Fiberglass square and rectangular tubes (FRP)
Pultruded fiberglass square and rectangular tubing (SHS / RHS) from 25×25 mm to 240×240 mm for columns, posts and frames. Select H × B × wall thickness, then confirm the installed orientation, connection details and cut list.
- A
- 2,944 mm²
- Ix
- 418.4 cm⁴
- Mass
- 4.5 kg/m
Specify the tube and its supply scope
FRP square and rectangular tubes provide flat faces for posts, frames and equipment supports. State whether you need tube lengths or finished parts with cutting, holes and end treatment. Square hollow sections (SHS) have equal outside height and width; rectangular hollow sections (RHS) have unequal sides. Both use the same catalog below, with H, B and wall thickness identified separately. Specify the laminate and complete connection for the service conditions; a hollow structural profile does not establish an electrical conduit rating.
Comparing materials for a lightweight member? Compare carbon fiber and fiberglass tubes. Carbon may suit high axial stiffness and low moving mass; fiberglass may suit cost-sensitive designs and electrical insulation needs. Compare the actual laminate, loads and connections, and qualify any electrical duty for the finished assembly.
- E23 material reference
- Square and rectangular
- Smooth bore
- 6 m lengths or cut to size
Select nominal dimensions and units 20 catalog sizes
Square tubing: H = B
Use equal outside dimensions for a square post or frame member. Check wall thickness and the internal space needed for sleeves or inserts; outside dimensions alone do not define the connection fit.
Rectangular tubing: H ≠ B
Mark which side is vertical in the installed member. Rotating an RHS changes its bending properties relative to the load; use the section properties for that orientation when comparing spans and deflection.
| Model | Drawing and quote | ||||||
|---|---|---|---|---|---|---|---|
| SHS 25×25×3.2 | 25≈ 0.984 in | 25≈ 0.984 in | 3.2≈ 0.126 in | 0.4 | 2.258 | 1.806 | DocumentsDXFQuote |
| SHS 38×38×4.8 | 38≈ 1.496 in | 38≈ 1.496 in | 4.8≈ 0.189 in | 0.9 | 11.95 | 6.292 | DocumentsDXFQuote |
| RHS 40×20×7 | 40≈ 1.575 in | 20≈ 0.787 in | 7≈ 0.276 in | 1.0 | 9.788 | 4.894 | DocumentsDXFQuote |
| RHS 40×25×8 | 40≈ 1.575 in | 25≈ 0.984 in | 8≈ 0.315 in | 1.2 | 12.3 | 6.148 | DocumentsDXFQuote |
| SHS 50×50×5 | 50≈ 1.969 in | 50≈ 1.969 in | 5≈ 0.197 in | 1.4 | 30.75 | 12.3 | DocumentsDXFQuote |
| SHS 60×60×5 | 60≈ 2.362 in | 60≈ 2.362 in | 5≈ 0.197 in | 1.7 | 55.92 | 18.64 | DocumentsDXFQuote |
| SHS 75×75×6 | 75≈ 2.953 in | 75≈ 2.953 in | 6≈ 0.236 in | 2.5 | 132.4 | 35.31 | DocumentsDXFQuote |
| RHS 80×60×5 | 80≈ 3.150 in | 60≈ 2.362 in | 5≈ 0.197 in | 2.0 | 113.1 | 28.27 | DocumentsDXFQuote |
| RHS 100×60×8 | 100≈ 3.937 in | 60≈ 2.362 in | 8≈ 0.315 in | 3.6 | 282.7 | 56.54 | DocumentsDXFQuote |
| SHS 100×100×6 | 100≈ 3.937 in | 100≈ 3.937 in | 6≈ 0.236 in | 3.5 | 333.6 | 66.72 | DocumentsDXFQuote |
| SHS 100×100×8 | 100≈ 3.937 in | 100≈ 3.937 in | 8≈ 0.315 in | 4.5 | 418.4 | 83.69 | DocumentsDXFQuote |
| SHS 114×114×6 | 114≈ 4.488 in | 114≈ 4.488 in | 6≈ 0.236 in | 4.0 | 505.4 | 88.67 | DocumentsDXFQuote |
| SHS 114×114×8 | 114≈ 4.488 in | 114≈ 4.488 in | 8≈ 0.315 in | 5.2 | 638.8 | 112.1 | DocumentsDXFQuote |
| RHS 120×60×5 | 120≈ 4.724 in | 60≈ 2.362 in | 5≈ 0.197 in | 2.6 | 309.4 | 51.57 | DocumentsDXFQuote |
| SHS 120×120×8 | 120≈ 4.724 in | 120≈ 4.724 in | 8≈ 0.315 in | 5.6 | 753.1 | 125.5 | DocumentsDXFQuote |
| SHS 132×132×9.5 | 132≈ 5.197 in | 132≈ 5.197 in | 9.5≈ 0.374 in | 7.0 | 1,171 | 177.5 | DocumentsDXFQuote |
| SHS 152×152×9.5 | 152≈ 5.984 in | 152≈ 5.984 in | 9.5≈ 0.374 in | 8.2 | 1,841 | 242.2 | DocumentsDXFQuote |
| SHS 160×160×8 | 160≈ 6.299 in | 160≈ 6.299 in | 8≈ 0.315 in | 7.4 | 1,878 | 234.8 | DocumentsDXFQuote |
| SHS 200×200×10 | 200≈ 7.874 in | 200≈ 7.874 in | 10≈ 0.394 in | 11.6 | 4,585 | 458.5 | DocumentsDXFQuote |
| SHS 240×240×12 | 240≈ 9.449 in | 240≈ 9.449 in | 12≈ 0.472 in | 16.8 | 9,508 | 792.3 | DocumentsDXFQuote |
Catalog dimensions identify standard section options, not live inventory. Confirm tooling, material, quantity and production timing in the quotation.
