Manhole covers
Molded grating or chequered plate covers, set in a mild steel or FRP frame.
For: Town councils and developers
MuiGrate · FRP gratings & covers
Malaysia’s own
molded FRP grating.
Made in Port Klang. One-piece panels that never rust, cut to the size you need before they leave the factory.
Made in
Port Klang, Selangor
Certified
SIRIM · ISO 9001:2015
Cut
To your size, ±5 mm
For pedestrian traffic only (BS 4592). Not for vehicle loads.
MuiGrate MG25(38/38), gritted top
Scan for this deck
The opening story
The first molded FRP grating made in Malaysia.
Most molded grating sold here is shipped in from overseas. Ours is made in Port Klang. That means local stock, local cutting, and a team you can call.
Made here
Port Klang, Selangor
Molded in our own factory, not shipped in.
Certified here
SIRIM licence PC013894
Moulded open mesh gratings, BS 4592-6:2008.
Cut here
To your sizes, before it ships
No full panels to cut on site.
How it’s made
One piece. No welds, no joints, nothing to rust.
Continuous fiberglass strands are woven through thermosetting resin in a mould, so each panel comes out as one solid grid.
65% resin
The resin carries the corrosion resistance, so it lasts for years with no maintenance.
Much lighter than metal
A full 4 × 12 ft MG25(38/38) panel weighs 55 kg.
Grip built in
An anti-slip top surface. Grit top on request.
Cut to size · no wastage
Buy the size you need. Not the full panel.
In the market, you buy a full 4 × 12 ft panel and cut it on site. You pay for the offcut, and your crew loses time to cutting. Send us your sizes. We cut and quote to size.
Your piece
0 m²
0 kg
Fits one panel
0
pieces like it
Cut by us
±5 mm
length and width
Usual way
With MuiGrate
Small-piece rate: Pieces below 0.5 m² are charged at our small-piece rate. Ask us for a quote.
Weight from the catalogue kg/m² for the series. The piece is drawn to scale on that series’ full standard panel. Pipe cut-outs and odd shapes on request.
| Series | Height | Mesh (mm) | Full panel (mm) | Open area | kg/m² |
|---|---|---|---|---|---|
| MG25(38/38) | 25 mm | 38 × 38 | 1220 × 3660 | 69% | 12.32 |
| MG30(38/38) | 30 mm | 38 × 38 | 1220 × 3660 | 69% | 15.00 |
| MG38(38/38) | 38 mm | 38 × 38 | 1220 × 3660 · 1527 × 4000 | 69% | 20.16 |
| MG50(38/38) | 50 mm | 38 × 38 | 1220 × 3660 | 69% | 24.63 |
| MG25(20/20) | 25 mm | 20 × 20 top / 40 × 40 bottom | 1220 × 3660 | 38% | 16.35 |
| MG38(20/20) | 38 mm | 20 × 20 top / 40 × 40 bottom | 1007 × 4047 | 42% | 21.84 |
| MG25(25/100) | 25 mm | 25 × 100 | 1207 × 4107 | 67% | 12.5 |
Any width and length up to the full panel, cut at the factory to ±5 mm. Below 300 × 300 mm, please consult us. Small-piece rate: Pieces below 0.5 m² are charged at our small-piece rate. Ask us for a quote. All MuiGrate gratings are SIRIM certified.
The range · MG25 to MG50
Seven panels. Square, minimesh or long mesh.
Heights from 25 to 50 mm. All MuiGrate gratings are SIRIM certified. Minimesh has a 20 × 20 mm top mesh over a 40 × 40 mm lower mesh.
