FRP Square Tube

High Quality Pultruded FRP Square Tubes


Fiber Reinforced Polymer (FRP) Square Tube is a widely used structural material in various applications due to its high strength, lightweight, and corrosion-resistant properties. FRP Square Tube is composed of a resin matrix and reinforcing fibers, such as glass, carbon, or aramid fibers. In this post, we will focus on the FRP Square Tube that is designed to withstand tensile and compressive forces, making it ideal for use in structural applications.

FRP Square Tube
Fiberglass rectangular tube

Properties Of FRP Square Tubes

The FRP Square Tube has several unique properties that make it an ideal choice for structural applications. The high strength-to-weight ratio of the FRP Square Tube means that it can withstand high loads while remaining lightweight. The tube is also highly corrosion-resistant, making it ideal for use in harsh environments. Additionally, the FRP Square Tube has a high stiffness, allowing it to maintain its shape even under significant loads.

Performance ParameterValue
Density1.5 – 2.0 g/cm³
Tensile Strength300 – 900 MPa
Flexural Strength300 – 700 MPa
Compressive Strength200 – 400 MPa
Shear Strength40 – 80 MPa
Modulus of Elasticity20 – 30 GPa
Coefficient of Thermal Expansion1.2 – 2.5 x 10⁶ /K
Heat Distortion Temperature60 – 120°C
Flame RetardancySelf-extinguishing
Corrosion ResistanceExcellent
UV ResistanceExcellent
Electrical ConductivityInsulating

Note that the values listed above are general ranges and can vary based on the specific composition and manufacturing process of the FRP square tube.

Applications Of FRP Square Tubes

The FRP Square Tube has a wide range of applications in various industries, including construction, transportation, and marine. In the construction industry, the FRP Square Tube is used for structural support, such as beams and columns, due to its high strength and durability. The lightweight nature of the tube also makes it easy to transport and install on construction sites.

In the transportation industry, FRP Square Tubes are used for the construction of lightweight vehicles, such as bicycles and motorcycles. The lightweight nature of the tube helps to improve the fuel efficiency of these vehicles, making them more environmentally friendly.

In the marine industry, the FRP Square Tube is ideal for use in boat and shipbuilding due to its high corrosion resistance. The tube is also highly durable, making it an ideal choice for use in harsh marine environments.

Comparison with Other Materials

Steel Square Tubes

Steel square tubes are a common material used in construction due to their high strength and stiffness. However, steel tubes are prone to corrosion, especially in humid environments, and require anti-corrosion treatment. Additionally, steel tubes are heavy, which makes them difficult to transport and install.

Aluminum Alloy Square Tubes

Aluminum alloy square tubes are lightweight and have good corrosion resistance and strength, making them suitable for use in construction, aviation, and automotive industries. However, the strength and stiffness of aluminum alloy tubes are not as good as those of steel tubes, and they are more expensive than FRP square tubes.

PVC Square Tubes

PVC square tubes are a widely used plastic material in the construction and electrical industries due to their anti-corrosion and insulating properties. However, PVC tubes have low strength and stiffness, making them unsuitable for structures that require high load-bearing capacity.

Advantages of FRP Square Tubes

High Strength and Stiffness

FRP square tubes have high strength and stiffness, which are comparable to steel tubes. This makes them suitable for structures that require high load-bearing capacity.


FRP square tubes are lightweight, weighing over 70% less than steel tubes of the same strength. This makes them easier to transport and install, reducing labor costs.

Corrosion Resistance

FRP square tubes have excellent corrosion resistance, which eliminates the need for anti-corrosion treatment. They are not affected by moisture, chemicals, or UV radiation, which makes them ideal for use in harsh environments.

Long Life Span

FRP square tubes have a long life span and do not degrade over time. They are resistant to aging, fatigue, and environmental factors, which makes them a cost-effective alternative to other materials.

Easy to Install

FRP square tubes are easy to install and require no special equipment or skills. They can be cut, drilled, and installed using standard tools, reducing installation time and costs.


The design of the FRP Square Tube is critical to its performance in structural applications. The design must take into account the load-bearing requirements of the application, as well as the environmental factors, such as temperature and humidity. The design must also consider the manufacturing process, including the choice of resin and reinforcing fibers, as well as the method of manufacturing.

FRP square tubes are usually used with smc molded square tube connectors. If you need smc molded square tube connectors, please click here!


The manufacturing process of the FRP Square Tube involves several steps, including the selection of the resin and reinforcing fibers, the formation of the tube shape, and the curing of the resin. The manufacturing process must be carefully controlled to ensure that the resulting tube meets the required specifications.


In summary, the FRP Square Tube is a versatile and reliable material that can be used in a wide range of structural applications. Its high strength-to-weight ratio, corrosion resistance, and durability make it an ideal choice for use in harsh environments, such as construction sites, marine environments, and transportation. The design and manufacturing of the tube must be carefully controlled to ensure that it meets the required specifications.

Other Shapes Of FRP profiles

Contact us

Our factory provides OEM /ODM service and support and other services. We can also assist you with various designs for new product development and product material switching. If you are interested in learning more about FRP Square Tubes, please visit our website or contact us for more information.


Test Equipment

Testing Equipment

Our company is equipped with various testing equipment to perform strength and performance tests on fiberglass and carbon fiber products of various sizes. This ensures consistent product quality and enhances overall reliability.

tstar test report CFRP
tstar test report FRP


  1. Are you a retail seller? No, we are a factory and only accept bulk orders. Our minimum order quantity (MOQ) is 1000 pieces.

  2. What payment methods do you accept? We accept payment via T/T (Telegraphic Transfer) and LC (Letter of Credit).

  3. Can all products be customized? Yes, we offer customization options for all our products. You can specify your requirements, such as dimensions, colors, and other specifications, and we will tailor the products accordingly.

  4. Can I get samples before placing a bulk order? Certainly! We provide samples, and you can request up to 10 pieces for evaluation purposes. Please note that samples may incur a nominal fee.

  5. What are the available shipping methods? We offer various shipping options to accommodate your needs. You can choose between sea freight, express delivery, rail transportation, or air freight.

  6. What is your monthly production capacity? Our average monthly production capacity is 1 million meters. However, this may vary depending on the specific product and customization requirements.

  7. Do I need to pay a deposit before production starts? Yes, a deposit is required before we commence production. Once we receive the deposit, we will initiate the manufacturing process.

Please feel free to reach out to our sales team for any further inquiries or specific requirements. We are here to assist you and provide the best solutions for your bulk order needs.


we provide the following services:

  • OEM /ODM service and support
  • Free promotion material if needed
  • Clients service one-to-one
  • Effective communication within 24 hours
  • New design and style collection updating for customer

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