Composite Drainage Grating Solutions
Composite materials (Fiber Reinforced Plastic - FRP), offer the most effective solution against corrosion and theft risks at every point, from industrial facilities to urban infrastructure. Despite their heavy-duty load capacities, they are significantly lighter than their metal counterparts.
Why Choose Composite Gratings?
Total Corrosion Resistance: They do not rust, rot, or decay, showing excellent resistance to chemical substances. Ideal for coastal areas and chemical plants.
Zero Theft Risk: Since they have no scrap value, they prevent theft incidents in urban applications.
Lightweight and Easy Installation: Approximately 70% lighter than steel gratings. This allows for fast and low-cost installation without the need for cranes.
High Load-Bearing Capacity: Thanks to specialized production techniques (SMC/BMC and Pultrusion), they fully comply with heavy vehicle traffic classes (D400).
Electrical Insulation: Non-conductive and does not create magnetic fields. It is the safest choice for energy transmission lines and transformer stations.
What to Consider When Choosing Drainage Gratings?
Choosing the right grating is not just about selecting a "cover"; it determines the lifespan of the project. The following criteria should be considered:
Load Class Analysis: What is the maximum weight that will pass over the grating? Is it just a pedestrian path or heavy-duty fire trucks? (The correct class from A15 to D400 must be selected according to EN 124-5 standards).
Environmental Factors: Is the application area on the coast, a factory using acidic chemicals, or a parking lot with intense sun exposure? Materials should be selected based on corrosion risk.
Hydraulic Capacity: The openings on the grating must be capable of discharging the intense rainfall in the region.
Security and Locking: Gratings should have locking mechanisms to prevent displacement or unauthorized removal. Additionally, an anti-slip surface texture is essential for pedestrian safety.
How Many Tons Can Composite Gratings Withstand?
Contrary to popular belief, composite (GRP/SMC) gratings have a strength that rivals or even exceeds their metal counterparts. Durability varies according to raw material density and production technique:
Class A15 (1.5 Tons): For pedestrians and cyclists only.
Class B125 (12.5 Tons): Sidewalks and passenger car parking lots.
Class C250 (25 Tons): Curbsides and low-speed traffic areas.
Class D400 (40 Tons): Main roads and areas open to heavy vehicle traffic.
Ductile Iron vs. Composite Gratings: Which is More Advantageous?
| Feature | Ductile Iron (Spheroidal/Cast) | Composite (GRP/SMC) |
| Corrosion | Rusts over time, requires maintenance. | Non-corrosive, resistant to acids. |
| Weight | Very heavy, difficult to install. | Lightweight, saves on labor costs. |
| Theft Risk | High scrap value, prone to theft. | No scrap value, secure. |
| Noise | Makes metallic noise during vehicle passage. | Absorbs sound, silent. |
| Cost | Variable based on raw material prices. | More profitable with long life & zero maintenance. |
Technical Comparison Table
| Feature | Composite (GRP) | Ductile Iron | Steel Grating |
| Corrosion Resistance | Excellent | Low | Medium (Galvanized) |
| Weight | Very Light | Very Heavy | Heavy |
| Theft Risk | None | High | Medium |
| Maintenance Cost | None | Requires Paint/Care | Requires Regular Inspection |
| Insulation | Fully Insulative | Conductive | Conductive |
Application Areas
Chemical and Food Industry: Acidic and basic environments.
Water Treatment Plants: Humid and corrosive areas.
Transportation and Highways: Bridges, tunnels, and highway drainage.
Ports and Marinas: Areas requiring protection against saltwater corrosion.