Square mesh
| Series | Height | Mesh (mm) | Standard panel (mm) | Open area | kg/panel | kg/m² |
|---|---|---|---|---|---|---|
| MG25(38/38) | 25 mm | 38 × 38 | 1220 × 3660 | 69% | 55.0 | 12.32 |
| MG30(38/38) | 30 mm | 38 × 38 | 1220 × 3660 | 69% | 67.0 | 15.00 |
| MG38(38/38) | 38 mm | 38 × 38 | 1220 × 3660 1527 × 4000 | 69% | 90.0 | 20.16 |
| MG50(38/38) | 50 mm | 38 × 38 | 1220 × 3660 | 69% | 110.0 | 24.63 |
Swipe to see more →
Minimesh
| Series | Height | Mesh (mm) | Standard panel (mm) | Open area | kg/panel | kg/m² |
|---|---|---|---|---|---|---|
| MG25(20/20) | 25 mm | 20 × 20 top / 40 × 40 bottom | 1220 × 3660 | 38% | 73.0 | 16.35 |
| MG38(20/20) | 38 mm | 20 × 20 top / 40 × 40 bottom | 1007 × 4047 | 42% | 89.0 | 21.84 |
Swipe to see more →
Long mesh
| Series | Height | Mesh (mm) | Standard panel (mm) | Open area | kg/panel | kg/m² |
|---|---|---|---|---|---|---|
| MG25(25/100) | 25 mm | 25 × 100 | 1207 × 4107 | 67% | 62.0 | 12.5 |
Swipe to see more →
Tolerance per full panel ±5 mm on length and width, ±1.5 mm on thickness. Colours: grey, yellow, green and other options.
Choose by span · simple rules of thumb
Measure the gap between supports. Pick the grating.
Load
| Grating model | Height | 100 kg foot traffic | 500 kg | 1000 kg | Maximum load |
|---|---|---|---|---|---|
| MG25/38 MG25/100 MG25/20 | 25 mm | Max support span: up to 610 mm | Max support span: up to 457 mm | Not recommended for this thickness. | Max UDL: 1,930 kg/m² Max CL: 286 kg/m at 305 mm span |
| MG30/38 | 30 mm | Max support span: up to 914 mm | Max support span: up to 610 mm | Max support span: up to 457 mm | Max UDL: 1,110 kg/m² Max CL: 126 kg/m at 610 mm span |
| MG38/38 MG38/20 | 38 mm | Max support span: up to 1219 mm | Max support span: up to 914 mm | Max support span: up to 610 mm | Max UDL: 2,765 kg/m² Max CL: 286 kg/m at 457 mm span |
| MG50/38 | 50 mm | Max support span: up to 1372 mm | Max support span: up to 1219 mm | Max support span: up to 914 mm | Max UDL: 3,917 kg/m² Max CL: 448 kg/m at 610 mm span |
Swipe to see more →
The 100 kg rule · walkways
For basic walkways, match the thickness to the span. Supports 2 ft (610 mm) apart: use 25 mm grating. Supports 3 ft (914 mm) apart: use 38 mm grating.
The support rule
Placing equipment or loaded pallets (500 to 1000 kg) on the floor? Never let the support gap go over 2 to 3 ft (610 to 914 mm), whichever thickness you choose.
Maximum loads already include a safety factor of 2.0. SIRIM certification covers the spans listed on our licence schedule. Wider spans follow our own engineering tables. Max UDL is per m², Max CL per metre. For pedestrian traffic only (BS 4592). Not for vehicle loads.
Molded grating performance charts
The full load tables. For your engineer.
MG25(38/38)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 305 | ΔU | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 38.6 |
| ΔC | 0.53 | 0.81 | 1.62 | 3.16 | 4.5 | 5.72 | |
| 457 | ΔU | 0.21 | 0.38 | 0.56 | 0.75 | 1.51 | 29.4 |
| ΔC | 1.83 | 2.76 | 5.42 | 10.8 | 2.52 | ||
