FRP Gratings

Publish Date: October 11, 2026

MuiGrate FRP gratings provide corrosion-resistant, non-conductive and anti-slip access surfaces for walkways, platforms, drains, trenches, treatment plants, industrial facilities, data centres, substations, solar installations and construction sites.

Mui Fatt was the first maker of moulded FRP grating in Malaysia, and makes it in Port Klang, Selangor.

MuiGrate is available in both moulded and pultruded FRP grating. Moulded grating provides strength in both directions through its one-piece open-mesh construction, while pultruded grating uses load-bearing bars running in one direction for applications where one-way span performance is important.

Gratings can be factory cut to the required dimensions, helping contractors, councils and industrial users avoid cutting full panels on site.

MuiGrate FRP Gratings in Malaysia

MuiGrate is Mui Fatt's range of fibreglass reinforced plastic (FRP) grating and related access products. FRP grating does not rust, is resistant to many corrosive environments and is non-conductive, making it suitable for applications where conventional steel grating may require more maintenance or where electrical insulation is important.

The range includes moulded FRP grating, pultruded FRP grating, stair treads, FRP manhole and sump covers, light-duty septic tank manhole covers and site safety floor sheets for temporary walkways.

MuiGrate gratings are intended for pedestrian traffic in accordance with BS 4592 and are not for vehicle loads.

Moulded FRP Grating

Moulded FRP grating is manufactured as a one-piece open-mesh panel, with reinforcing fibres running in both directions. This gives the grating two-way strength without welded joints. The open mesh also allows water and other liquids to drain through the walking surface.

Moulded grating is available in different thicknesses, mesh configurations and open areas. Standard panels can be cut at the factory to suit the required width and length, including pipe cut-outs and other shapes where required.

Moulded FRP Grating Models and Sizes

Factory Cut-to-Size FRP Grating

MuiGrate moulded grating can be cut to the required width and length before shipment. The factory can supply pieces up to the full panel size, with a cutting tolerance of ±5 mm.

• Custom width and length
• Factory cutting to ±5 mm
• Pipe cut-outs available
• Odd shapes available on request
• Pieces smaller than 300 × 300 mm require consultation
• Custom colours available on request

Ready-cut sizes include 4 ft × 8 ft (1220 × 2440 mm) and 4 ft × 4 ft (1220 × 1220 mm).

Pultruded FRP Grating

Pultruded FRP grating is made with load-bearing bars running in one direction. The pultruded bars contain approximately 65% glass and 35% resin. This construction provides high one-way strength and is suitable where the grating needs to span in the direction of the load-bearing bars.

Pultruded grating is available in different depths and panel widths. It can also be supplied as framed and hinged covers for trenches and access openings.

Pultruded FRP Grating Models

Standard pultruded panel widths include 914 mm, 1220 mm and 1524 mm. Available lengths include 2438 mm, 3048 mm, 5486 mm and 6096 mm.

Framed and Hinged Pultruded Covers

Pultruded grating can be supplied as framed and hinged covers in 25 mm, 38 mm and 50 mm heights. Frame options include hot-dip galvanised mild steel, FRP or grating-only configurations, while hinge options include aluminium, mild steel and stainless steel.

Covers can be supplied up to 4 ft wide and 4 m long. Wider openings can use double-leaf covers. For openings longer than 4 m, contact Mui Fatt for requirements.

Moulded vs Pultruded FRP Grating

In simple terms, pultruded grating is suited to applications where the load needs to span further in one direction. Moulded grating provides strength in both directions, better impact resistance and greater flexibility when cutting around pipes and other penetrations.

FRP Grating Load and Support Span

Moulded FRP grating support span depends on the grating thickness, model and applied load. The following values are for pedestrian-use moulded grating under the specified static loading conditions.

For typical walkways, the guidance is to use 25 mm grating on supports at up to 610 mm spacing and 38 mm grating on supports at up to 914 mm spacing.

The load values are based on L/100 (1%) deflection and are average values with a ±15% variation for static loads at room temperature. A design safety factor of 2.0 is used for creep under long-term load.

Span means the clear distance between the ledge faces. Leave at least 50 mm of ledge on each side. The grating size should be measured from wall to wall across the recess.

All MuiGrate gratings are for pedestrian traffic only in accordance with BS 4592. They are not intended for vehicle loads.

FRP Grating Surfaces, Resins and Colours

Surface Options

Moulded grating is supplied with a concave anti-slip top surface as standard. Gritted surfaces are available on request.

Covered grating can also be supplied with an FRP plate on top. Finish options include smooth, diamond, logo and gritted surfaces, depending on the configuration.

Pultruded grating is available with plain, gritted or 3 mm chequered plate surfaces.

