High Tensile and Modulus Unidirectional Round Shaped Pultruded Carbon Fiber Tube

High Tensile and Modulus Unidirectional Round Shaped Pultruded Carbon Fiber Tube

Pultruded carbon fiber tubes are manufactured through a continuous process called pultrusion, in which carbon fiber tows are pulled through a heated die impregnated with resin. This process produces tubes with fibers aligned in a single direction, resulting in exceptional strength and stiffness along the length of the tube.

Pultruded carbon fiber tubes are high-performance composite tubes made using the pultrusion process, where continuous carbon fiber strands are pulled through a resin bath and a heated die to form a solid, uniform structure. This method ensures consistent quality, precise dimensions, and outstanding mechanical performance.

Unlike roll-wrapped carbon fiber tubes, which have fibers laid at multiple angles, pultruded tubes feature unidirectional fiber alignment (mostly 0° along the tube length). This design gives them superior longitudinal strength and stiffness, making them ideal for load-bearing or structural applications that demand minimal flex.

LIJIN carbon fiber is a professional manufacturer and supplier of carbon fiber pultruded tubing. We offer the premium-quality pultruded carbon fiber tubes in various sizes and lengths. Pultruded carbon tubes are made from 100% real carbon fiber and vinyl ester or epoxy resins.

High-performance pultruded carbon fiber tubes featuring 100% longitudinal fiber alignment and 134 GPa tensile modulus. These lightweight structural components deliver exceptional axial stiffness with 65-70% fiber volume fraction, making them ideal for aerospace, robotics, and precision automation applications.

All our Pultruded carbon fiber tubes are made using 3K carbon fiber and epoxy/vinyl-ester resin. Standard lengths are 1, 1.2 & 1.5 meters, but are not limited to these. Even though there’s no maximum limit on length, we don’t suggest longer than 3 meters due to transportation limitations.

FEATURES

• High Axial Strength – Due to unidirectional fiber orientation, ideal for applications requiring high tensile strength and rigidity.

• Lightweight – Offers excellent strength-to-weight ratio, reducing overall structure weight.

• Corrosion Resistant – Immune to rust, moisture, and most chemicals, ensuring long service life.

• Dimensional Stability – Maintains shape and performance under temperature and load variations.

• Cost-Effective – Pultrusion enables efficient, continuous production for consistent quality and lower costs.

Advantages

1. Exceptional Tensile Strength – The unidirectional carbon fibers provide very high strength along the tube’s axis, outperforming metals like aluminum and steel in strength-to-weight ratio.
2. Ultra-Lightweight – Carbon fiber is about five times lighter than steel while maintaining excellent rigidity, making it perfect for lightweight structures.
3. Corrosion & Chemical Resistance – Resistant to moisture, acids, and most chemicals, ensuring longevity in harsh environments.
4. Thermal Stability – Low thermal expansion and good heat resistance allow the tube to retain shape and performance in varying temperatures.
5. Smooth Finish & Consistent Quality – Pultrusion delivers a clean surface and accurate dimensions, suitable for precise engineering applications.
6. Electrical Non-Conductivity (Optional) – Depending on the resin system used, pultruded tubes can be tailored for electrical insulation purposes.

Pultrusion Process

Pultruded products are made by pulling continuous carbon fibers combined with a resin matrix through a shaped die to create the required profile. The dimension of the pultrusion die determines the shape and size of the finished profile, such as round, square, rectangular, triangle, octagon, etc, and hollow tubes, solid rods, L profile, U-shape, custom parts. Pultruded round carbon fibre tubes are created by pulling linearly-oriented carbon fibers through a resin bath and the die to form the specified inner and outer diameters ofthe pultruded hollow tube.

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The pultrusion process is usually used for producing continuous lengths of fiberglass or carbon fiber composite products with constant cross-sections.

Shanghai Lijin focuses on the Carbon Fiber industry and offers carbon fiber tubes, plates, and aluminum CNC services.

Being experienced in the carbon fiber applications for over 7 years, Shanghai Lijin manages customized production according to various industry standards. Shanghai Lijin started to keep in stock for some standard

sized and frequently ordered tubes and plates. This enables Shanghai Lijin to make prompt delivery. Not only

can Shanghai Lijin complete mass production orders in short period, we can even ship normal sample, prototype orders of Carbon Fiber Plate CNC parts in just SEVEN days after order confirmation when the

drawings are available. Shanghai Lijin is dedicated to solve any technical points during the production and new item developing to ensure the quality.

Carbon Fiber tube production is Shanghai Lijin’s core business and occupies 70% of our turnover.
The carbon fiber tubes Shanghai Lijin mainly produce is table-rolled and oven thermoset. The tubes can be Full Carbon or Carbon Fiber and Fiberglass composite, depending on the application, weight limit,mechanical

strength and surface requirement.Shanghai Lijin offers top quality ROUND carbon fiber tubes. The general OD tolerance we achieve is +/-0.10mm and it can be even +/-0.05mm after our special surface process.

The maximum length of the tube can be 5500mm.

Besides the traditional table-rolled carbon fiber tubes, Shanghai Lijin also offers REAL Filament wound carbon fiber tubes,which are widely used for mechanical strength like auto driving shaft, antennas, even for military

applications. The filament wound carbon tubes are wound at a certain angle like 30 or 45 degree. We invested the new production line from Jun 2013 and this increases Shanghai Lijin’s advantage in the carbon

fiber tube industry. There are just a few real filament wound carbon fiber tube manufacturers in domestic

China and we are one of them.
 

Since the rapid growth of UAV in the international market, instead of the standard plane like Phantom from DJI, RC fans are getting more interested in the customized multicopters. As carbon fiber is the most preferred

material for UAV, Carbon Fiber CNC parts demand is increasing. Shanghai Lijin sticks to offering OEM service for the international market, fine quality and prompt delivery.To ensure the thickness tolerance +/-0.10mm and minimum warp of the Carbon Fiber plates that are used for the cutting, Shanghai lijin execute high standard to

the plate production. For the normal thicknesses including 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm,
Shanghai Lijin keeps regular stock, to make sure the raw material will be available for cutting immediately when order is firmed.Experienced engineers are in Shanghai Lijin’s office ready to deal with different types of

drawings from customers. No matter the drawing formats are .DWG, .DXF that can be edited by AutoCAD

and used directly for production, 3D drawings like .IGS, or even draft drawings, our staff can do adjustment and change to customer’s idea. Our engineers are also good at English communication, Email and IM is easy

for them. Editing drawings for customers is FREE* of charge. Shanghai Lijin is having several professional CNC machines for carbon fiber cutting and drilling, with the capacity of cutting 20-50pcs standard full sized plate per day. The carbon fiber chassis general cutting tolerance Shanghai Lijin offer is +/-0.02mm. The

special designed cutting solution ensures the smoothness of the cutting edge.

‘Customers’ Persuit for Change, Lijin’s Motivation for Growth’, Shanghai Lijin takes customers’ demand for center, enhances the
customer satisfaction, and grows with customer.