| 610 | ΔU | 0.58 | 1.17 | 1.75 | 2.32 | 4.68 | 12.6 |
| ΔC | 4.27 | 6.38 | 12.72 | 1.44 | |||
| 914 | ΔU | 3.03 | 6.04 | 12.1 | 3.62 | ||
| ΔC | 0.0 | 0.56 |
MG30(38/38)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 457 | ΔU | 0.01 | 0.02 | 0.03 | 0.05 | 0.9 | 50.18 |
| ΔC | 1.09 | 1.67 | 3.21 | 6.36 | 3.9 | 4.30 | |
| 610 | ΔU | 0.36 | 0.69 | 1.02 | 1.35 | 2.71 | 22.03 |
| ΔC | 2.45 | 3.68 | 7.22 | 2.52 | |||
| 914 | ΔU | 1.58 | 3.15 | 4.78 | 6.27 | 12.69 | 7.00 |
| ΔC | 7.62 | 1.20 | |||||
| 1219 | ΔU | 2.85 | 5.67 | 8.48 | 11.3 | 5.16 | |
| ΔC | 0.0 | 0.74 |
MG38(38/38)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 457 | ΔU | 0.00 | 0.00 | 0.00 | 0.00 | 0.0 | 55.30 |
| ΔC | 0.53 | 0.81 | 1.62 | 3.16 | 4.5 | 5.72 | |
| 610 | ΔU | 0.18 | 0.37 | 0.54 | 0.72 | 1.45 | 40.22 |
| ΔC | 1.35 | 2.03 | 3.92 | 7.86 | 11.93 | 4.60 | |
| 914 | ΔU | 0.93 | 1.84 | 2.77 | 3.7 | 7.37 | 11.90 |
| ΔC | 4.45 | 6.7 | 13.34 | 2.04 | |||
| 1219 | ΔU | 2.85 | 5.67 | 8.48 | 11.3 | 5.16 | |
| ΔC | 10.30 | 1.18 |
MG50(38/38)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 610 | ΔU | 0.1 | 0.2 | 0.3 | 0.4 | 0.8 | 78.34 |
| ΔC | 0.71 | 1.05 | 2.14 | 4.16 | 6.13 | 8.96 | |
| 914 | ΔU | 0.49 | 0.91 | 1.35 | 1.82 | 3.61 | 24.39 |
| ΔC | 2.19 | 3.3 | 6.56 | 13.1 | 4.18 | ||
| 1219 | ΔU | 1.41 | 2.79 | 4.19 | 5.56 | 11.21 | 10.50 |
| ΔC | 5.09 | 7.62 | 15.24 | 2.40 | |||
| 1372 | ΔU | 2.28 | 4.52 | 6.73 | 9.01 | 7.31 | |
| ΔC | 7.32 | 10.98 | 1.88 |
MG25(20/20)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 305 | ΔU | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 45.6 |
| ΔC | 0.46 | 0.65 | 1.34 | 2.62 | 3.9 | 6.9 | |
| 457 | ΔU | 0.14 | 0.31 | 0.49 | 0.61 | 1.21 | 37.11 |
| ΔC | 1.47 | 2.26 | 4.4 | 8.53 | 3.18 | ||
| 610 | ΔU | 0.47 | 0.97 | 1.39 | 1.87 | 3.68 | 16.09 |
| ΔC | 3.35 | 5.02 | 9.89 | 1.84 | |||
| 914 | ΔU | 2.36 | 4.71 | 7.06 | 9.38 | 4.67 | |
| ΔC | 0.0 | 0.82 |
MG38(20/20)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 457 | ΔU | 0.00 | 0.00 | 0.00 | 0.00 | 0.0 | 63.50 |
| ΔC | 0.51 | 0.75 | 1.48 | 2.91 | 4.42 | 9.36 | |
| 610 | ΔU | 0.15 | 0.31 | 0.45 | 0.61 | 1.22 | 48.96 |
| ΔC | 0.77 | 1.53 | 2.28 | 3.02 | 6.01 | 14.59 | |
| 914 | ΔU | 1.02 | 1.58 | 3.2 | 6.5 | 9.71 | 5.60 |
| ΔC | 3.63 | 5.58 | 10.8 | 2.50 | |||
| 1219 | ΔU | 2.46 | 4.89 | 7.35 | 9.78 | 5.95 | |
| ΔC | 8.98 | 13.38 | 1.36 |
MG25(25/100)
| Span (mm) | UDL kN/m² | 1.2 | 2.4 | 3.6 | 4.8 | 9.7 | Maximum load |
|---|---|---|---|---|---|---|---|
| CL kN/m | 1.0 | 1.5 | 3.0 | 6.0 | 9.0 | ||
| 305 | ΔU | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 56.2 |
| ΔC | 0.34 | 0.48 | 0.92 | 1.81 | 2.72 | 10.16 | |
| 457 | ΔU | 0.12 | 0.24 | 0.35 | 0.46 | 0.93 | 47.85 |
| ΔC | 1.21 | 1.69 | 3.37 | 6.71 | 10.07 | 4.1 | |
| 610 | ΔU | 0.4 | 0.78 | 1.18 | 1.52 | 3.05 | 19.93 |
| ΔC | 2.7 | 4.06 | 8.08 | 2.28 | |||
| 914 | ΔU | 1.86 | 3.7 | 5.57 | 7.4 | 5.95 | |
| ΔC | 8.92 | 1.02 |
ΔU: deflection under uniform distributed load (UDL), mm. ΔC: deflection under concentrated load (CL), mm. Maximum load: UDL in kN/m² (upper row), CL in kN/m (lower row).