Allowable loads by spanA different size or an exact inch dimension: send a drawing
Match the drawing and reports to the selected tube
Open the square and rectangular tube evidence packageto review available references and items still to confirm. Identify the section and formulation where known; a report for another laminate or assembly is not an approval of this tube. Use the size row's Quote link to carry its catalog configuration into the inquiry.
- Data sheet20 sizes · web page
Square and rectangular tube datasheets
- Issued by
- F1 Composite
One page per size: dimensions, calculated section properties, E23 laminate data and, where published, allowable load by span.
- CADDXF · 20 sizes
Square and rectangular tube section drawings
- Issued by
- F1 Composite
Dimensioned cross-sections that open in AutoCAD, DraftSight or LibreCAD. Download one from its row in the size table; no login or email.
- Test reportPDF · 896 KB
E40 evidence — SGS full-section test, 40.8 GPa
- Issued by
- SGS
- Issued
- For
- Square and rectangular tubes
SGS SHIN2608002943CM01_EN, issued 2026-09-07: full-section test to EN 13706-2 Annex D, 40.8 GPa average from three specimens. Page 1 specification 60605; page 3 specimen 2160 × 90 × 90 mm. These size identifiers need clarification before size-specific qualification. Results apply only to the tested samples; conclusion N/A, with an internal-reference use note. Supports the reported 40 GPa-class result, not EN 13706 E40 certification or a design allowable.
- Test reportPDF · 888 KB
E40 evidence — SGS full-section test, 41.5 GPa
- Issued by
- SGS
- Issued
- For
- Square and rectangular tubes
SGS SHIN2608002943CM02_EN, issued 2026-09-07: full-section test to EN 13706-2 Annex D, 41.5 GPa average from three specimens. Page 1 specification 90905; page 3 specimen 1440 × 60 × 60 mm. These size identifiers need clarification before size-specific qualification. Results apply only to the tested samples; conclusion N/A, with an internal-reference use note. Supports the reported 40 GPa-class result, not EN 13706 E40 certification or a design allowable.
- Data sheetPDF · 3 MB
FRP Profile Design Manual — DOC-PF-2026-EN Rev. B
- Issued by
- F1 Composite
- For
- Structural shapes
Revision B (October 2026), generated from the website's catalog, laminate and design-basis data: EN 13706 E23 laminate values beside the grade minimums, section properties of all 114 catalog sizes, allowable uniform loads to the published LRFD screening basis, application guides, durability stated by resin formulation, fabrication and inspection. A preliminary-sizing reference, not a project approval or batch certificate; it supersedes the withdrawn Rev. A.
- CertificatePDF · 142 KB
EPD & Carbon Footprint — Pultruded GFRP Composite Profiles
- Issued by
- CABR
- For
- Standard profiles
Unofficial English summary of the environmental product declaration and carbon footprint analysis for pultruded GFRP composite profile products, with 1 m² functional unit. Calculation reference CABR-CFC-01(02)-2025(20030)1, cradle-to-gate 33,934.34 g CO₂e/m², distribution 254.59 g, cradle-to-grave 36,099.32 g. Standards: GB/T 24025-2009 (ISO 14025-aligned Type III EPD), GB/T 32161-2015, ISO 14067, PAS 2050. Issued by China Academy of Building Research Co., Ltd. (CABR) Certification Center on April 30, 2025. The original Chinese documents, with the holder and scope, are provided on request.
- CatalogOn request
Product Catalog 2024
- Issued by
- F1 Composite
- For
- All products
Complete catalog of standard pultruded FRP profiles with dimensions, properties, and ordering information.
- CertificateOn request
ISO 9001 Certificate
- For
- All products
Request the current quality-management certificate with its edition (ISO 9001:2015, or ISO 9001:2026 after transition), holder, validity and scope for your proposed supply.
- CertificateOn request
CE Declaration of Performance
- For
- All products
Request product-specific performance and applicable conformity documentation; confirm the intended use and assessment route.
