FRP grating (also known as FRP grating, composite grating) is a grid-like plate made of glass fiber as reinforcement material and unsaturated polyester resin as matrix through a special process. It is widely used in chemical, electric power, sewage treatment, shipbuilding, construction and other industries due to its excellent properties such as corrosion resistance, high strength, light weight, anti-slip and flame retardant.
FRP Grating Walkway‘s design, installation and purchasing guide for solar project
Selection of FRP grating specifications
Thickness: The mainstream choice is 25mm (load-bearing ≤1 ton/㎡) or 30mm (load-bearing ≤3 tons/㎡), which needs to be determined according to the load of the photovoltaic array operation and maintenance vehicle or personnel.
Hole spacing: 38×38mm (excellent anti-slip performance) or 40×40mm (higher light transmittance), and the hole type is recommended to choose micropores to enhance anti-slip performance.
Color: Yellow-green (warning function) or gray (dirt-resistant) is recommended, and an anti-ultraviolet coating can be added to the surface to extend the outdoor service life.
Material: Flame-retardant resin (oxygen index ≥28) and alkali-free glass fiber must be selected to avoid fire risks in photovoltaic areas.
Processing precautions
Cutting: It is recommended to use diamond cutting blades (thickness ≥2mm) to avoid fiber stratification. A 5mm margin should be reserved for the incision, and a resin edge sealant (such as epoxy resin) should be used to treat the cross section after grinding to prevent water absorption and aging.
Drilling: When the hole diameter is greater than 12mm, a stepped drill bit should be used, and the drilling speed should be controlled below 500rpm to avoid glass fiber drawing. The hole edge should be chamfered (R≥1mm) and sealed with glue.
Grinding: Use 80-120 grit sandpaper or tungsten steel grinding head to deal with burrs. The grinding direction should be along the grille texture to reduce fiber exposure.
Installation technical points
Fixed method:
Type of clamp:
M-type clamp (applicable to 25mm thick grille, bolt spacing ≤400mm)
L-type clamp (edge fixed, stainless steel self-tapping screws STS4.8×25 are required)
C-type clamp (used for cantilevered parts, wind load resistance needs to be verified)
Connector material: 304 stainless steel is recommended (316 stainless steel is required in coastal areas).
Support frame:
When the span is ≤1.2m, glass fiber reinforced plastic beams (cross section ≥50×50mm) can be used;
The steel frame needs to be hot-dip galvanized (zinc layer ≥80μm) or sprayed with Rust-Oleum anti-corrosion paint.
Seismic requirements:
Elastic gaskets (EPDM rubber, thickness ≥3mm) need to be set up in high-intensity areas to absorb vibration.
Procurement suggestions
Certification requirements: Products must provide ISO 9001 certification and SGS anti-aging test report (3000 hours QUV test).
Cost control:
For bulk purchases (≥500㎡), the manufacturer can be required to directly reserve installation holes during molding to reduce on-site processing costs.
Logistics protection:
It needs to be placed vertically during transportation, and EPE pearl cotton pads are used between layers to avoid lamination deformation.
Special environment response
Salt spray environment: Choose vinyl ester resin-based grilles, and the fixtures must pass a 480-hour neutral salt spray test.
Cold regions: Use low-temperature resin (-60℃ impact strength retention rate ≥ 80%).
If specific load calculation or installation plan optimization is required, it is recommended to provide a project geological survey report and photovoltaic array layout diagram for special design.
Product specifications and services of FRP grating
1. Common specifications
Grate size: common 1220×3660mm, 1000×4000mm, etc., can be customized.
Grate thickness: 25mm, 30mm, 38mm, 50mm, etc., optional for different load-bearing requirements.
Grid size: 19×19mm, 38×38mm, 50×50mm, etc., affecting drainage and anti-slip performance.
Color selection: yellow, green, gray, red, etc., corporate colors can be customized.
2. Customized service
Provide special-shaped cutting, punching, edging and other processing services.
Support special resin formulas (such as high temperature resistance, flame retardant, UV resistance, etc.).
Provide installation guidance and after-sales maintenance support.
Main Use
- FRP gratings are widely used, mainly including:
- Chemical industry: used for operating platforms, stair treads, fences, etc. in acid and alkaline environments.
- Sewage treatment plants: used as walkways, covers, filter gratings, etc., corrosion-resistant and long-lasting.
- Power industry: suitable for substations, cable trench covers, etc., with excellent insulation performance.
- Shipbuilding: used for decks, gangways, anti-slip walkways, etc., resistant to seawater corrosion.
- Construction industry: used for roof lighting, stair treads, trench covers, etc., light and beautiful.
- Food processing plants: suitable for humid and corrosive environments, in line with hygiene standards.
Application areas of FRP Grating
- Chemical industry: used in corrosive environments such as pickling workshops, electroplating plants, chemical plants, etc.
- Sewage treatment: used as sewage pool cover and walkway grating, corrosion-resistant and easy to clean.
- Oil platform: offshore drilling platform walkways, non-slip pedals, resistant to salt spray corrosion.
- Food processing: suitable for humid, easy-to-clean environments, FDA compliant.
- Transportation facilities: non-slip walkways in subway stations, airports, docks, etc.
- Power industry: substation insulation grilles, cable trench covers, etc.
The production of FRP grating mainly adopts the following processes:
Molding: After mixing glass fiber and resin, put them into the mold for high temperature and high pressure curing and molding, which is suitable for standard specification gratings.
Pultrusion molding: Produce grating profiles through pultrusion process, and then assemble them into grating plates, which are suitable for high-strength demand scenarios.
Hand lay-up molding: Suitable for customized special-shaped gratings, which are cured and molded after manual laying.
Vacuum infusion: The resin evenly penetrates the fiber under vacuum environment to improve the density and strength of the product.
High Strength
The specific strength of FRP is higher than that of steel, and the hoop tensile strength can reach more than 300MPa.
Corrosion Resistance
It can resist corrosion from chemical media such as acids, alkalis, salts, and organic solvents, and its service life is more than 30 years.
Light Weight
The density is only 1/4 of that of steel pipes, which is convenient for transportation and installation.
Low Friction Coefficient
The inner wall is smooth (roughness coefficient 0.0084), the hydraulic performance is excellent, and the conveying efficiency is high.
Good thermal insulation
Low thermal conductivity (0.25W/m·K), reducing heat energy loss.
Anti-aging&Electrical insulation
Anti-ultraviolet agent is added, suitable for outdoor and harsh environments. Non-conductive, suitable for power, communication and other fields.
OUR PROJECT
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How to choose the right FRP grating?
Choose thickness according to load-bearing requirements: light load (25mm), medium load (38mm), heavy load (50mm).
Consider the corrosive environment: choose a resin type that is resistant to acid, alkali and salt spray.
Anti-slip requirements: choose a sand surface or patterned surface treatment.
Color and aesthetics: choose the right color according to the use environment.
FRP grating has become an ideal substitute for traditional metal gratings due to its excellent corrosion resistance, high strength, light weight and long life. As a professional FRP grating manufacturer, we provide a variety of specifications and customized services, suitable for chemical, electric power, shipbuilding, construction and other fields. If you need to know more about the price, model and installation method of FRP grating, please consult!