Kevlar 29 vs Quartz Fiber Composite
Composite · grade comparison
Kevlar 29 and Quartz Fiber Composite are both composite grades. Kevlar 29 is the stronger of the two: tensile strength 2,920 MPa (424 ksi) against 500 MPa (72.5 ksi) for Quartz Fiber Composite, about 5.8 times as much. Kevlar 29 is the more ductile: elongation 3.6% versus 2% for Quartz Fiber Composite. Kevlar 29 is lighter (1.44 g/cm³ vs 1.75 g/cm³ for Quartz Fiber Composite) and Kevlar 29 is stiffer (70.5 GPa vs 25 GPa).
Kevlar 29Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Kevlar 29 vs Quartz Fiber Composite: 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 29Quartz Fiber Composite
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Same in both: Compressive Strength 400 MPa58 ksi
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
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Limiting Oxygen Index
Max Service Temperature (short-term)
Same in both: Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Dielectric Strength
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Volume Resistivity 1×10¹⁵ Ω·cm
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 Diffusivity
Thermal Shock Resistance Index
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 | Quartz Fiber Composite |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Kevlar 29 vs Quartz Fiber Composite — frequently asked
Is Kevlar 29 stronger than Quartz Fiber Composite?
Yes. Kevlar 29 has a typical tensile strength of 2,920 MPa (424 ksi) against 500 MPa (72.5 ksi) for Quartz Fiber Composite — about 5.8 times as much.
Which is cheaper, Kevlar 29 or Quartz Fiber Composite?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Kevlar 29 over Quartz Fiber Composite?
Pick Kevlar 29 when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Kevlar 29 and Quartz Fiber Composite 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.