Kevlar · reinforced grade
Kevlar Woven Fabric
Properties of the Woven Fabric condition, compared with the other Kevlar grades.
Choose for balanced 0/90 in-plane properties, drapeable complex shapes, canoe/helmet/panel skins; lower strength than UD due to crimp.
What is Kevlar Woven Fabric?
Kevlar Woven Fabric is Kevlar in the Woven Fabric grade — choose for balanced 0/90 in-plane properties, drapeable complex shapes, canoe/helmet/panel skins; lower strength than UD due to crimp. Kevlar Woven Fabric has a tensile strength of 520 MPa (75.4 ksi), stronger than 65% of composite grades. Elongation at break is 2% and the elastic modulus is 30 GPa (4.35 Msi). Kevlar Woven Fabric has a density of 1.35 g/cm³ (0.0488 lb/in³), lighter than 76% of composite grades. Its glass-transition temperature is 135°C (275 °F). Epoxy Matrix is the default condition FabDigit quotes; Woven Fabric is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 35 MPa·√m (31.9 ksi·√in), better than 93% of composite grades
- Lightweight — 1.35 g/cm³ (0.0488 lb/in³), better than 76% of composite grades
Limitations
- Degrades in UV without stabilisers — 25/100, worse than 86% of composite grades
- Limited service temperature — 120°C (248 °F), worse than 79% of composite grades
- Difficult to machine — 20/100, worse than 77% of composite grades
Kevlar Woven Fabric properties
Typical room-temperature values for Kevlar Woven Fabric — 10 properties are specific to this condition; the rest are grade-level values shared by every Kevlar grade. Each bar shows where the value sits among the composite grades in FabDigit's library — further right is higher.
Physical4
Kevlar Woven Fabric has a density of 1.35 g/cm³ (0.0488 lb/in³), lighter than 76% of composite grades. Its glass-transition temperature is 135°C (275 °F).
Mechanical12
Kevlar Woven Fabric has a tensile strength of 520 MPa (75.4 ksi), stronger than 65% of composite grades. Elongation at break is 2% and the elastic modulus is 30 GPa (4.35 Msi).
Thermal9
Kevlar Woven Fabric is rated for continuous service to 120°C (248 °F). It conducts heat at 0.5 W/m·K (0.289 BTU/hr·ft·°F), better than 54% of composite grades. Thermal expansion is 1 µm/m·K (0.556 µin/in·°F).
Electrical5
Kevlar Woven Fabric is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 54% of composite grades. UV resistance is poor.
Sustainability3
Producing a kilogram of Kevlar Woven Fabric takes about 250 MJ of energy and emits 14 kg of CO₂ — more than 53% of composite grades. Typical recycled content is 0%.
Manufacturability2
Kevlar Woven Fabric's machinability is poor (20/100, worse than 77% of composite grades).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Kevlar grades and fills
Kevlar is also supplied in 7 other conditions. The full side-by-side table is on the Kevlar overview.
- Epoxy MatrixDefaultDefault structural aramid composite: best stiffness/strength and adhesion, for aerospace panels, filament-wound vessels and marine hulls up to ~120 °C.1,350 MPa tensile
- Vinyl Ester MatrixMarine and corrosion service: cheaper wet-layup/infusion than epoxy, better hydrolysis resistance than polyester, slightly weaker bond to aramid.1,150 MPa tensile
- Woven FabricChoose for balanced 0/90 in-plane properties, drapeable complex shapes, canoe/helmet/panel skins; lower strength than UD due to crimp.520 MPa tensile
- Phenolic MatrixAircraft interiors, ducting and Nomex-type honeycomb faces where FAR 25.853 fire/smoke/toxicity and V-0 rating dominate over strength.450 MPa tensile
- TP MatrixStampable, weldable and re-formable aramid composite for high-rate parts and impact liners; lower stiffness and creep resistance than epoxy.450 MPa tensile
Working with Kevlar Woven Fabric
Is Kevlar easy to machine?
Fibers do not cut cleanly — use sharp carbide/PCD shear-angle or serrated 'Kevlar' router bits, back-up plates, or waterjet/laser trimming to avoid fuzzing and delamination.
Can Kevlar be welded?
Thermoset epoxy laminates cannot be welded; join by secondary bonding with film/paste adhesive or bolted joints with bushed holes (thermoplastic-matrix variants can be resistance or ultrasonic welded).
Can Kevlar be formed, bent or molded?
Processed as prepreg autoclave/oven cure (120–180 °C), resin infusion/RTM, wet layup or filament winding; aramid fabric drapes well but must be dried before cure to avoid moisture-induced porosity.
What surface finishes work on Kevlar?
Cut edges must be sealed with resin or edge tape; paint or gel-coat with UV-blocking pigment is essentially mandatory for outdoor service, and surfacing film gives a smooth paintable skin.
Kevlar chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| para-aramid fiber (PPTA, poly-p-phenylenfiber volume fraction ≈ 55–62 % for prepreg laminates | 50 – 65 | 60 |
| sizing / finishfiber surface treatment for adhesion | 0.1 – 1 | 0.5 |
| epoxy resin (DGEBA / amine or dicyandiammatrix; substituted by vinyl ester, phenolic or thermoplastic in other variants | ≥ 35 (balance) | — |
Kevlar Woven Fabric — frequently asked
What is Kevlar Woven Fabric used for?
Kevlar Woven Fabric is typically used for body armor, ballistic panels, aerospace interior and secondary structure panels, filament-wound pressure vessel overwraps, boat hulls and impact skins and sports equipment shells. In short: aramid impact laminate.
What is the tensile strength of Kevlar Woven Fabric?
Kevlar Woven Fabric has a typical tensile strength of 520 MPa (75.4 ksi) — stronger than 65% of composite grades. Strength varies by condition: see the 8 listed tempers.
Is Kevlar Woven Fabric easy to machine?
Not especially — machinability is rated poor (20/100, worse than 77% of composite grades). Fibers do not cut cleanly — use sharp carbide/PCD shear-angle or serrated 'Kevlar' router bits, back-up plates, or waterjet/laser trimming to avoid fuzzing and delamination.
Can Kevlar Woven Fabric be welded?
Thermoset epoxy laminates cannot be welded; join by secondary bonding with film/paste adhesive or bolted joints with bushed holes (thermoplastic-matrix variants can be resistance or ultrasonic welded).
What surface finishes work on Kevlar Woven Fabric?
Cut edges must be sealed with resin or edge tape; paint or gel-coat with UV-blocking pigment is essentially mandatory for outdoor service, and surfacing film gives a smooth paintable skin.
Can Kevlar Woven Fabric be formed, bent or molded?
Processed as prepreg autoclave/oven cure (120–180 °C), resin infusion/RTM, wet layup or filament winding; aramid fabric drapes well but must be dried before cure to avoid moisture-induced porosity.
What is the maximum service temperature of Kevlar Woven Fabric?
Kevlar Woven Fabric is rated for continuous use to about 120°C (248 °F), and briefly to 200°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Kevlar Woven Fabric?
Yes — Kevlar Woven Fabric is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Kevlar Aramid Fiber Technical Guide — DuPont (2017)
- ASM Handbook Vol. 21 — Composites — ASM International (2001)
- CMH-17 (MIL-HDBK-17) Composite Materials Handbook, Vol. 3 Polymer Matrix Composites — SAE International / CMH-17 (2012)
- Aramid fabric prepreg datasheets — Hexcel / Toray Advanced Composites (2022)
- CES EduPack material data — aramid fiber reinforced epoxy — Granta/Ansys (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.