Diameter standards that slot into existing systems. Standard sizes commonly follow IPS (Iron Pipe Size) conventions, so FRP round tubes drop directly into support brackets, pipe clamps, and U‑bolt hangers designed for steel pipe. Standard diameters typically range from 25 mm to 300 mm. For a retrofit project—replacing corroded steel pipe supports in a water treatment plant, for instance—the FRP tube arrives with the same outside diameter as the steel it replaces. No bracket modifications, no spacer rings.
True torsional stiffness in all directions. A round cross‑section resists twisting loads equally from any angle. That matters for handrail posts that get grabbed, pulled, and leaned on from unpredictable directions, and for structural posts subject to wind loads that don't arrive neatly aligned with a square face.
Insulating sleeve applications without compromise. Because FRP is non‑conductive, round tubes commonly serve as insulating sleeves around busbars, through‑wall penetrations for electrical conduits, and isolation sleeves on cathodic protection systems. The consistent wall thickness helps ensure uniform dielectric performance along the entire length, with no thin spots to become a breakdown path.
Corrosion resistance that handles immersion and splash alike. In chemical dosing areas, wastewater channels, and coastal handrail systems, the tube sees moisture from all sides. Vinyl ester resin throughout the entire wall thickness means there is typically no coating to chip, no galvanising to wear thin, and no substrate to expose when the surface gets scratched during installation. Corrosion resistance is commonly verified under ASTM D543.
Typical applications replacing steel pipe and tubing include handrail and guardrail posts in corrosive environments, structural supports over chemical dosing tanks, electrical insulating sleeves and busbar covers, fluid‑handling area pipe supports and stanchions, and offshore and marine platform railings. Each application trades the corrosion clock of coated steel for a material that generally ignores the environment. For related handrail and access solutions, see FRP Access Systems and FRP Walkway Applications.
Standard wall thicknesses include 3 mm and 5 mm, with heavier options available on request, uniform throughout the entire cross‑section and length. Length is typically up to 6 m, with longer lengths and custom cut lengths available on request. Flexural modulus commonly ranges between 18–28 GPa, depending on fibre architecture and resin system. Resin options include isophthalic polyester as standard, with vinyl ester available for chemical immersion or aggressive marine environments. Maximum continuous service temperature is typically 80°C for polyester and 100°C for vinyl ester, with short‑term excursions acceptable. The profile is non‑conductive, suitable for insulating applications. Weight ranges from approximately 1–15 kg/m, depending on diameter—about one‑quarter of equivalent steel pipe. Surface finish is smooth as standard, with UV veil or custom colour options available on request. The consistent fibre architecture of pultruded FRP composites provides the uniform wall thickness and dimensional stability required for precision‑fit handrail and structural support applications.
Standard Dimensional Parameters
Commonly available outside diameters, wall thicknesses, and standard stock lengths for pultruded FRP round tubes are listed below for reference. Custom diameters, heavier wall sections, and project‑specific tolerances are available on request.
| Parameter | Commonly Available Specification |
|---|---|
| Tube — Small (OD × t) | 20×2 mm, 25×2 mm, 25×3 mm, 32×2 mm, 32×3 mm |
| Tube — Medium (OD × t) | 38×3 mm, 38×5 mm, 40×3 mm, 40×5 mm, 50×3 mm, 50×5 mm, 50×6 mm, 63×5 mm |
| Tube — Large (OD × t) | 75×5 mm, 75×8 mm, 80×5 mm, 100×5 mm, 100×8 mm, 100×10 mm, 150×8 mm, 150×10 mm, 200×10 mm |
| Standard Stock Length | 3 m, 6 m |
Additional outside diameters up to 300 mm and wall thicknesses up to 10 mm are available for custom orders. For section modulus data, load‑span tables, and structural design parameters, see the referenced flexural modulus and ASTM performance figures above.
Proven in Field
"The steel handrail posts around our chemical storage tanks needed repainting every two years, and the bases were still corroding through. We swapped them for FRP round tubes five years ago. The install used the same base flanges, and the posts haven't needed a single maintenance intervention since."
— Plant Engineer, Industrial Chemical Storage Facility
Request Round Tube Specifications & Section Properties
WayTong supplies pultruded FRP round tubes in standard IPS diameters from 25 mm to 300 mm with custom lengths, resin formulations, and surface finishes. Contact our technical desk for section modulus data, load tables, and project‑specific substitution support.
Request Product InformationFRP round tubes are part of the WayTong FRP Structural Profiles range, which also includes I‑beams, square tubes, angles, channels, solid rods, and flat bars. For complete mechanical and corrosion performance data, see the ASTM Standards Summary.