Review the material basis and load case
Material reference · E23-ISO
Published reference values for the general-purpose isophthalic polyester laminate. Match the section, formulation and supporting documents before selecting design values for an order.
| Property | Reference value | Method reference |
|---|---|---|
| Tensile modulus (longitudinal)EN ISO 527-4 | 23 GPa | EN ISO 527-4 |
| Tensile modulus (transverse)EN ISO 527-4 | 7 GPa | EN ISO 527-4 |
| Tensile strength (longitudinal)EN ISO 527-4 | 240 MPa | EN ISO 527-4 |
| Flexural strength (longitudinal)EN ISO 14125 | 240 MPa | EN ISO 14125 |
| Interlaminar shear strength (ILSS)EN ISO 14130 | 30 MPa | EN ISO 14130 |
| Pin-bearing strength (longitudinal)EN 13706-2 Annex E | 150 MPa | EN 13706-2 Annex E |
| DensityEN ISO 1183 | 1.9 g/cm³ | EN ISO 1183 |
| Glass contentEN ISO 1172 | 65–70% by weight | EN ISO 1172 |
The listed moduli, tensile and flexural strengths, and pin-bearing strength use EN 13706-3 E23 minimums. ILSS, density and glass content are the published E23-ISO material references. These values and method names do not constitute a test report for the selected profile. Full property table and test methods
Resin routes to review
- Isophthalic polyesterThe E23-ISO reference uses this resin family. Confirm its suitability for the profile and service conditions.
- Fire-retardant polyesterState the required fire test and classification, then confirm evidence for the offered formulation and specimen scope.
- Vinyl esterA candidate for chemical exposure. Provide the chemicals, concentrations, temperatures and exposure duration; specify fire requirements separately.
- PolyurethaneReview the proposed profile, processing route and mechanical requirements with the supplier.
- PhenolicA route to evaluate where fire, smoke or toxicity criteria apply. Confirm manufacturability and the relevant test evidence.
A change of resin, reinforcement, pigment or surface finish can change the applicable properties and evidence. Confirm the grade and reports for the offered configuration. Compare resin systems
Agree machining, connections and inspection
Holes and fastener access
Send hole positions, diameters and edge distances on a controlled drawing. Show whether the installer can reach both sides of the connection, and whether the joint includes an insert, sleeve or bracket.
Bearing and clamping
Identify local loads at bolts, bases and clamps. The connection design must check wall bearing and crushing; agree the reinforcement detail and tightening procedure instead of transferring a steel-tube detail unchanged.
Site work and environment
Separate factory cutting and drilling from work left to the installer. Specify cut-edge treatment, drainage where relevant, hardware compatibility and inspection. For cooling towers, include water chemistry and service temperature.
Identify the drawing revision, datum faces and installed orientation for each part. Agree how critical hole positions, cut lengths and fit will be measured, including any first article; a nominal catalog size does not establish finished-part acceptance.
Specify cutting, drilled holes and machining tolerancesPlan the inspection recordReview fabrication and connection guidanceCooling tower specification inputs
Applications
Case study · Project photoFactory access staircaseA bolted FRP stair in our Chongqing plant, assembled by four people with hand tools: no welding, hot work or crane.Profiles used Square tubes with the I-beam stringers and landing beams, in vinyl ester
ApplicationFRP cooling tower profilesSquare tubes for frames, posts, and bracing.
ApplicationFRP chemical plant platformsFRP round tubes and square tubes for handrails and guardrails.
Questions buyers ask
Can I order fiberglass tubing cut to length?
Include finished length per piece, piece count, end cuts or holes, and tolerances with your selected section. We review the cutting and machining scope, material and packing before confirming the quotation. Catalog dimensions are section options, not a live stock list.
What is the minimum order quantity and lead time?
Minimum quantity and timing are confirmed for the section, resin, tooling and processing required. Send your trial quantity, expected repeat demand, destination and target date. Ask for sample arrangements and production and shipping timing to be listed separately in the quotation.
What is the advantage of FRP square tubes over open profiles?
A closed section provides flat mounting faces and can be useful where a frame member carries bending and torsion. Compare the actual geometry, laminate and load case with an I-beam or channel; the shape name alone does not establish capacity. Check local bearing and access to the inside face before choosing a bolted connection.
Are rectangular hollow sections (RHS) available?
Yes. The catalog includes rectangular hollow sections such as 80×60, 100×60 and 120×60 mm alongside square sections. Confirm tooling, material, production quantity and timing in your quotation. Send a drawing for a custom rectangular size.
Can I use these tubes in a cooling tower frame?
Square and rectangular tubes can be considered as frame members when the section, laminate and connections meet the project requirements. Send water chemistry, maximum service temperature, member loads, bracing and connection drawings. The cooling tower application guide covers the specification inputs; a catalog section is not an approved tower structure.
Quote FRP square and rectangular tubes
Send H × B × wall thickness, the installed orientation and a cut list, with the connection drawing where available. We reply within one business day; a formal quotation follows once the specification and delivery are reviewed.
- Section and fit
- Identify the catalog row or required H × B × wall, units and tolerances. Include the clearance needed for any mating insert or sleeve.
- Cut list and connections
- List finished lengths and piece counts, holes, brackets, inserts and end treatment. Identify factory processing and work to be completed on site.
- Loads and service
- Give span, support and bracing details, installed orientation, loads and allowable deflection. Include chemical, temperature, outdoor and fire requirements.
- Order and evidence
- State trial and repeat quantities, destination and target date. Confirm tooling, material, samples, applicable reports, inspection documents and production timing in the quotation.