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If you've ever had to deal with rusted walkways, corroded drainage covers, or a steel platform that needs repainting every couple of years — you already know the problem. At AMROCK, we've spent years working with plant engineers, EPC contractors, and maintenance teams who face exactly this challenge. That's why FRP grating has become the material of choice across our customer base — not because it's trendy, but because it genuinely performs better over the long term in conditions where steel struggles.
We manufacture FRP molded grating and FRP pultruded grating panels for oil & gas, chemicals, water treatment, power generation, and marine industries. Our panels are built to handle real industrial conditions — acid splashes, salt spray, constant moisture, high foot traffic — and they keep performing for years or more without recoating, without repainting, and without replacement cycles that drain your maintenance budget.
What makes AMROCK different is that we don't just sell panels. We help you pick the right specification. Wrong mesh size, wrong resin, or wrong panel thickness can mean poor load performance or early failure. Our technical team works through the loading, span, and chemical exposure details before you order — so what arrives on site is what actually works.
The full name is Fibre Reinforced Plastic grating — sometimes called GRP grating or fibreglass grating depending on where you are in the world. It's a structural grid panel made by combining continuous glass fibre rovings with a thermosetting resin — usually polyester, vinyl ester, or phenolic. The fibres and resin combine in a mould or by pultrusion, producing a panel that is rigid, lightweight, and resistant to corrosion not just by coating but by its very composition.
The key difference from steel is that FRP doesn't rely on a coating for protection. The glass-resin matrix is chemically inert — nothing to rust, nothing to pit, nothing to peel. That's why in environments where steel grating lasts 3–5 years before replacement, fibreglass grating from AMROCK regularly reaches more than 10-15 years of service with nothing more than occasional cleaning.
Our most widely supplied product. In molded FRP grating, glass fibre rovings are woven in alternating directions inside a mould and saturated with resin, then cured under heat and pressure. The woven structure gives the panel equal strength in both directions — so it handles loads from any angle equally well. It's the go-to for platform flooring, stair treads, trench covers, and drainage grating. Standard Grating Sizes are provided in below table
| Model No. | Height (mm) | Mesh (mm) | Thickness (up-down) | Open Area (%) | Available Panel Size (mm) |
|---|---|---|---|---|---|
| AMSM 12X (50×50) | 12 | 50×50 | 6–5 mm | 82% | 1007×4010 |
| AMRM 25X (25×100) | 25 | 25×100 | 6–5 mm | 68% | 1220×3660 |
| AMSM 25X (38×38) | 25 | 38×38 | 7–5 mm | 68% | 1220×3660 |
| AMSM 25X (40×40) | 25 | 40×40 | 6–5 mm | 68% | 1007×4127 |
| AMSM 30X (38×38) | 30 | 38×38 | 7–5 mm | 68% | 1220×3660 |
| AMSM 30X (40×40) | 30 | 40×40 | 7–5 mm | 68% | 1007×4127 |
| AMMM 38X (19×19) | 38 | 19×19 (38×38) | 7–5 mm | 40% | 1220×4000 |
| AMSM 38X (38×38) | 38 | 38×38 | 7–5 mm | 68% | 1220×3660 |
| AMSM 38X (40×40) | 38 | 40×40 | 7–5 mm | 68% | 1007×4127 |
| AMSM 50X (50×50) | 50 | 50×50 | 8–5 mm | 71% | 1225×4070 |
| AMSM 45X (30×30) | 45 | 30×30 | 7–9 mm | 62% | 1027×2047 |
Pultruded FRP grating is made differently — glass fibres are pulled through a resin bath and a heated die to produce I-bars ssembled into panels. The result is significantly higher load capacity in one direction. If you have a long-span application — a cable trench cover, a vehicle crossing, a mezzanine with supports far apart — pultruded grating is usually the answer. Standard Grating Sizes are provided in below table
| Model No. | Height (mm) | Top Width (mm) | C/C Spacing (mm) | Clear Gap (mm) | Open Area (%) |
|---|---|---|---|---|---|
| AMI 1040 | 25 | 15 | 25 | 10 | 40% |
| AMI 1050 | 25 | 15 | 30 | 15 | 50% |
| AMI 1060 | 25 | 15 | 38 | 23 | 60% |
| AMI 1070 | 25 | 15 | 50 | 35 | 70% |
| AMI 1080 | 25 | 15 | 75 | 60 | 80% |
| AMI 1540 | 38 | 15 | 25 | 10 | 40% |
| AMI 1550 | 38 | 15 | 30 | 15 | 50% |
| AMI 1560 | 38 | 15 | 38 | 23 | 60% |
| AMI 1570 | 38 | 15 | 50 | 35 | 70% |
| AIMI 1580 | 38 | 15 | 75 | 60 | 80% |
Select the right resin for your chemical environment — wrong resin means premature failure.
