Name: High Strength FRP Pultruded Square Tube Manufacturer
Brand: Tolike
SKU: FRP Square Tube
Price: 300 USD
Availability: InStock

High Strength FRP Pultruded Square Tube Manufacturer

FRP Square Tube – a lightweight, corrosion‑resistant fiberglass‑reinforced polymer tube designed for structural framing, support beams, and insulation applications where strength, durability, and low maintenance are essential.

Specification	Unit	Value
Cross-section Side Length	mm	20-200mm (customizable)
Thickness	mm	2-10mm (customizable)
Surface	–	Smooth or textured
Color	g/cm3	Customized
Tensile strength	MPa	300-500
Compressive strength	MPa	200-400
Flexural strength	MPa	300-500

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Detailed Introduction to FRP Pultruded Square Tubes

TOLIKE High Strength FRP Pultruded Square Tube is a premium structural profile made from continuous glass fiber and high-grade resin. Manufactured by TOLIKE, a professional GFRP pultruded profile manufacturer and supplier, it combines outstanding load-bearing strength with very low weight.

Unlike steel or wood, these pultruded square tubes never rust, resist acids, moisture and UV rays, and need almost no maintenance. They suit handrails, cable tray supports, platforms and marine structures, cutting long-term replacement cost for buyers.

TOLIKE also welcomes wholesale and bulk orders with custom sizes, thickness and colors. As an experienced FRP square tube exporter and factory, we supply free samples and fast quotes—reliable high strength FRP pultruded square tubes for sale worldwide.

Production process of yellow GFRP pultruded rectangular tubes

Features of FRP Pultruded Square Tubes

Material & Construction‌

Made from continuous glass fibre roving and thermoset resin, pultruded into a solid square profile.
Glass content up to 70%, giving a strength-to-weight ratio higher than steel.
Dense, void-free surface with a smooth finish and optional polyester surfacing veil.

‌Mechanical Performance

High tensile, flexural and compressive strength along the pultrusion axis.
Excellent impact and fatigue resistance for long-term cyclic loading.
Lightweight — roughly one quarter the density of steel for the same section.
Rigid, dimensionally stable and resistant to warping or sagging.

Corrosion & Environmental Resistance‌

Immune to rust, rot, and galvanic corrosion, unlike steel or aluminium.
Resists acids, alkalis, salts, chlorine and most industrial chemicals.
UV-stabilised for outdoor exposure; no repainting or galvanising required.
Withstands salt water, humidity and freeze-thaw cycles without degradation.
Low thermal conductivity reduces condensation and heat transfer.

Production process of large grey FRP pultruded square tubes

‌Electrical & Thermal Properties‌

Non-conductive, with excellent dielectric strength and no sparking risk.
Non-magnetic and radio-transparent — suitable for imaging and telecom sites.
Electrically insulating, eliminating the need for separate grounding.

‌Workability & Machining‌

Easily cut, drilled, tapped and machined with standard tooling.
Can be bonded, bolted or riveted into finished structures on site.
Low moisture absorption keeps dimensions and properties stable.

‌Supply & Customisation‌

Available in round, square, rectangular and custom hollow sections.
Custom sizes, wall thicknesses, lengths and colours on request.
Fire-retardant, anti-static and high-temperature grades available.
Bulk and wholesale supply with competitive factory pricing and fast lead times.

Technical Parameters of Fiberglass Pultruded Square Tubes

Type	Unit	Value
Length	mm	1000~6000
Width	mm	20~200
Thickness	mm	2~10
Color	–	Customized
Surface	–	Smooth or textured
Parameter	Unit	Value
Density	g/cm3	1.8-2.0
Tensile strength	MPa	300-500
Compressive strength	MPa	200-400
Flexural strength	MPa	300-500
Modulus of elasticity	GPa	20-40
Thermal conductivity	W/mK	0.25-0.35
Coefficient of thermal expansion	1/K	8-12 x 10^-6

Cross sectional cut of a blue pultruded Fiberglass square tube

GFRP Pultruded Square Tube Applications

GFRP pultruded square tubes — also supplied as ‌glass fibre reinforced polymer box sections‌, ‌pultruded FRP square tubing‌, ‌GRP square hollow profiles‌ and ‌composite structural square tubes‌ — are load-bearing members pultruded from continuous glass fibre and thermoset resin. They combine high axial strength with permanent resistance to corrosion, rot and UV exposure, plus full electrical insulation and zero magnetic interference, which is what separates them from steel, aluminium and timber tubing.

