FRP grating load capacity is governed by panel thickness, support span, and grating configuration. The table below presents approximate uniformly distributed load capacities at a deflection limit of L/180 for standard E‑glass/polyester panels, derived from ASTM D790 flexural behaviour and published manufacturer data. Load performance varies according to span length, bar spacing, panel thickness, and grating type; a single universal load rating is not applicable. For dynamic loads, concentrated loads, or spans outside the tabulated range, full engineering evaluation is required. Continuous operating temperature typically ranges from −40 °C to 100 °C depending on resin formulation.
The values below are intended for preliminary design comparison only. Do not use these approximations as a substitute for project‑specific structural verification. Always confirm capacity with the grating manufacturer using the exact panel dimensions, resin system, and support conditions.
| Span (mm) | Grating Type | Panel Thickness (mm) | Approx. Uniform Load (kN/m²) at L/180 | Typical Safety Factor | Data Reference |
|---|---|---|---|---|---|
| 600 | Molded Grating | 38 | 12.0 – 16.0 | 3:1 | ASTM D790 |
| 900 | Molded Grating | 38 | 5.0 – 7.5 | 3:1 | ASTM D790 |
| 1200 | Pultruded Grating | 50 | 3.0 – 5.0 | 3:1 | ASTM D790 |
| 600 | Heavy‑Duty Grating | 50 | 18.0 – 24.0 | 5:1 | ASTM D790 |
Disclaimer: Approximate uniform load ranges are based on typical panel configurations (e.g., 1 m × panel width) and simply supported boundary conditions. Actual capacity depends on resin type, glass content, bar spacing, and the presence of any cutouts or concentrated loads. For full engineering data, see the FRP Grating Load Tables. Service temperature limits are resin‑dependent; verify the manufacturer's continuous operating temperature for the selected resin system.
For further guidance on grating selection methodology, refer to the FRP Grating Selection Guide.