FRP (Fiber Reinforced Plastic) trench covers are drainage system components made from glass fiber reinforced plastic. Widely used in buildings, industrial facilities, and public infrastructure, they serve as a modern alternative to traditional metal or concrete covers. Their key advantages lie in combining lightweight properties with high strength and excellent weather resistance.

Material Properties and Structure

• Composite Construction: FRP trench covers are made by combining glass fiber reinforcements with resin matrices such as polyester or vinyl ester, creating a durable composite.
• Corrosion Resistance: They are unaffected by acids, alkalis, salts, or chemical exposure, making them suitable for industrial or coastal environments.
• UV Resistance: A UV-stable coating is typically applied to prevent degradation under prolonged sun exposure.

Key Advantages

• Lightweight: Weighing only one-third to half the weight of traditional cast iron, they reduce transportation and installation costs.
• High Load Capacity: Some models withstand over 5 tons of dynamic load, ideal for driveways and areas with heavy machinery.
• Theft Prevention: With no resale value, FRP covers eliminate the theft issues common with metal materials.
• Low Maintenance: No painting needed and resistant to buildup—cleaning requires only high-pressure water rinsing.

Application Scenarios

Specifications and Customization

• Size Flexibility: Standard lengths up to 6 meters, customizable width and thickness.
• Color Options: Available in transparent, blue, green, white, and more; RAL color customization supported.
• Integrated Accessories: Can be paired with brackets, end caps, and downpipes to create complete drainage solutions.

Environmental Benefits

• FRP manufacturing emits 40% less carbon compared to cast iron.
• Service life can exceed 25 years, reducing material consumption.
• Post-use, materials can be crushed and reused as filler, aligning with circular economy goals.
• Major suppliers offer warranties of over 10 years.
• Recommended installation involves securing supports every 1.5 meters to ensure structural integrity.

How Long Does an FRP Trench Last?

Typical service life for FRP trench covers ranges from 25 to 50 years, significantly longer than metal alternatives. Key factors affecting lifespan include:

• Material Quality: Products made with high-strength fibers and UV-resistant resins can last up to 50 years.
• Installation Quality: Professional installation may extend lifespan by 10–15 years.
• Environmental Conditions:
  • Coastal Areas: Salt-resistance ensures lifespans over 30 years.
  • Industrial Zones: Outlast metal by 3–5x due to chemical resistance.
• Maintenance: Annual cleaning can extend life by 20%. Paint-free surfaces reduce upkeep.

Comparison With Traditional Materials

Real-World Case Studies

• Coastal Homes in Taiwan: After 25 years, tensile strength declined by only 12%—still in use.
• Chemical Plants: 18 years of continuous use with no perforation, only a 30% loss in surface gloss.
• Extreme Climate Testing: Simulated -40°C to +80°C cycles showed the structure intact after a 50-year aging simulation.

Recommended Installation and Maintenance Practices

• Installation: Ensure support spacing ≤1.5 meters to prevent sagging.
• Cleaning: Use neutral detergents and soft brushes; avoid high-pressure jets on seams.
• Inspection: Check resin coating every 2 years; minor touch-ups can extend life by 5–8 years.

Leading suppliers like All Leader offer warranties up to 15 years, with some high-end models covered for 25 years—far surpassing the average 20-year lifespan of aluminum alternatives.

Is FRP More Expensive Than Traditional Trench Covers?

Yes, FRP trench covers generally have higher upfront costs compared to aluminum, PVC, or galvanized steel. However, their superior durability and minimal maintenance needs make them more cost-effective over time.

Installation Cost Comparison

While FRP trench covers cost more to install initially, their long service life (25–50 years) and low maintenance offer significant lifecycle savings. This makes them ideal for industrial settings or coastal areas that demand robust, long-term solutions.

Material Comparison Summary

Conclusion

Although FRP trench covers have a higher initial cost than PVC or aluminum, their exceptional corrosion resistance, low maintenance, and long service life (up to 50 years) make them a smart investment for projects requiring durability and reliability. They're especially suitable for industrial facilities, coastal environments, and ESG-conscious developments, while traditional materials may suffice for short-term or budget-constrained projects.