FRP Grating (Fiberglass Reinforced Plastic Grating) is a lightweight, corrosion-resistant material widely used in industrial applications such as walkways, platforms, and flooring. Its load capacity depends on several factors, including its construction type, panel thickness, span length, and support conditions.
Factors Affecting FRP Grating Load Capacity
- Panel Thickness
- Thicker panels generally have higher load-bearing capacities. Common thicknesses range from 3/8 inch (9.5 mm) to 2 inches (50 mm), with thicker panels designed for heavier loads.
- Construction Type
- Molded FRP Grating: Made by molding fiberglass rods into a grid pattern. Typically used for lighter loads.
- Pultruded FRP Grating: Manufactured using continuous fibers for greater strength and stiffness. Suitable for heavy-duty applications.
- Span Length
- The distance between supports affects load capacity. Longer spans reduce the grating’s ability to bear weight. Manufacturers provide span charts to guide proper installation.
- Support Conditions
- Properly spaced and aligned supports are critical. Insufficient or uneven support can lead to sagging or failure under load.
- Load Types
- Uniform Load: Distributed evenly across the surface.
- Concentrated Load: Applied at specific points or areas.
- Point Load: Sudden forces that may exceed static load ratings.
Typical Load Capacities
| Grating Type | Thickness (inches) | Maximum Span (feet) | Load Capacity (lb/ft²) |
|---|---|---|---|
| Molded FRP Grating | 3/8″ | 2′ | 25-50 lb/ft² |
| Molded FRP Grating | 1″ | 4′ | 100-150 lb/ft² |
| Pultruded FRP Grating | 1″ | 6′ | 200-300 lb/ft² |
| Pultruded FRP Grating | 2″ | 8′ | 400-600 lb/ft² |
Note: These values are approximate and depend on the manufacturer’s specifications.
Load Capacities Specification
| 线性负载 CONCENTRATED LOAD | |||||||||
| 跨距 Span | 网孔尺寸 Mesh Size（mm） | 厚度 Thickness（mm） | 线性负载 Concentrated Load（kg/m） | 最大荷载 Max Load Capacity (kg/m) | |||||
| 75 | 150 | 300 | 450 | 600 | 750 | ||||
| 300mm | 38*38 | 25 | <0.25 | 0.42 | 1.12 | 1.71 | 2.38 | 2.86 | 5970 |
| 38*38 | 30 | <0.25 | 0.28 | 0.88 | 1.45 | 2.27 | 2.62 | 9924 | |
| 38*38 | 38 | / | <0.25 | 0.52 | 0.78 | 1.17 | 1.54 | 17120 | |
| 40*40 | 40 | / | <0.25 | 0.3 | 0.52 | 0.67 | 0.78 | 17010 | |
| 50*50 | 50 | 0.28 | 0.31 | 0.41 | 0.47 | 0.63 | 0.72 | 22526 | |
| 450mm | 38*38 | 25 | 0.56 | 1.15 | 2.16 | 3.08 | 4.16 | 4.76 | 3910 |
| 38*38 | 30 | 0.28 | 0.51 | 1.13 | 1.53 | 20.9 | 2.63 | 4828 | |
| 38*38 | 38 | <0.25 | 0.47 | 0.91 | 1.36 | 1.86 | 2.33 | 12980 | |
| 40*40 | 40 | <0.25 | 0.48 | 0.92 | 1.37 | 1.87 | 2.35 | 12680 | |
