Product Description
Related solutions: Explore our pultruded FRP profiles, FRP rebar, pultrusion machines, pultrusion dies.
FRP Octagonal Tubes are eight-sided hollow profiles made from fiber-reinforced plastic. These strong, lightweight tubes are created through pultrusion – a manufacturing process where fibers are pulled through resin, shaped, and heat-cured to form a solid structure. The octagonal shape gives you flat surfaces for easy mounting and better torsional strength than round tubes. Our FRP tubes combine glass or carbon fibers with industrial-grade resins (polyester, vinyl ester, epoxy, phenolic, or polyurethane) to create structures that do not rust or corrode. We make these tubes with precise measurements – with straightness of 0.02mm and surface smoothness between Ra=0.025~0.012 – ensuring consistent quality in every batch. These tubes are suitable replacements for metal in harsh environments, offering a favorable strength-to-weight ratio. Whether you need poles for street lights, supports for chemical plants, or frameworks for vehicles, our FRP Octagonal Tubes provide reliable performance with lower maintenance needs than many traditional materials.
Technical Specifications
| Parameter | Standard Value | Available Options |
|---|---|---|
| Diameter (Across Flats) | 153mm | 8″ (203mm), 10″ (254mm) |
| Wall Thickness | 10mm | 0.25″ (6.4mm), 0.275″ (7.0mm) |
| Flexural Strength | 302-339 MPa | 3,000-5,000 MPa (carbon fiber) |
| Compression Strength | 302-339 MPa | Custom options available |
| Weight | 9 kg/m (6.33 lb/ft) | Varies by size |
| Moment of Inertia | 2,534-7,141 cm⁴ | Depends on dimensions |
| Section Modulus | 249-551 cm³ | Depends on dimensions |
| Straightness | 0.02mm | – |
| Surface Smoothness | Ra=0.025~0.012 | – |
| Boundary Tolerance | ±0.3mm | – |
| Pin Bearing Strength | 187-195 MPa | – |
| Washer Pull-Through | ~6,600 kg | – |
| Allowable Torque (Bolted) | 68 N·m | – |
Typical Applications
- Lighting poles: Direct embedment or flange-mounted street light poles
- Electrical conduit supports: Supporting cable trays and conduit runs in chemical plants
- Building structural components: Primary and secondary framing in corrosive environments
- Marine applications: Walkway supports, railings, and equipment mounts in saltwater environments
- Equipment mounting systems: Supporting processing equipment in food, chemical, and water treatment plants
Key Benefits
Performance Benefits
- Lightweight but Strong: approximately 75% lighter than steel of equal cross-section while maintaining needed strength
- No Rust or Corrosion: resists deterioration in salt water, chemicals, or moisture
- Electrically Non-Conductive: No grounding needed, safer around electricity
- Long-Lasting: long service life with low maintenance
- Dimensionally Stable: Minimal expansion/contraction with temperature changes
Practical Benefits
- Easier Installation: Light enough for manual handling without heavy equipment
- No Painting Needed: Color goes throughout the material
- Lower Lifetime Cost: Saves money on maintenance and replacement
- Simple Mounting: Flat surfaces make attachment straightforward
- Customizable: Available in different sizes and performance levels
Practical Value
FRP octagonal tubes can reduce corrosion-related maintenance and simplify installation in harsh environments compared with metal alternatives.
Frequently Asked Questions
How do you cut FRP Octagonal Tubes?
Use a diamond-coated blade or fine-tooth carbide saw. Cut slowly with light pressure and wear a dust mask. We can also pre-cut tubes to your exact specifications before shipping.
Can I drill holes in these tubes?
Yes, use a sharp carbide drill bit at medium speed. Support the tube near the hole location to prevent splintering. For best results, start with a pilot hole and gradually increase to your final size.
How do I connect tubes together or to other structures?
You can use bolted connections (with a maximum torque of 68 N·m), adhesive bonding with structural epoxy, or specialized FRP connection systems. The flat surfaces make mechanical fastening much easier than with round tubes.
What temperatures can these tubes handle?
Standard tubes work well from -30°C to +80°C. Special resin formulations are available for more extreme conditions. Unlike metal, these tubes won’t become brittle in cold or weaken in heat.
How much weight can an FRP Octagonal Tube support?
A typical φ153mm×10mm tube can support distributed loads up to 2,500kg in proper installations. The compression strength ranges from 302-339 MPa. We can provide specific load calculations for your application.
Do these tubes fade or degrade in sunlight?
All our tubes include UV inhibitors that prevent significant degradation. After 10 years of outdoor exposure, you might see slight color fading, but the structural properties remain unchanged.
Want specific advice for your project? Contact our engineering team with your requirements, and we’ll recommend the right FRP Octagonal Tube specification for your needs.
Request a quote: Need this product for your project? Contact us for a quote — our engineering team can help with specifications, custom sizes, and bulk orders.
