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What Is a Fiberglass Square Tube?

    A fiberglass square tube is an engineered composite material made from glass fiber reinforcements embedded in a resin matrix, combining the high tensile strength of glass fibers with the corrosion and chemical resistance of the resin. This hybrid offers exceptional performance across many industries. Commonly produced as a structural profile, the fiberglass square tube retains all the benefits of fiberglass materials. Its inner and outer surfaces undergo special finishing: the interior is kept smooth to reduce fluid friction, while the exterior treatment enhances appearance and weather resistance. Some versions also include UV inhibitors in the resin to improve outdoor durability.

HowIs a Fiberglass Square Tube Made?

Most fiberglass square tubes are manufactured via the pultrusion process—a continuous production method:

1.Glass fiber rovings are pulled through a resin bath to ensure full impregnation.

2.The saturated fibers enter a pre-forming die to shape the cross-section.

3.The material then moves into a heated forming die for resin curing.

4.The cured profile is pulled out continuously and cut to the desired length.

Key production parameters include resin formulation, fiber content (typically 30–70%), curing temperature, and pull speed. Resins usually used are unsaturated polyester or epoxy, combined with curing agents and promoters. Controlling these variables is vital as they directly impact mechanical strength and longevity.

Advantages of Fiberglass Square Tube

1.Lightweight yet strong: Pultruded fiberglass can be up to 75% lighter than steel while offering comparable strength.

2.Exceptional corrosion resistance: It withstands harsh chemical environments and resists rust, rot, and insect damage.

3.Electrically non-conductive: Safe for electrical applications; it’s also non-magnetic and transparent to electromagnetic frequencies.

4.Dimensional stability and durability: It maintains its form over time with minimal maintenance.

5.Cost-effective over lifecycle: Long-lasting with low upkeep needs, leading to reduced life-cycle costs.

Typical Applications of Fiberglass Square Tube

1.Construction & Architecture: Used for handrails, support frames, trusses, and guardrails—combining load-bearing capability, corrosion resistance, and aesthetics.

2.Chemical & Industrial Sectors: Ideal for harsh environments; used in tanks, ductwork, and structural components where corrosive media are present.

3.Electrical and Utility Infrastructure: Perfect for cable trays, insulators, and protective structural profiles, thanks to non-conductivity and electromagnetic transparency.

4.Municipal & Outdoor Projects: Suited for drainage systems, light-poles, signage, and public infrastructure—offering speed, lightness, and impact resistance.

Standard Dimensions (Examples)

Common sizes of fiberglass square tube include:

16 × 16 mm

19 × 19 mm

22 × 22 mm

25 × 25 mm

30 × 30 mm

32 × 32 mm

40 × 40 mm

42 × 42 mm

50 × 50 mm

58 × 58 mm

63 × 63 mm

80 × 80 mm

100 × 100 mm

150 × 150 mm

200 × 200 mm

Available Colors

Standard options include yellow, white, and red—custom colors are available upon request.

In addition, Henry also provides various specifications of building materials such as fiberglass round pipes, fiberglass pipes, fiberglass grating, fiberglass roof panels, etc.