Product Overview
The D-Series is a high-performance hybrid engineered for mission-critical applications where standard carbon fiber is too brittle. By interlacing high-modulus carbon fiber with aramid (Kevlar®) fibers, these tubes offer a unique synergy of extreme stiffness and high impact resistance. The D-Series is specifically designed to absorb energy and prevent catastrophic shattering, ensuring structural integrity even under severe mechanical stress or impact.
Kevlar tubing is specified when a component has to stay light and stiff but must also survive being dropped, struck or abraded in service. We produce these hybrid tubes to order for OEM programs, matching outside diameter, wall thickness, length and layup to your drawing.
Technical Advantages
- Superior impact toughness: While pure carbon fiber may crack upon sharp impact, the integrated Kevlar fibers act as a "toughness skeleton," dispersing energy and preventing crack propagation.
- Optimized strength-to-weight ratio: Kevlar is even lighter than carbon fiber (density ~1.44 g/cm³), making these hybrid tubes an ideal choice for ultra-lightweight structural applications where safety and durability are paramount.
- Non-catastrophic failure mode: Unlike the brittle failure of standard composites, carbon-Kevlar hybrids exhibit a more ductile failure mode, meaning the tube will likely bend or deform rather than snap into pieces.
- Exceptional abrasion and cut resistance compared to standard carbon fiber, which extends service life in poles, masts and handling equipment.
- Vibrant functional aesthetics: The natural golden hue of aramid fibers creates a distinctive bi-color weave (yellow/black, red/black or blue/black) that serves both as a premium visual identifier and a functional indicator of reinforced toughness.
D-Series Carbon Kevlar Tube Specifications
| Parameter | Specification |
|---|---|
| Outside diameter (OD) | 6 mm – 100 mm |
| Wall thickness | 0.5 mm – 3.0 mm |
| Standard length | 1000 / 1500 / 2000 mm，longer lengths to order |
| OD tolerance | ± 0.05 mm – ± 0.1 mm (diameter dependent) |
| Fiber layup | 3K carbon fiber / 1500D Kevlar® hybrid weave |
| Resin matrix | High-performance epoxy |
| Manufacturing process | Precision roll-wrapped |
| Aramid fiber density | ~1.44 g/cm³ |
| Surface finish | High-gloss UV-protective clear coat, or technical matte |
| Colour combinations | Yellow/black, red/black, blue/black |
| Profiles available | Round, square, oval, bent / curved |
| Tensile strength | 1800 MPa |
| Minimum order quantity | samples from 1 pc, custom tooling project-based |
| Sample lead time | 7–10 days |
| Production lead time | 20–25 days |
Carbon Kevlar Tube vs. Pure Carbon Fiber Tube
Buyers often ask which of the two they should specify. The short answer: choose pure carbon fiber for maximum stiffness per gram, and choose a carbon Kevlar hybrid when the part will take impact or abrasion in service.
| Property | Carbon Kevlar hybrid (D-Series) | Pure carbon fiber (B-Series) |
|---|---|---|
| Impact resistance | High — aramid fibers disperse impact energy | Moderate — prone to cracking on sharp impact |
| Failure mode | Ductile: bends or deforms | Brittle: shatters into fragments |
| Stiffness | Slightly lower than pure carbon | Highest stiffness-to-weight ratio |
| Weight | Marginally lighter (aramid ~1.44 g/cm³) | Standard |
| Abrasion & cut resistance | Excellent | Standard |
| Machinability | Harder to cut cleanly — aramid fibers fray | Cuts and machines cleanly |
| Appearance | Bi-colour woven pattern (gold/black etc.) | Uniform black 3K twill or plain weave |
| Relative cost | Higher | Lower |
| Best suited to | Impact-prone, safety-critical and visible parts | Pure stiffness applications, telescopic nesting |
If your application needs the nesting precision of a telescopic assembly rather than impact tolerance, see our pure carbon fiber tube range.
Primary Applications
- Motorsport & automotive: Protective structural braces, impact-resistant drive shafts and chassis reinforcement.
- Aerospace & defence: UAV landing gear, protective housings for sensitive electronics and portable tactical masts.
- Marine engineering: High-impact paddles, spars and structural components for racing hulls.
- Industrial robotics: Arm segments for high-speed pick-and-place robots where vibration damping and impact safety are required.
- Access & cleaning equipment: Extension poles that are repeatedly knocked against walls, frames and glazing.
Custom Profiles and Related Products
Beyond round tubing we produce the same carbon Kevlar hybrid layup in other geometries, and we supply the raw fabric if you laminate in house:
- Square carbon fiber tubes
- Oval carbon fiber tubes
- Bent and curved carbon fiber tubes
- Kevlar fabric and carbon fiber fabric
- Threaded joint connectors for assembling tube sections
Frequently Asked Questions
What is Kevlar tubing used for?
Kevlar tubing — more precisely carbon Kevlar hybrid tubing — is used where a structure must stay lightweight and stiff but also survive impact without shattering: UAV landing gear, motorsport braces, marine paddles and spars, robotic arm segments, and protective housings for sensitive electronics.
Is Kevlar tubing stronger than carbon fiber tubing?
Not in stiffness. Pure carbon fiber has a higher tensile modulus, so a pure carbon tube deflects less under the same load. Kevlar's advantage is toughness: it resists impact, abrasion and cut damage, and it fails in a ductile way instead of shattering. Hybrid tubes combine both properties — carbon provides the stiffness, aramid provides the impact tolerance.
What sizes of carbon Kevlar tube can you produce?
Standard outside diameters and wall thicknesses are listed in the specification table above. Custom OD, ID, wall thickness, length and layup are all available for OEM projects, and diameter tolerance is held to ±0.05–0.1 mm depending on size. Send us your dimensions and we will confirm feasibility.
Can you produce square, oval or bent Kevlar tubes?
Yes. Besides round tubing we produce square profiles, oval profiles and bent tubes in carbon Kevlar hybrid layup. Bent geometries require dedicated tooling, so send a drawing with the radius and angle and we will review the tooling requirement and minimum quantity.
Why is carbon Kevlar tubing more expensive than plain carbon fiber?
Aramid fiber costs more than standard carbon fiber, hybrid weaving is a slower process, and aramid is harder to cut and finish cleanly, which adds machining time. The premium is usually justified when a field failure would be expensive — warranty returns, safety exposure or equipment downtime.
What is your minimum order quantity?
【待确认】此处填你们的真实政策。建议写法：Samples of standard sizes are available in single units so you can test before committing. Custom-tooled profiles carry a project-based minimum — contact us with your specification for exact figures.
How do I request a quote?
Send us the outside diameter, the inside diameter or wall thickness, the required length, the quantity and the application. If you have a drawing or a reference sample we can review it and confirm the layup and achievable tolerance within one working day.
Request a Quote for Carbon Kevlar Tubes
We manufacture carbon Kevlar hybrid tubing to order at our own facility, which means the layup, wall thickness, tolerance and surface finish are all specified around your application rather than pulled from a fixed catalogue.
To quote, we need:
- Outside diameter
- Inside diameter or wall thickness
- Required length
- Quantity
- Application and load direction
- Surface finish preference (gloss or matte)
- Drawing, sample or reference photo, if available
If you are not sure which specification suits your application, describe how the part is loaded and where it gets knocked in service — we can recommend a layup and prepare samples for testing before bulk production.
Contact us with your specification and we will review your requirement and reply within one working day.