That combination places these profiles in applications where metals fail fast. Electroplating and electrolytic cells rely on them for insulating busbar supports and anode frames; chemical, fertiliser and pharmaceutical plants use them for acid-proof walkway frames, cable tray supports and scrubber internals; aquaculture and coastal projects build fish-cage frames, floating gangways and dock handrails that stay rust-free in salt water; solar PV and EV charging canopies adopt non-conductive framing to eliminate grounding risk; and wastewater plants and rail platforms specify them for fencing, signage supports and grating beams.

Beyond those mainstream niches, GFRP square tubes reach uses that few metal sections can serve at all: MRI and imaging rooms, where a non-magnetic frame keeps equipment readings clean; radar, antenna and telecom masts, where the material is transparent to radio signals; cold storage and freezer rooms, where it acts as a thermal break and stops condensation dripping onto stored goods; food and beverage washdown lines, where it tolerates daily chemical cleaning; and explosion-proof or high-voltage zones, where its insulating behaviour removes spark and earthing hazards.

In service, that translates into lifecycle savings rather than just a material swap. GFRP square tubes typically outlast painted steel several times over, need no galvanising, repainting or cathodic protection, and install at roughly one quarter of the weight — cutting crane time, freight cost and on-site labour. They can also be supplied in custom sizes, wall thicknesses and colours so each of these applications is built to its own specification rather than forced into a standard metal size.

Applications of Pultruded FRP Square Tube Profiles

FAQ — FRP Pultruded Square Tube

Weight for weight, pultruded GFRP square tubing outperforms mild steel, with tensile strength typically between 300 and 450 MPa at roughly one quarter of steel’s density. A 50×50×5 mm FRP square tube commonly replaces a similar steel section in handrails, walkways and cable tray supports, and since there is no corrosion allowance being eaten away, its working load stays constant for decades rather than degrading year by year.

Span depends on section size, wall thickness, applied load and acceptable deflection. As a planning guide, a 50×50×5 mm FRP square tube suits light-load spans of about 2.0–2.5 m, while 100×100×8 mm reaches 4–5 m for platform beams and walkway framing. TOLIKE supplies section properties and deflection figures so each project can be verified before ordering.

Yes, provided the correct resin and surface veil are specified. Isophthalic polyester covers general outdoor exposure, while vinyl ester resin or a UV-stabilised gelcoat delivers the best results under intense sunlight, salt spray and industrial atmospheres. Typical outdoor service life for a quality pultruded FRP square tube exceeds 20 years with no repainting or galvanising.

General-purpose FRP square tubing carries no fire rating, but fire-retardant grades meeting ASTM E84 Class A and UL94 requirements are available, along with phenolic resin versions for low-smoke, low-flame-spread areas such as tunnels, rail platforms and public buildings.

Yes. These composite profiles machine much like hardwood: carbide or diamond tooling cuts them cleanly, and they accept drilling, tapping, bolting and adhesive bonding with ordinary workshop equipment. Use 316 stainless steel fasteners and pre-drill holes about 1 mm oversize to allow for thermal movement.

Isophthalic polyester is the economical option for general structural and mildly chemical duty; vinyl ester is the benchmark for strong acids, solvents and long-life marine or chemical plant work; phenolic resin is specified where fire performance and low smoke emission matter most. Correct resin selection is the single biggest factor in FRP square tube lifespan.