Meta-aramid is inherently flame resistant and does not melt or drip
- Lower density than both carbon and glass fiber
- Electrically insulating and non-magnetic
- As honeycomb core, delivers extremely high stiffness per unit weight in sandwich structure
Limitations
- Poor compressive strength, which rules out most primary structural use on its own
- Absorbs moisture, degrading ballistic performance unless sealed
- Degrades under ultraviolet exposure and must be covered in service
- Difficult to cut and machine cleanly; fibers fray rather than shear
- Poor adhesion to some matrix resins without surface treatment
- Ballistic-grade material is subject to export control and Berry Amendment sourcing rules
- Ultra high molecular weight polyethylene now competes directly and wins on weight in some threat classes
Governing specifications
| Designation | Body | Scope |
|---|---|---|
| NIJ Standard 0101.06 | National Institute of Justice | Ballistic resistance of body armor. The governing standard for soft armor performance classification |
| MIL-DTL-62474 | U.S. Department of Defense | Laminate, aramid reinforced plastic |
| MIL-C-83429 | U.S. Department of Defense | Cloth, ballistic, aramid |
| Berry Amendment (10 U.S.C. 4862) | United States Code | Domestic sourcing requirement for clothing, textiles and individual equipment, which captures ballistic aramid entering body armor |