Product Overview
75 x 75 x 6 mm FRP square tubes are pultruded structural profiles made with continuous E-glass fibers in a thermoset resin matrix. The 75 mm external width and height with a 6 mm wall provide a weight of 3.06-3.3 kg/m. These tubes are used in industrial supports, platforms, railings, and chemical environments where corrosion resistance is required.
Detailed Specifications
| Property | Value | Notes |
|---|---|---|
| External Dimensions | 75 x 75 mm | Comparable to standard steel square tubes |
| Wall Thickness | 6 mm | Provides rigidity for medium-duty applications |
| Cross-sectional Area | 1670.0 mm2 | – |
| Moment of Inertia | 1.33×10^6 mm4 | Typical value |
| E-Modulus | 25000.0 MPa | Lower than steel; design accordingly |
| Weight | 3.06-3.3 kg/m | Substantially lighter than steel of equal external dimensions |
| Standard Length | 6 meters | Custom lengths available |
| Load Capacity (Compression) | 55-60 kN | Typical value; depends on end conditions and span |
| Temperature Resistance | -40 degrees C to +80 degrees C | Verify for extreme applications |
Key Benefits
Structural Performance
- High Strength-to-Weight Ratio: 75 x 75 x 6 mm tubes offer good structural capacity at a fraction of the weight of steel equivalents
- Suitable Rigidity: 6 mm wall thickness provides rigidity for frameworks, platforms, and support systems
- Dimensional Stability: Maintains shape under typical loads
Environmental Resistance
- Corrosion Resistance: FRP does not rust and resists many chemicals when the correct resin is selected
- Chemical Resistance: 6 mm walls resist degradation from acids, alkalis, and solvents in suitable formulations
- UV Stability: UV inhibitors can be added for outdoor applications
Economic Advantages
- Installation Efficiency: Lower weight can reduce handling and installation time
- Reduced Maintenance: No painting or galvanizing required for corrosion protection in many environments
- Lifecycle Cost: Total cost depends on application, environment, and design life; evaluate project-specifically
Applications
Industrial Settings
- Support Structures: Medium-duty platform supports
- Chemical Processing: Frames and supports in corrosive environments
- Cooling Towers: Structural supports exposed to cooling water chemicals
Construction Applications
- Safety Railings: Handrails and guardrails when designed to applicable standards
- Access Platforms: Walkway supports and ladder rungs
- Equipment Mounting: Frames for equipment up to moderate loads
Specialized Uses
- Electrical Installations: Non-conductive cable support structures
- Marine Structures: Supports near saltwater
- Agricultural Frameworks: Greenhouse and barn structural supports
Installation Guidelines
- Cutting: Use carbide-tipped blades at 2000-3000 RPM
- Drilling: Standard HSS drill bits at 800-1000 RPM
- Fastening: M8-M10 bolts through pre-drilled holes
- Spacing: Space vertical supports at 1.5-2.0 m intervals for typical loading
- Connections: 75 x 75 mm FRP connectors available for right-angle and T-joints
Appearance Options
| Color | RAL Code | Availability | Applications |
|---|---|---|---|
| Safety Yellow | RAL 1023 | Standard | Railings, visible supports |
| Light Gray | RAL 7035 | Standard | General construction, indoor use |
| White | RAL 9010 | Standard | Clean environments, food processing |
| Green | RAL 6024 | Standard | Outdoor, environmental applications |
| Custom Colors | Various | MOQ: 500 m | Available on special order |
Frequently Asked Questions
Q: How does the load capacity of 75 x 75 x 6 mm FRP tubes compare to steel?
A: FRP tubes have lower compressive stiffness and strength than steel of equal external dimensions, but they are substantially lighter. A 75 x 75 x 6 mm FRP tube can support medium structural loads when designed with appropriate safety factors. Consult an engineer for your specific load case.
Q: Can I use standard metal fittings with these tubes?
A: Standard 75 mm square tube metal fittings can be used, but specialized FRP connectors are recommended for optimal performance and corrosion matching.
Q: How much weight can a horizontal span support?
A: Capacity depends on span, end supports, and load distribution. For a 1-meter simply supported span, a typical load at mid-span may be in the range of 250-300 kg. For a 2-meter span, capacity is lower. Confirm with engineering calculations.
Q: Are these tubes suitable for outdoor stair railings?
A: Yes. The 75 mm width provides a comfortable grip and the 6 mm wall offers good rigidity. Railings must be designed to applicable safety standards and post spacing.
Q: How do I calculate how many tubes I need for my project?
A: For vertical supports, divide structure height by the standard 6 m length and add wastage. For platforms, calculate linear meters based on 1.5-2.0 m support spacing. Our engineering team can assist with quantity calculations.
Q: Can these tubes be painted?
A: They can be painted for aesthetics with light sanding, an epoxy-based primer, and an acrylic topcoat. Painting is not required for corrosion protection.
Related Products and Capabilities
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