Resin Options

• Orthophthalic polyester: General and construction use.
• Isophthalic polyester: General-purpose applications, including splash and spill areas.
• Vinyl ester: Highest chemical resistance within the available resin options.
• Fire-retardant: Available for the applicable grating configurations.

For chemical applications, provide the chemical involved, its strength or concentration and the operating temperature so the appropriate resin can be considered.

Colours

Standard colours include grey, yellow and green. Other colours are available on request.

FRP Grating Applications

Walkways and Access Platforms

FRP grating can be used for pedestrian walkways, access platforms, work platforms, ramps and other areas where a corrosion-resistant and anti-slip walking surface is required.

Sewage and Water Treatment Plants

FRP grating is suitable for walkways and platforms in sewage and water treatment environments where moisture and corrosive conditions can make conventional metal grating more demanding to maintain.

Semiconductor and Industrial Flooring

FRP grating can be used around industrial process areas where corrosion resistance and non-conductive flooring are important considerations.

Data Centre Cooling Tower Platforms

MuiGrate can be used for pedestrian access around cooling towers and related equipment. Its non-conductive and corrosion-resistant properties make FRP grating an option for access platforms in data centre environments.

Substations and Protective Grilles

FRP grating can be fabricated for non-conductive fencing, grilles and protective applications at substations and utility facilities.

Solar Walkways

FRP grating can provide lightweight, corrosion-resistant pedestrian walkways for maintenance access between solar panels on rooftops and solar installations.

Construction Site Safety Walkways

MuiGrate MG25(38/38) can be used as a temporary walkway surface on muddy construction sites. The open mesh allows water and mud to drain through while the anti-slip surface provides a more stable walking surface in wet conditions.

After use, the grating can be cleaned and relocated for use at another site.

Read the MUIGRATE MG25/38 muddy construction site case study.

FRP Manhole and Sump Covers

Mui Fatt supplies FRP manhole and sump covers for applications including drains, sumps and municipal infrastructure. Covers can be round or rectangular and can use either FRP grating or chequered plate, with mild steel or FRP frame options.

Standard sizes are available, and custom sizes can be produced for project and tender requirements. Council or company logos can also be incorporated where required.

Light-Duty FRP Septic Tank Manhole Covers

Light-duty septic tank manhole covers are supplied as a frame-and-cover set for foot-traffic applications. Available standard models include:

FRP Stair Treads

MuiGrate FRP stair treads are available in 228 mm, 305 mm or 367 mm widths and 762 mm or 914 mm lengths. Custom sizes can also be cut to suit the application.

Tread covers are 3 mm thick.

Site Safety Floor Sheets for Muddy Construction Sites

For temporary access across muddy construction areas, MG25(38/38) can be laid directly on mud without a separate base or fixings according to the supplied application guidance.

• Provides a stable pedestrian surface in wet and muddy conditions
• Open mesh allows water and mud to drain through
• Can be cleaned with a hose after use
• Can be moved and reused at another site
• Recommended model: MG25(38/38)

This makes the system useful where construction teams need a temporary walkway that can be installed and relocated as site conditions change.

SIRIM Certification and Standards

MuiGrate moulded and pultruded grating products are supported by SIRIM certification to the applicable BS 4592 standards.

Mui Fatt's quality management system is ISO 9001:2015 certified.

For load and span selection, the applicable BS 4592 requirements and the specific product and support arrangement should be considered. All gratings are for pedestrian traffic only and are not for vehicle loads.

FRP Grating Fire Performance

Fire-retardant versions of FRP grating are available.

One 38 mm grey moulded FRP grating sample passed ASTM E84 Class A testing. The test was performed by SGS on the tested sample, which recorded a Flame Spread Index of 15 and a Smoke Developed Index of 200.

The Class A result applies to the tested sample and should not be interpreted as a Class A rating for the entire MuiGrate range.

How to Specify FRP Grating for Your Project

To select the appropriate MuiGrate product, provide the application details and dimensions of the required opening or walkway.

• Application and intended use
• Required grating dimensions
• Clear support span
• Expected pedestrian or static loading requirements
• Surface requirement
• Chemical exposure, including chemical, concentration and temperature
• Preferred resin
• Colour requirement
• Frame, hinge, handle or logo requirements for covers

For recessed grating, measure the opening wall to wall and provide the support arrangement. Leave at least 50 mm of bearing ledge on each side.

Mui Fatt can cut moulded FRP grating to the required dimensions at the factory, including pipe penetrations and other shapes where required.

Frequently Asked Questions About FRP Gratings

What is FRP grating?

