FRP purlins

FRP purlins are a type of building structural material made of glass fiber reinforced plastic (FRP), often used in the support systems of roofs and walls.

Performance characteristics

Excellent corrosion resistance: Made of high-strength glass fiber and corrosion-resistant resin, it can resist the erosion of harmful substances in acid rain, seawater, industrial waste gas, etc., without the need for additional anti-corrosion treatment. It is suitable for corrosive environments such as chemical plants and coastal areas.

Strong anti-aging ability: By adding ultraviolet absorbers or stabilizers, it can effectively resist ultraviolet radiation, and has a low coefficient of thermal expansion. It can maintain its shape unchanged even under large temperature differences, has excellent weather resistance, is not easily affected by moisture, mold, etc., and has long-lasting mechanical properties.

Lightweight and high strength: Its weight is only about 1/4 of that of steel purlins, but its tensile strength is ≥300MPa. It is easy to install, can reduce structural load, and is also convenient for transportation.

Good insulation performance: Volume resistivity ≥10¹²Ω · cm, with excellent insulation properties, suitable for use in substations, electronic factories and other places with anti-static requirements.

Excellent seismic performance: FRP materials have a certain degree of flexibility and elastic modulus, which can absorb a certain degree of vibration energy and reduce the damage caused by natural disasters such as earthquakes to buildings.

Production process

The pultrusion molding process is usually adopted. Glass fiber and resin are scientifically proportioning and go through processes such as impregnation, pultrusion, high-temperature curing, and cutting to form purlins with specific shapes and sizes. The product surface is smooth and flat, free of cracks and bubbles, and can ensure dimensional stability and mechanical properties meeting standards.

Application field

It is widely applied in industrial buildings, such as factory workshops, warehouses, etc. Marine engineering, such as offshore platforms, port terminals, etc. Chemical industry; Agricultural facilities, such as greenhouses and breeding sheds, etc. And the roof and wall support structures of transportation infrastructure, such as Bridges, stations and other public buildings.

Core Strengths 

High-strength anti-bending property, suitable for large-span load-bearing of the roof. It will not sag or deform even after long-term use.  
2. Resistant to corrosion and rust-free, it perfectly suits environments with strong corrosive roofing conditions such as chemical plants and acid washing workshops. With maintenance-free capability, its lifespan can exceed 20 years.  
3. Lightweight and highly strong, its weight is only 1/4 of that of steel trusses, significantly reducing the roof load and construction costs.  
4. Insulation and heat insulation properties. The thermal conductivity is much lower than that of metal beams, which can enhance the building's insulation and energy-saving performance.  
5. Installation is convenient. It can be directly combined with roofing materials such as color steel sheets and shading panels, significantly improving the construction efficiency. 

Structural Characteristics 

The continuous glass fibers are laid in a direction along the length, and the entire structure is formed through the pultrusion process and is once fully cured. It is completely dense and defect-free. It mostly adopts C-shaped or I-shaped high-section designs, with high moment of inertia of the cross-section, excellent bending resistance, uniform wall thickness that can be controlled, and can be customized with different heights and wall thickness specifications as needed. The length can be customized according to the roof span. The surface is smooth and can be directly installed. The overall structure has strong resistance to deformation and load, and is suitable for meeting the long-term load-bearing requirements of the roof.

Focusing on Performance 

It features high strength in bending resistance, corrosion resistance and weather resistance, light weight, heat insulation, and stable structure. 
It is suitable for applications such as highly corrosive roofs, large-span buildings, and long-term outdoor use. The mechanical performance retention rate is high within a wide temperature range, and it is resistant to creep, freeze-thaw, and aging, meeting the long-term stable load-bearing requirements for industrial building roofs.

Applicable Scenarios 

It is widely used in various industrial and civil building roof conditions that require anti-corrosion and load-bearing, such as the roofs of chemical workshop buildings, acid washing plants, sewage treatment plants, livestock farms, cold storage buildings, storage greenhouses, and coastal buildings.