FRP Grating Sizes: Mesh, Depth and Panel Guide
Created on 09.14
FRP grating is widely used for industrial walkways, operating platforms, drainage covers, trench covers and maintenance access areas exposed to moisture or corrosive chemicals. Compared with steel grating, molded fiberglass reinforced plastic grating does not rust and can reduce repeated painting and corrosion-related maintenance.
Selecting the correct grating requires more than choosing a panel color. The mesh dimensions, grating depth, available mold size, resin system, surface, support span and design load must all match the operating environment. This guide lists the complete range of FRP molded grating sizes currently available from Hebei Yingnai Environmental Protection Technology Co., Ltd.
How to Read an FRP Grating Model
Our grating models use the format L × M × H, with all values expressed in millimetres:
- L:
- M:
- H:
For example, 38 × 38 × 38 mm identifies a grating model with 38 × 38 mm grid dimensions and a depth of 38 mm. The available mold dimensions in the table describe the standard full-panel production sizes.
Complete FRP Molded Grating Size Table
No. | Model dimensions (mm) | Available mold dimensions (m) | Approx. weight (kg/m²) | Upper rib width (mm) | Lower rib width (mm) | Configuration |
1 | 100 × 100 × 50 | 1.22 × 3.66 | 12 | 7 | 5 | Standard mesh |
2 | 40 × 40 × 25 | 1.00 × 4.04 | 7 | 6 | 5 | Standard mesh |
3 | 38 × 38 × 25 | 1.22 × 3.66; 1.52 × 4.08 | 13 | 7 | 5 | Standard mesh |
4 | 38 × 38 × 30 | 1.22 × 3.66; 1.22 × 4.04 | 19 | 7 | 5 | Standard mesh |
5 | 38 × 38 × 38 | 1.22 × 3.66; 1.535 × 4.01; 1.00 × 4.00 | 22 | 7 | 5 | Standard mesh |
6 | 40 × 40 × 40 | 1.00 × 4.04 | 24 | 7 | 5 | Standard mesh |
7 | 38 × 38 × 50 | 1.22 × 3.66; 1.00 × 4.04 | 28 | 8 for 1.22 × 3.66 panel; 7.5 for 1.00 × 4.04 panel | 5 | Standard mesh |
8 | 50 × 50 × 50 | 1.22 × 3.66; 1.00 × 4.04 | 24 | 7.3 | 5 | Standard mesh |
9 | 38 × 38 × 65 | 1.03 × 4.04 | 39 | 9 | 5 | Standard mesh |
10 | 50 × 50 × 65 | 1.22 × 4.01 | 28 | 8 | 4.5 | Standard mesh |
11 | 19 × 19 × 30 | 1.22 × 3.66 | 19 | 7 | 5 | Double-layer micro-mesh |
12 | 12 × 12 × 38 | 1.22 × 3.66; 1.00 × 4.04 | 25 | 7 | 5 | Double-layer micro-mesh |
13 | 25 × 25 × 25 | 1.22 × 4.02 | 16 | 6.5 | 5 | Standard mesh |
14 | 25 × 25 × 50 | 1.22 × 3.66 | 24 | 7 | 5 | Double-layer micro-mesh |
15 | 20 × 20 × 20 | 0.765 × 3.00 | 17 | 5.6 | 4 | Standard mesh |
16 | 35 × 35 × 10 | 0.93 × 2.00 | 5.5 | 6 | 5 | Standard mesh |
All dimensions and weights are nominal production data. Availability and final specifications should be confirmed for each order.
Standard Mesh and Micro-Mesh Options
Standard square-mesh grating is commonly selected for platforms, walkways and general industrial access. The open structure allows drainage and ventilation while keeping the panel relatively light.
Double-layer micro-mesh options use a smaller upper opening. They are useful where the project requires a reduced opening size or improved walking comfort. Current micro-mesh models include:
- 19 × 19 × 30 mm
- 12 × 12 × 38 mm
- 25 × 25 × 50 mm
The final selection still depends on the required load, support arrangement, clear span and operating environment.
Available Materials and Resin Systems
Yingnai molded grating is manufactured from resin and alkali-free glass fibre. Available resin systems include:
- Orthophthalic polyester
- Isophthalic polyester
- Vinyl ester
- Phenolic resin systems
The appropriate resin must be selected according to the chemical medium, concentration, operating temperature, exposure conditions and project requirements. Flame-retardant formulations and custom colors can be discussed when required.
Key Benefits of FRP Grating
Corrosion resistance
FRP grating does not rust like unprotected carbon steel. It is suitable for humid, wastewater, seawater and many chemical-service environments when the correct resin system is selected.
Low weight and easier installation
The relatively low panel weight can simplify handling, field cutting and installation. It is useful for renovation projects and maintenance areas where heavy lifting access is limited.
Electrical insulation and non-magnetic properties
FRP is electrically non-conductive and non-magnetic, making it an option for projects where metallic flooring is undesirable. Project-specific electrical and safety requirements must still be confirmed before selection.
Slip-resistant surface options
Industrial walkways frequently require safer footing in wet conditions. Surface configuration and slip-resistance requirements should be specified with the inquiry so that the appropriate finish can be selected.
Custom cutting
Full panels can be cut for platforms, trenches, equipment openings and irregular areas. Cut dimensions, edge support, penetrations and fixing requirements should be reviewed before fabrication.
Typical Applications
FRP molded grating is commonly considered for:
- Chemical plant walkways and operating platforms
- Wastewater treatment plants and pumping stations
- Desalination and seawater facilities
- Drainage channels and trench covers
- Shipyards, ports and coastal facilities
- Mining and mineral-processing areas
- Power plant maintenance platforms
- Food-processing facilities
- Equipment access platforms and tower internals
How to Select the Correct FRP Grating
Please provide the following information when requesting a quotation:
- Required mesh and grating depth
- Required panel or cut-piece dimensions
- Uniform and concentrated design loads
- Clear support span and support direction
- Chemical medium, concentration and operating temperature
- Resin and flame-retardant requirements, if specified
- Surface type and slip-resistance requirements
- Color and quantity
- Cut-outs, clips, fasteners and installation drawings
Load capacity cannot be determined from grating depth alone. The model, span, support arrangement, load type and service conditions must be reviewed together before the final specification is confirmed.
Request a Size and Selection Review
Hebei Yingnai Environmental Protection Technology Co., Ltd. supplies FRP/GRP gratings, covers and platforms for chemical, wastewater, seawater, mining and other corrosion-prone industrial areas.
Send your required panel dimensions, load, support span and operating conditions for a specification review and quotation.
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