Kevlar 29 vs Kevlar 49 vs Kevlar 149 vs Twaron
Benchmark · 4 materials
Side-by-side benchmark of 4 composite grades.
Kevlar 29 vs Kevlar 49 and 2 more: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all composite grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Kevlar 29Kevlar 49Kevlar 149Twaron
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Shear Strength
Same in both: Poisson's Ratio 0.36
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Max Service Temperature (short-term)
Same in both: Specific Heat Capacity 1,420 J/kg·K0.34 BTU/lb·°F · Min Service Temperature -196°C-321 °F · Limiting Oxygen Index 29%
Electrical
Conductivity and insulation.
Electrical Resistivity
Dissipation Factor (1 MHz)
Volume Resistivity
Same in both: Dielectric Constant (1 MHz) 4
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Polishability
Same in both: Machinability 25 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Shock Resistance Index
Same in both: Thermal Diffusivity 0 mm²/s
Strength versus weight
Yield strength against density for every composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Kevlar 29 | Kevlar 49 | Kevlar 149 | Twaron |
|---|---|---|---|---|
| Default condition | ||||
| Relative cost | $$$$ High | $$$$ High | $$$$ High | $$$$ High |
| Min. machined wall | ||||
| Best machined surface |
Ready to make it?
Upload a CAD file and FabDigit prices the part in Kevlar 29 and Kevlar 49 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.