Product Description
Related solutions: Explore our pultruded FRP profiles, FRP rebar, pultrusion machines, pultrusion dies.
FRP Square Tubes are hollow profiles made from glass fiber and polyester resin. These tubes are created through a process called pultrusion, which gives them good strength while keeping them much lighter than metal alternatives. Our FRP tubes resist corrosion from chemicals, salt water, and harsh weather, offering long service life in challenging environments. They don’t conduct electricity, which makes them safer for electrical applications. These tubes come in many sizes from small 25×25mm up to large 200×200mm profiles, with different wall thicknesses to match your project needs. FRP tubes are easy to work with using regular tools, and they require little maintenance once installed.
Technical Specifications
| Model | Size (mm) | Wall Thickness (mm) | Length (m) | Weight (kg/m) |
|---|---|---|---|---|
| FRP-ST-25×25 | 25 x 25 | 3 | 3-12 | 0.54 |
| FRP-ST-30×30 | 30 x 30 | 3.1-3.5 | 3-12 | 0.648 |
| FRP-ST-40×40 | 40 x 40 | 2.7-4 | 3-12 | 0.864-1.152 |
| FRP-ST-50×50 | 50 x 50 | 3-5 | 3-12 | 1.08-1.8 |
| FRP-ST-60×60 | 60 x 60 | 4-5 | 3-12 | 1.68-2.1 |
| FRP-ST-75×75 | 75 x 75 | 6 | 3-12 | 3.24 |
| FRP-ST-100×100 | 100 x 100 | 2.7-8 | 3-12 | 1.994-3.5 |
| FRP-ST-120×120 | 120 x 120 | 3.5-10 | 3-12 | 2.5-8.4 |
| FRP-ST-150×150 | 150 x 150 | 4-12 | 3-12 | 3.24-10.8 |
| FRP-ST-200×200 | 200 x 200 | 15 | 3-12 | 18 |
Performance Properties
| Property | Value | What This Means For You |
|---|---|---|
| Tensile Strength | 150-300 MPa | Good strength for a composite |
| Bending Strength | 200-300 MPa | Supports working loads within design limits |
| Bending Strength After Aging | 78% retention | Retains strength over time |
| Heat Resistance | Up to 186°C | Suitable for elevated-temperature applications |
| Cold Resistance | Down to -60°C | retains flexibility in freezing conditions |
| Chemical Resistance | 95% hardness after 24h in 3% HCl | Resists acid exposure |
| Salt Water Resistance | 89% hardness after 24h in 3% NaCl | suitable for marine use |
| Long-term Stability | Length change +0.03%, width -0.07% after 1000h | Maintains dimensional stability |
Applications
- Chemical Plants: Frames and supports where metal would corrode
- Water Treatment Facilities: Walkways and platforms exposed to moisture
- Electrical Installations: Support structures where non-conductivity is important
- Marine Environments: Boat parts, docks, and offshore structures
- Construction: Handrails, ladders, and structural supports
- Agriculture: Fencing and animal housing frames
Why Choose FRP Square Tubes?
| Feature | Real-World Benefit |
|---|---|
| Much lighter than steel | Easier to handle, transport, and install |
| No rusting or corroding | No painting or maintenance for long service life |
| Non-conductive | Suitable for electrical areas |
| Stable in temperature changes | has low thermal expansion |
| UV resistant | Resists UV degradation |
| Easy to cut and drill | Works with regular tools, no special equipment |
| Low thermal conductivity | Has low thermal conductivity |
Project References
Our FRP square tubes are used in water treatment, chemical processing, and coastal structures where corrosion resistance is important. Contact us for project references.
Frequently Asked Questions
How do FRP tubes compare to steel in strength?
Our FRP tubes have a tensile strength of 150-300 MPa, which is comparable to many structural steels, but they weigh only about 25% as much. For example, an FRP tube of the same size weighs much less than a steel tube.
How long will FRP tubes last outdoors?
In normal outdoor conditions, FRP tubes typically provide long service life. Installations in harsh environments have performed well over many years.
Can I paint FRP tubes?
Yes, though it’s usually not necessary. Our tubes come in standard colors (gray, yellow, green) and resist fading. If you need to paint them, light sanding followed by epoxy-based paint works best.
How do I cut and install FRP tubes?
You can cut them with a regular circular saw using a fine-tooth blade or an abrasive cutoff wheel. For drilling, standard drill bits work fine at moderate speeds. Joints can be made with mechanical fasteners (bolts or rivets) or structural adhesives.
Will FRP tubes sag over time?
No. Our testing shows minimal deformation even after 1000 hours of aging (+0.03% length change, -0.07% width change). This stability helps structures maintain alignment over time.
Can FRP tubes handle freezing temperatures?
Yes, they perform well from -60°C up to 186°C. Unlike metal, they retain properties across a wide temperature range, making them ideal for outdoor installations in any climate.
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.
