FRP Pultruded Square Tube

Product Introduction

Pultruded profiles are made using the pultrusion process. Pultrusion is a continuous production method for glass fiber reinforced plastic profiles with uniform cross-sectional shapes and dimensions. The process involves: under the traction force produced by the forming equipment, adding materials (such as glass fiber roving, glass fiber mat, etc.) which are impregnated with matrix materials (such as unsaturated polyester resin, etc.) according to a specific configuration, then passing through a mold system where they continuously cure and form, resulting in a continuous output of smooth-surfaced, dimensionally stable, and extremely strong glass fiber reinforced plastic profiles. The main applications of pultruded profiles include: insulating support components, urban rail three-track protective covers and supports, antenna poles, high-voltage cable trays, high-voltage power operation rods, generator radiators, stairs and handrails, operating platforms, corridors, oil storage tanks, distribution boards and distribution rooms, drainage systems, berths and underwater identification markers, pressure rods in trains and cars, corner plates, highway guardrails, sound-absorbing panels, anti-glare panels, filler supports in towers, filter plate supports, frame materials for cold storage, etc.

Introduction to Pultruded profile production

The production is carried out through pultrusion, which is a continuous process method for manufacturing fiberglass reinforced plastic profiles with uniform cross-sectional shapes and dimensions. Under the traction force produced by the forming equipment, reinforcing materials (such as fiberglass reinforced plastic (FRP) untwisted roving, glass fiber continuous mat, etc.) are impregnated with matrix materials (such as unsaturated polymer resins) in a specific configuration form and then continuously cured and formed through the mold system, thereby obtaining FRP profiles with smooth surfaces, stable dimensions and extremely high strength.

Core Strengths 

Lightweight and high-strength, its specific strength exceeds that of carbon steel and aluminum alloys, significantly reducing transportation, lifting and construction costs. 
2. Resistant to corrosion and rust, suitable for harsh corrosive environments such as acids, alkalis, salt fog, and seawater, with no maintenance required throughout the entire lifecycle. 
3. Insulation is non-magnetic, with no eddy current losses and no risk of electrical sparks. The electrical safety performance is at its best. 
4. The dimensions are stable, with high section accuracy and small tolerances. It can be cut and joined on-site at will, resulting in an installation efficiency increase of over 50%. 
5. Weather-resistant and flame-retardant, with stable performance across a wide temperature range. It is resistant to ultraviolet rays and freeze-thaw cycles, and maintains its performance without degradation during long-term outdoor use. 

Structural Characteristics 

The continuous fiber integrated dense structure is adopted. The glass fibers are continuously laid in all directions along the axial direction, fully immersed in the resin system throughout the process. It is formed by one-time pull-extrusion curing in a high-temperature mold. There is no layering, no bubbles, and no splicing inside. The standard symmetrical square tube section has uniform wall thickness that can be controlled. Internal reinforcing ribs and embedded parts can be customized. The outer surface is smooth without burrs. The length can be freely customized. The moment of inertia of the cross-section is high, and the bending and torsion resistance performance is excellent. The overall structure does not deform under long-term load and has no stress concentration. 

Focusing on Performance 

It features lightweight, high strength, insulation resistance, corrosion resistance, stable size, and flame retardancy and weather resistance.
It is suitable for harsh working conditions such as high-voltage insulation, heavy-load bearing, strong corrosion, and outdoor exposure, and supports stable operation within a wide temperature range. It is resistant to creep, impact, and aging, and meets the requirements for long-term continuous stable use in industrial scenarios. 

Applicable Scenarios 

It is widely used in various industrial and municipal scenarios that require insulation, anti-corrosion, light weight, and high strength, such as power insulation supports, chemical anti-corrosion platforms and frames, rail transit protective components, municipal guardrails and towers, marine vessel structural components, cold storage insulation frames, and industrial equipment supports.