Moulded GRP Grating Systems
Moulded GRP grating is manufactured using continuous interwoven glass fibres fully encapsulated within a resin matrix to create a bi-directional structural mesh. This construction allows loads to be distributed in both directions while providing excellent corrosion resistance, slip resistance and long-term durability.
The material is widely specified for industrial flooring, access platforms, walkways, trench covers, service ducts and infrastructure projects where traditional steel grating may be susceptible to corrosion or require ongoing maintenance.
Available in a range of panel depths, mesh configurations and resin systems, moulded GRP grating can be selected according to loading requirements, support centres and environmental conditions.
For a comparison of moulded and pultruded grating, see our GRP grating overview.
Moulded GRP Grating Performance Characteristics
| Characteristic | Description |
|---|---|
| Slip Resistance | Available with gritted or concave walking surfaces for wet, oily and external environments. |
| Corrosion Resistance | Resistant to moisture, saltwater and many industrial chemicals. |
| Load Distribution | Bi-directional mesh construction distributes loads in both directions. |
| Weight | Significantly lighter than steel alternatives. |
| Electrical Conductivity | Non-conductive material suitable for electrical environments. |
| Fire Performance | Fire-retardant resin systems available. |
| Panel Depths | Common depths include 25mm, 38mm and 50mm. |
| Mesh Configurations | Available in standard and mini mesh formats. |
| Resin Systems | Orthophthalic, Isophthalic and Vinyl Ester resin options available. |
| Typical Applications | Walkways, platforms, flooring, trench covers and access systems. |
Manufacturing Process & Structural Design
Moulded GRP grating is produced by placing continuous glass fibre reinforcements into a mould before fully encapsulating them within a thermosetting resin system. The resulting one-piece panel provides consistent structural performance throughout the grating and allows loads to be transferred across the mesh in both directions.
This manufacturing method differs from pultruded grating, which relies on unidirectional bearing bars for load carrying. As a result, moulded grating is often selected where load distribution, cut-out flexibility and corrosion resistance are key design requirements.
Unlike pultruded grating — which relies on glued joints — moulded grating avoids delamination or joint failure under continuous traffic, impact, or long-term exposure.
Panel Options & Configurations
| Specification | Options |
|---|---|
| Colours | Standard grey, green and yellow, with BS/RAL colours available. |
| Surface Finish | Gritted and concave finishes available. |
| Resin Systems | Orthophthalic, Isophthalic and Vinyl Ester. |
| Edge Banding | Available where required. |
| Fabrication | Panels can be cut to project-specific dimensions. |
| Mesh Types | Standard mesh and mini mesh configurations available. |
Typical Applications Of Moulded GRP Grating
Moulded GRP grating is commonly installed within water treatment facilities, chemical processing plants, offshore installations, utilities infrastructure, industrial platforms, rooftop walkways and service access systems.
The material is particularly suited to environments where corrosion resistance, slip resistance and low maintenance requirements are important design considerations.
Moulded GRP Grating In Use
Need moulded grating cut to size? Send us your layout or panel sizes and we’ll recommend the right depth and quote.
Choose by Thickness
25mm GRP Grating
Lightweight 25mm open mesh for walkways and general access areas.
Moulded GRP Grating – FAQs
It is widely used on walkways, platforms, stairs, ramps, jetties, chemical plants, wastewater sites, roof access routes and anywhere that requires a safe, anti-slip surface.
Unlike steel, GRP does not rust, requires minimal maintenance and is significantly lighter. It also offers excellent slip resistance and electrical insulation.
Yes. The gritted surface is moulded into the panel rather than added as a coating, giving long-term slip resistance even under heavy use.
Panels can be cut to suit your required dimensions and shapes. We can supply cut panels or provide guidance on safe cutting methods on site.
Yes. Standard colours are available, with other BS/RAL colour options to help with zone marking, branding or safety demarcation.
Fire-retardant grades are available to help meet the fire performance requirements of specific projects.
Because there are no glued joints between bearing bars, the loads from people, trolleys or machinery are spread through the whole mesh. This reduces local stress points and the risk of joint failure under constant or cyclic loading, which can be a concern with mechanically fixed or bonded systems.
Moulded GRP grating is typically manufactured using glass fibre reinforcement saturated with polyester, vinyl ester or phenolic resin, depending on the performance required. The combination of high glass content and chemical-resistant resins gives a strong, rigid panel with excellent corrosion resistance and long service life.
The anti-slip surface is typically applied during the moulding process, embedding hard grit particles into the top layer while the resin is still curing. This creates a long-lasting, bonded anti-slip finish that will not peel off like a surface coating and maintains slip resistance even in wet or oily conditions.
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