Read every chart with these
- Loads at L/100 (1%) deflection.
- Average values, tolerance ±15%.
- Static load at room temperature only. Long-term loads add deflection through creep. For design, use a safety factor of 2.0.
- Values are calculated from engineering models. Third-party deflection test reports to BS 4592-6:2008 are available on request, and physical load testing can be arranged.
Concrete recess
Most projects in Malaysia set molded grating into a concrete recess. The span in these tables is the clear, open distance between the ledge faces, not the length of the grating. Always leave a minimum ledge of 50 mm on each side.
Span too wide?
You don’t always need a thicker grating. An extra steel crossbeam or concrete support underneath halves the span.
Resin and surface
Pick the resin by the job. Pick the top by the traffic.
Orthophthalic polyester
Durable and long lasting, to replace rusting steel. For construction and commercial use where less chemical resistance is needed.
Isophthalic polyester
A middle level of resistance. The right choice for splash and spill contact, and a very good general-purpose resin.
Vinyl ester
The most chemical resistance, for the hardest areas: a broad range of acids and caustics.
Fire rated
A fire rated version of each resin, for areas that need a high fire rating.
Working with chemicals? Send us the chemical, the strength and the temperature. We check the right resin before we quote. This is a general guide, not a chemical resistance chart.
Covered grating
An FRP plate laminated on top of the grating, with a gel coat for UV protection. Finishes: smooth, diamond, logo-embedded or gritted (silica sand or quartz).
Stair treads
Widths 228, 305 and 367 mm, lengths 762 and 914 mm, or cut to size.
Tread covers
Fiberglass tread covers, 3 mm thick. Light, non-conductive and easy to install.
Fixing and measuring
Measure the recess. Clip it down.
How to measure a drain recess
Two clips, for molded or pultruded grating. Both attach the grating to its supports. The Disc clip is for moderate loads.
Illustration, not to scale.
Measuring a recess: the grating size is the recess, wall to wall. The span for the load tables is the drain opening, ledge face to ledge face. Leave at least 50 mm of ledge on each side.
New application · construction sites
A firm path through a wet site. Then reuse it on the next one.
Sites served by one set
Grip
Anti-slip top surface. Grit top on request.
Light
MG25(38/38): 55 kg for a full 4 × 12 ft panel.
No rust
FRP doesn’t corrode in mud or rain. Hose it down and go.
For
Main contractors and site safety officers.
For people on foot. For pedestrian traffic only (BS 4592). Not for vehicle loads.
- Lay it on the mud. Set the sheets straight onto the ground, end to end. No base, no fixings. Your crew has a firm path in minutes.
- Work through the rain. Water drains through the open mesh, and the anti-slip top grips under boots. The site keeps moving after a downpour.
- Lift and hose down. When the job is done, lift the sheets and hose them clean. FRP doesn’t rust, so nothing is lost to the mud.
- Lay it on the next site. Take the same sheets to the next project. One set serves site after site.
Where molded grating goes
From the sewage plant to the server room.
IllustrationSTP walkways
Wet and corrosive, every day. FRP doesn’t rust, so the walkway lasts.
For: STP operators
IllustrationSemiconductor factory flooring
Non-conductive and corrosion resistant, around process lines and chemicals.
For: Plant and semiconductor engineers
IllustrationData centre and cooling tower platforms
Rust-free, non-conductive walkways around cooling towers and gensets.
For: Data centre engineers
Substation fencing and protective grilles
Our fiberglass (FRP) gratings are non-conductive. Custom sizes.
For: Utility contractors
Rooftop solar walkways
Maintenance walkways between solar panels. Light and rust-free.
For: Solar installers and building owners
For pedestrian traffic only (BS 4592). Not for vehicle loads.
MuiGrate pultruded grating & chequered plate
Built for trenches and drains. Framed, hinged, ready to drop in.
Height (C)
SIRIM certified
Licence PM072601, BS 4592 Part 4:1992.
- Frame
- Mild steel, hot-dip galvanized, FRP, or grating only
- Hinges
- Aluminium, mild steel or stainless steel
- Heights
- 25, 38 and 50 mm
- Sizes
- Up to 4 ft wide and 4 m long. Wider openings use a double-leaf design. Longer than 4 m: call us.
