Kevlar 49 vs Twaron
Composite · grade comparison
Kevlar 49 and Twaron are both composite grades. Twaron is the more ductile: elongation 3.6% versus 2.4% for Kevlar 49. Kevlar 49 is stiffer (112 GPa vs 70 GPa) and Twaron runs hotter in service (180°C vs 160°C continuous).
TwaronChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Kevlar 49 vs Twaron: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Shear Strength
Same in both: Shear Modulus 2.9 GPa0.42 Msi · Poisson's Ratio 0.36
Physical
Density and transition temperatures.
Glass Transition (Tg)
Water Absorption (Saturation)
Water Absorption (24 h)
Same in both: Density 1.44 g/cm³0.05 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
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% · Max Service Temperature (short-term) 250°C482 °F
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
Same in both: UV / Weathering Resistance 20 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 25 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 280 MJ/kg120,378 BTU/lb · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Same in both: Thermal Diffusivity 0 mm²/s · Thermal Shock Resistance Index -1
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 49 | Twaron |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Kevlar 49 vs Twaron — frequently asked
What is the difference between Kevlar 49 and Twaron?
Kevlar 49 and Twaron are both composite grades. Twaron is the more ductile: elongation 3.6% versus 2.4% for Kevlar 49. Kevlar 49 is stiffer (112 GPa vs 70 GPa) and Twaron runs hotter in service (180°C vs 160°C continuous).
Which is cheaper, Kevlar 49 or Twaron?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Kevlar 49 over Twaron?
Pick Twaron when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Kevlar 49 and Twaron 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.