| 50*50 | 50 | 0.31 | 0.42 | 0.74 | 0.92 | 1.22 | 2.21 | 17078 | |
| 600mm | 38*38 | 25 | 0.87 | 1.71 | 3.51 | 5.2 | 6.72 | / | 2924 |
| 38*38 | 30 | 0.53 | 1.29 | 2.31 | 3.62 | 4.82 | 5.96 | 4089 | |
| 38*38 | 38 | 0.36 | 0.65 | 1.25 | 1.35 | 2.47 | 3.08 | 8720 | |
| 40*40 | 40 | 0.38 | 0.67 | 1.28 | 1.89 | 2.51 | 3.38 | 8498 | |
| 50*50 | 50 | 0.35 | 0.58 | 1.06 | 1.76 | 2.16 | 2.56 | 11473 | |
| 750mm | 38*38 | 25 | 1.36 | 4.47 | 9.37 | / | / | / | 2287 |
| 38*38 | 30 | 1.27 | 2.61 | 4.91 | 7.44 | 11.06 | / | 3175 | |
| 38*38 | 38 | 0.63 | 1.14 | 2.17 | 3.24 | 4.36 | 5.45 | 7270 | |
| 19*19/38*38 | 30 | 0.97 | 1.86 | 3.12 | 5.02 | 6.88 | 9.36 | 4820 | |
| 19*19/38*38 | 38 | 0.56 | 1.02 | 1.94 | 2.98 | 3.88 | 5.02 | 8827 | |
| 40*40 | 40 | 0.65 | 1.18 | 2.23 | 3.36 | 4.24 | 5.49 | 6970 | |
| 50*50 | 50 | 0.46 | 0.91 | 1.58 | 2.36 | 3.46 | 4.57 | 9566 | |
| 900mm | 38*38 | 25 | 2.91 | 5.92 | 12.12 | / | / | / | 1948 |
| 38*38 | 30 | 1.79 | 3.91 | 7.76 | 11.51 | / | / | 2641 | |
| 38*38 | 38 | 0.87 | 1.81 | 3.68 | 5.56 | 7.42 | 9.31 | 5817 | |
| 40*40 | 40 | 0.91 | 1.84 | 3.75 | 5.69 | 7.57 | 9.71 | 5537 | |
| 50*50 | 50 | 1.51 | 1.67 | 3.37 | 4.33 | 5.16 | 6.13 | 7780 | |
| 1220mm | 38*38 | 25 | 5.72 | 11.64 | / | / | / | / | 1431 |
| 38*38 | 30 | 3.61 | 7.91 | 14.37 | / | / | / | 2286 | |
| 38*38 | 38 | 2.26 | 4.75 | 9.68 | 14.63 | / | / | 3755 | |
| 40*40 | 40 | 2.35 | 5.02 | 9.87 | 15.01 | / | / | 3455 | |
| 50*50 | 50 | 1.67 | 3.41 | 6.94 | 8.72 | 10.52 | 13.32 | 5834 | |
| 均布负载 UNIFORM LOAD | ||||||||||
| 跨距 Span | 网孔尺寸 Mesh Size（mm） | 厚度 Thickness（mm） | 均布负载 Uniform Load（kg/m） | 最大荷载 Max Load Capacity (kg/m) | ||||||
| 150 | 350 | 500 | 750 | 1000 | 1500 | 2500 | ||||
| 300mm | 38*38 | 25 | <0.25 | <0.25 | <0.25 | <0.25 | 0.26 | 0.53 | 0.64 | 31625 |
| 38*38 | 30 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | 0.42 | 0.53 | 33000 | |
| 38*38 | 38 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | 0.42 | 41800 | |
| 40*40 | 40 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | 0.42 | 39710 | |
| 50*50 | 50 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | <0.25 | 0.39 | 53602 | |
| 450mm | 38*38 | 25 | 0.3 | 0.38 | 0.62 | 0.94 | 1.22 | 1.85 | 2.75 | 20759 |
| 38*38 | 30 | 0.25 | 0.32 | 0.52 | 0.78 | 1.02 | 1.54 | 2.29 | 21662 | |
| 38*38 | 38 | 0.2 | 0.25 | 0.41 | 0.62 | 0.81 | 1.22 | 1.81 | 27439 | |
| 40*40 | 40 | 0.2 | 0.25 | 0.41 | 0.62 | 0.81 | 1.22 | 1.81 | 26067 | |
| 50*50 | 50 | <0.25 | <0.25 | 0.3 | 0.45 | 0.59 | 0.89 | 1.32 | 35186 | |
| 600mm | 38*38 | 25 | 0.98 | 1.24 | 1.85 | 2.75 | 3.35 | 5.18 | 8.86 | 12439 |