- Surface
- Normal (plain), gritted, or 3 mm chequered plate
- Resin
- Isophthalic, vinyl ester or fire resistant
- Colour
- Grey, yellow or green
- Add-ons
- Embossed logo, handles
Chemical area? Send us your chemical details. We check the right resin before we quote.
Buyer’s guide · molded vs pultruded
Two good gratings. Here’s when to pick each.
Molded grating is one piece, strong both ways. Pultruded grating is bars and cross-bars, strongest along the bars.
Your job needs
Pick what your job needs, and the guide points to the grating.
Molded grating
Pultruded grating
Chemical resistance
ExcellentMolded
Good
Two-way strength
ExcellentMolded
Not recommended
One-way strength
Very good
ExcellentPultruded
Impact resistance
ExcellentMolded
Average
Open area
38–69%
50–60%
Panel sizes
Excellent
Excellent
Pipe penetrations
ExcellentMolded
Average
Safety
Excellent
Excellent
From the MuiGrate catalogue comparison. Open area from our size tables: molded 38–69%, pultruded 50–60%. Pultruded bars carry 65% glass to 35% resin. Molded grating carries 65% resin, which is where its corrosion resistance comes from. These are estimated values and may change with the actual formulation.
FRP manhole & sump covers · for town and municipal councils
No scrap value. No rust. Odours kept down.
Steel covers get stolen and rust out. FRP covers have nothing worth stealing, and they stay put.
Built for the street
- Isophthalic polyester resin
- UV-resistant gelcoat
- Gritted anti-slip top
- Corrosion resistant
- Helps keep odours down
Range
Round or rectangular. Chequered plate or grating covers, with a mild steel or FRP frame. Standard sizes, or made to size for tenders.
We can put your council’s or company’s own logo on the cover.
Drains with a concrete recess
Grating without a frame: gritted for walkways, chequered plate to hide the drain. Where the drain needs access, keep pieces to 1.5 m so they lift out easily.
| Light duty septic tank cover | Shape | Size | Inch |
|---|---|---|---|
| FRP MC/D10 | Round | Ø 254 mm | 10" |
| FRP MC/D20 | Round | Ø 508 mm | 20" |
| FRP MC/D24 | Round | Ø 610 mm | 24" |
| FRP MC/15x20 | Rectangular | 381 × 508 mm | 15" x 20" |
| FRP MC/18x24 | Rectangular | 457 × 610 mm | 18" x 24" |
Swipe to see more →
For pedestrian traffic only (BS 4592). Not for vehicle loads.
Selection helper
Tell us the job. We’ll point to the product.
1 · What is it for?
2 · Size (mm)
3 · Load and support span
4 · Chemicals present?
| If the job is… | Start with |
|---|---|
| Walkway or platform | Molded grating cut to size. Height from the rules of thumb table. |
| Drain with a concrete recess | Molded grating cut to the recess, no frame. Gritted or chequered plate. |
| Trench needing a framed, hinged cover | Pultruded grating with frame (molded grating also comes with a mild steel frame). Double-leaf above 4 ft wide. Longer than 4 m: call us. |
| Drain without a recess | Send us a photo and the sizes. |
| Manhole or sump | FRP manhole or sump cover, round or rectangular. |
| Septic tank access | Light duty septic tank cover, five standard sizes. |
| Wet construction site | Site safety floor sheets, MG25(38/38). |
| Fence or grille | Molded grating fence or grille, non-conductive. |
Next step
Send us the job and the sizes.
We’ll send the cut list.
Working with chemicals? Tell us the chemical, the strength and the temperature. We check the right resin before we quote. Mon–Fri 8am–5pm, Sat 8am–1pm.
All MuiGrate gratings are SIRIM certified.
| Product line | Body | Licence / Ref. | Standard |
|---|---|---|---|
| Molded gratingY.T. Fibreglass Industries Sdn Bhd | SIRIM | PC013894 | BS 4592-6:2008 |
| Pultruded gratingY.T. Fibreglass Industries Sdn Bhd | SIRIM | PM072601 | BS 4592 Part 4:1992 |
| Quality management, all productsMui Fatt Marketing Sdn Bhd · Y.T. Fibreglass Industries Sdn Bhd | Amtivo | 265501 | ISO 9001:2015 |
Swipe to see more →
Scan to share this deck