FRP grating is a fibreglass-reinforced plastic open-mesh grating used for pedestrian walkways, platforms, flooring, stairs, drains, trenches and other access applications. It provides corrosion resistance, non-conductive properties and an anti-slip walking surface.

What is the difference between moulded and pultruded FRP grating?

Moulded grating has a one-piece open-mesh construction with reinforcement running in both directions, while pultruded grating has load-bearing bars running in one direction. Moulded grating is generally preferred where two-way strength, impact resistance and easy cutting around penetrations are important. Pultruded grating is suited to applications where one-way span performance is the priority.

Is MuiGrate FRP grating SIRIM certified?

Yes. Moulded MuiGrate grating is covered by SIRIM licence PC013894 to BS 4592-6:2008, while the pultruded grating range is covered by SIRIM licence PM072601 to BS 4592 Part 4.

Can FRP grating be used for vehicles?

No. MuiGrate gratings are for pedestrian traffic only in accordance with BS 4592 and are not intended for vehicle loads.

Can MuiGrate grating be cut to custom sizes?

Yes. Moulded grating can be factory cut to the required width and length, with a cutting tolerance of ±5 mm. Pipe cut-outs and odd shapes are also available on request. Pieces smaller than 300 × 300 mm require consultation.

What support span can moulded FRP grating take?

The allowable support span depends on the grating model, thickness and load. For example, 25 mm models are specified up to 610 mm for 100 kg foot traffic, while MG50/38 is specified up to 1372 mm for the same load level. The applicable support arrangement should be checked before installation.

Which resin should I choose for chemical exposure?

The resin depends on the chemical, its concentration or strength and the operating temperature. MuiGrate options include orthophthalic polyester, isophthalic polyester and vinyl ester, with fire-retardant versions available.

Is FRP grating non-conductive?

Yes. FRP grating is non-conductive and can be used for applications such as substation grilles and data centre cooling tower access platforms where non-conductive access surfaces are required.

Can Mui Fatt make FRP manhole and sump covers to size?

Yes. FRP manhole and sump covers can be supplied in round or rectangular configurations, with grating or chequered plate and FRP or mild steel frame options. Custom sizes can be produced for project and tender requirements.

Can MuiGrate be used on muddy construction sites?

Yes. MG25(38/38) is recommended for temporary pedestrian walkways on muddy construction sites. The open mesh allows water and mud to drain through, and the grating can be cleaned and reused at another site.

What colours are available?

Standard colours include grey, yellow and green. Other colours are available on request.

How is FRP grating fixed?

MuiGrate grating can be fixed using 316 stainless steel clips. The appropriate fixing arrangement depends on the grating configuration and application.

Technical Expertise and Attribution

Technical specifications and product information on this page are attributed to Danny Ng Shin Lai, Director & Lead Composite Technical Specialist, and the Mui Fatt Technical Engineering Support Team.

Danny Ng studied Materials Science and Engineering at UC Berkeley and oversees technical design, composite fabrication standards, engineering design and technical compliance for FRP/GRP products.

For FRP grating selection, the technical team considers factors including the grating type, support span, loading requirements, chemical exposure, surface requirements and installation conditions.

Grating Type and Support Span

The choice between moulded and pultruded grating depends on how the grating will be supported and loaded. Moulded grating provides strength in both directions, while pultruded grating uses load-bearing bars running in one direction. Support span and loading should therefore be considered when selecting the grating thickness and configuration.

Resin Selection for Chemical Environments

Different environments require different resin options. MuiGrate is available with orthophthalic polyester, isophthalic polyester and vinyl ester resin options, as well as fire-retardant versions. For chemical applications, provide the chemical, concentration or strength and operating temperature so the appropriate resin can be considered.

Factory Cutting and Custom Fabrication

MuiGrate moulded grating can be factory cut to project dimensions, including pipe cut-outs and other shapes where required. FRP covers can also be supplied with frames, hinges, handles and logos according to the project requirements.

Project-Specific Requirements

For a grating or cover requirement, provide the opening dimensions, clear support span, intended application, loading requirements and environmental conditions. This information allows the appropriate product configuration to be considered before fabrication.

Request a Quote

Looking for FRP grating or a custom MuiGrate solution for your project? Contact Mui Fatt to discuss your required grating type, dimensions, support span, application and loading requirements.

Mui Fatt supplies moulded and pultruded FRP grating, including factory cut-to-size grating, trench covers, FRP manhole and sump covers, stair treads and temporary construction walkway sheets.

Working hours: Monday to Friday, 8:30am to 5:30pm

Send us your project's dimensions, application, support span and loading requirements to discuss the suitable MuiGrate configuration, surface and resin options, and custom fabrication requirements.

Call +603 3134 3888 for a Quote

Email Mui Fatt for an FRP Grating Quote