| 38*38 | 30 | 0.82 | 1.03 | 1.54 | 2.29 | 2.79 | 4.32 | 7.38 | 12980 | |
| 38*38 | 38 | 0.65 | 0.81 | 1.22 | 1.81 | 2.2 | 5.64 | 14.1 | 16441 | |
| 40*40 | 40 | 0.65 | 0.81 | 1.22 | 1.81 | 2.2 | 6.43 | / | 15619 | |
| 50*50 | 50 | 0.47 | 0.59 | 0.89 | 1.32 | 1.61 | 4.69 | 6.13 | 21083 | |
| 750mm | 38*38 | 25 | 1.28 | 3.05 | 4.57 | 6.86 | 9.15 | / | / | 7950 |
| 38*38 | 30 | 1.07 | 2.54 | 3.81 | 5.72 | 7.62 | 11.69 | / | 8296 | |
| 38*38 | 38 | 0.48 | 2.01 | 3.01 | 4.51 | 6.92 | / | / | 10508 | |
| 40*40 | 40 | 0.84 | 2.01 | 3.01 | 4.51 | 8.91 | / | / | 9983 | |
| 50*50 | 50 | 0.62 | 1.46 | 2.19 | 3.29 | 6.5 | 9.23 | / | 13475 | |
| 900mm | 38*38 | 25 | 2.57 | 7.13 | 9.62 | / | / | / | / | 5518 |
| 38*38 | 30 | 2.14 | 4.58 | 7.11 | 10.67 | / | / | / | 5758 | |
| 38*38 | 38 | 1.69 | 3.62 | 5.61 | 8.42 | / | / | / | 7293 | |
| 40*40 | 40 | 1.69 | 3.62 | 5.61 | 8.42 | 11.18 | / | / | 6929 | |
| 50*50 | 50 | 1.23 | 2.64 | 4.09 | 6.14 | 8.15 | / | / | 9353 | |
| 1220mm | 38*38 | 25 | 7.1 | 9.9 | 12.46 | / | / | / | / | 2827 |
| 38*38 | 30 | 5.91 | 8.25 | 11.78 | / | / | / | / | 3392 | |
| 38*38 | 38 | 4.67 | 6.51 | 9.3 | 13.95 | / | / | / | 4297 | |
| 40*40 | 40 | 1.69 | 3.62 | 5.61 | 8.32 | 11.18 | / | / | 6929 | |
| 50*50 | 50 | 3.4 | 4.75 | 6.78 | 9.16 | 12.07 | / | / | 5510 | |
| 点负载 POINT LOAD | ||||||||||
| 跨距 Span | 网孔尺寸 Mesh Size（mm） | 厚度 Thickness（mm） | 点负载 Point Load (kg/m) | |||||||
| 150 | 350 | 500 | 750 | 1000 | 1500 | 2500 | 3000 | |||
| 300mm | 38*38 | 25 | / | 0.44 | 0.59 | 1.03 | 1.37 | 1.78 | 2.82 | 3.49 |
| 38*38 | 30 | / | 0.37 | 0.49 | 0.86 | 1.14 | 1.48 | 2.35 | 2.91 | |
| 38*38 | 38 | / | 0.29 | 0.39 | 0.68 | 0.9 | 1.17 | 1.86 | 2.29 | |
| 40*40 | 40 | / | 0.26 | 0.35 | 0.61 | 0.81 | 1.05 | 1.67 | 2.06 | |
| 50*50 | 50 | / | 0.37 | 0.48 | 0.76 | 1.08 | 1.47 | 2.41 | 2.89 | |
| 450mm | 38*38 | 25 | 0.26 | 0.66 | 0.89 | 1.55 | 2.06 | 2.67 | 4.23 | 5.23 |
| 38*38 | 30 | / | 0.55 | 0.74 | 1.29 | 1.72 | 2.23 | 3.53 | 4.36 | |
| 38*38 | 38 | / | 0.43 | 0.59 | 1.02 | 1.36 | 1.76 | 2.78 | 3.44 | |
| 40*40 | 40 | / | 0.43 | 0.59 | 1.02 | 1.36 | 1.76 | 2.78 | 3.44 | |
| 50*50 | 50 | 0.27 | 0.56 | 0.73 | 1.14 | 1.63 | 2.2 | 3.61 | 4.34 | |
| 600mm | 38*38 | 25 | 0.74 | 1.55 | 2.02 | 3.18 | 4.52 | 6.12 | / | / |
| 38*38 | 30 | 0.62 | 1.29 | 1.68 | 2.65 | 3.77 | 5.1 | 8.37 | / | |
| 38*38 | 38 | 0.49 | 1.02 | 1.33 | 2.09 | 2.97 | 4.03 | 6.71 | / | |
| 40*40 | 40 | 0.47 | 0.98 | 1.25 | 1.89 | 2.69 | 3.78 | 6.51 | / | |
| 50*50 | 50 | 0.39 | 0.83 | 1.08 | 1.69 | 2.41 | 3.26 | 5.35 | 6.42 | |