Industrial Grade Corrosion Resistance and Fire Retardant.
Industrial Grade Corrosion Resistance in Acidic Environment.
Non Fire RetardantSuperior Corrosion Resistance & Fire Retardant.
We've had customers approach us after spending significant budget on steel grating that corroded within a very short span at a coastal plant. The economics of corrosion resistant FRP grating look very different when you factor in repainting, galvanizing, partial replacement, and the cost of shutting down a platform for maintenance. Here's what FRP actually does better:
The glass-resin matrix is inert to H₂S, chlorine, seawater, acids, and alkalis — no coating required, ever.
Roughly 75% lighter than equivalent steel — less structural load, easier handling, faster installation on site.
Non-conductive — safe for switchgear rooms, transformer areas, and live-line environments.
Relevant for MRI suites, naval vessels, and instrument platforms where magnetic interference matters.
Gritted top surface maintains grip when wet, oily, or chemically contaminated — without anti-slip tape or nosings.
Wash down with water. No painting schedule, no descaling, no hot work permits for upkeep.
Our customers span a wide range of sectors. The common thread is any environment where steel corrodes or conductivity is a safety concern.
This is where many projects go wrong — picking a panel based on price alone without verifying the specification. Here are the four decisions that actually matter.
For spans under 600 mm with pedestrian-only loading, standard light weight molded grating works well. For longer spans or equipment loads, choose from higher sizes of molded grating or pultruded gratings. AMROCK provides load tables and deflection calculations free of charge for every project enquiry.
In mild conditions, orthophthalic or isophthalic polyester resin is sufficient. Anywhere there's strong acid, alkali, chlorine, or solvents, go straight to vinyl ester resin — the cost difference per panel is small compared to the risk of premature failure.
Standard 38×38 mm mesh works for most walkways. For overhead platforms above work areas, specify mini mesh FRP grating at 19×19 mm to comply with falling objects safety requirements.
One of the practical advantages of FRP grating installation is that it requires no hot work — no welding, no grinding sparks, no fire watch, no hot work permits. Panels are fixed to support steelwork using FRP or stainless steel grating clips that lock panels in place without any site welding. If panels need cutting to size, a diamond-tipped circular saw or angle grinder handles FRP cleanly. Seal cut edges with compatible resin to maintain full corrosion resistance at the cut face.
For ongoing maintenance, there's very little to do. Periodic washing with water and mild detergent keeps the surface clean and the anti-slip grit effective. Unlike steel, there's no descaling schedule, no repainting cycle, and no re-galvanizing — which is often a larger cost driver than the original material purchase.
Highest strength, lowest initial cost - but rusts in corrosive or wet environments. Lifetime maintenance cost typically exceeds purchase cost within 10 years in harsh conditions
Lighter than steel, better corrosion resistance in mild conditions, electrically conductive. Not suitable for strong acid or alkali environments
Lightest of the three, fully corrosion resistant, non-conductive, lowest maintenance cost. Higher upfront cost than mild steel but the lowest 20-year lifecycle cost in aggressive environments
Certified manufacturing facility with documented quality management processes.
Custom panel sizes, mesh configurations, and colour options available.
Load tables and span calculations provided free of charge for every project enquiry.
Pan-India supply to all major corporates & zones. Exports to more than 14 countries across the globe.
Tell us about your project requirements, and our team will provide a customized quotation with the best solution for your application..