| 750mm | 38*38 | 25 | 1.26 | 2.94 | 3.78 | 5.99 | 8.79 | / | / | / |
| 38*38 | 30 | 1.05 | 2.45 | 3.15 | 4.99 | 7.33 | / | / | / | |
| 38*38 | 38 | 0.83 | 1.93 | 2.49 | 3.94 | 5.78 | 7.84 | / | / | |
| 40*40 | 40 | 0.82 | 1.91 | 2.35 | 3.8 | 5.59 | 7.56 | / | / | |
| 50*50 | 50 | 0.67 | 1.57 | 2.01 | 3.19 | 4.68 | 6.33 | 9.87 | / | |
| 900mm | 38*38 | 25 | 1.78 | 4.32 | 5.53 | 8.81 | 13.06 | / | / | / |
| 38*38 | 30 | 1.48 | 3.6 | 4.61 | 7.34 | 10.88 | / | / | / | |
| 38*38 | 38 | 1.17 | 2.84 | 3.64 | 5.8 | 8.59 | 11.65 | / | / | |
| 40*40 | 40 | 1.16 | 2.81 | 3.58 | 5.69 | 8.35 | 11.15 | / | / | |
| 50*50 | 50 | 0.95 | 2.3 | 2.95 | 4.69 | 6.96 | 10.11 | / | / | |
| 1220mm | 38*38 | 25 | 2.95 | 7.42 | 10.38 | 15.06 | / | / | / | / |
| 38*38 | 30 | 2.46 | 6.18 | 8.65 | 12.55 | / | / | / | / | |
| 38*38 | 38 | 1.94 | 4.88 | 6.83 | 9.91 | 14.56 | / | / | / | |
| 40*40 | 40 | 1.93 | 4.85 | 6.68 | 9.7 | 14.31 | / | / | / | |
| 50*50 | 50 | 1.57 | 3.95 | 5.53 | 8.02 | 10.71 | 15.53 | / | / | |
How to Determine Load Capacity
- Identify the Application Requirements
- Determine the expected uniform and concentrated loads for your application.
- Consult Manufacturer Specifications
- Each manufacturer provides detailed load charts based on grating type, thickness, and span.
- Use Engineering Calculations
- For custom designs, engineers use formulas like the flexural strength formula to calculate load capacity:Flexural Strength=σy
Where:
- σ = Allowable stress of the material
- y = Distance from the neutral axis to the outermost fiber
- For custom designs, engineers use formulas like the flexural strength formula to calculate load capacity:
- Consider Safety Factors
- Always incorporate a safety factor (typically 1.5–2.0) to account for unexpected loads or environmental factors.
Applications Based on Load Capacity
- Light-Duty Applications: Walkways, maintenance platforms, and light pedestrian traffic (e.g., molded FRP grating).
- Medium-Duty Applications: Industrial platforms, equipment access areas, and moderate vehicle traffic (e.g., pultruded FRP grating).
- Heavy-Duty Applications: High-traffic areas, heavy equipment support, and structural flooring (e.g., thick pultruded FRP grating).
Conclusion
The load capacity of FRP Grating varies based on its design, thickness, and intended use. Always consult the manufacturer’s specifications and follow recommended guidelines for installation and support. By selecting the right grating type and ensuring proper installation, you can ensure safe and reliable performance in your application.
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