FRP / GRP
Gratings Manufacturer · Supplier · Exporter
Moulded and pultruded FRP/GRP gratings in isophthalic polyester, vinyl ester, epoxy, and phenolic resin systems. Anti-slip, fire retardant, lightweight, and chemically resistant. For walkways, platforms, trenches, stair treads, and industrial flooring. ASTM, ISO, DIN, BS EN standards. Serving chemical, oil & gas, water, marine, and mining sectors globally.
FRP/GRP Grating — Full Range
All gratings manufactured under documented quality control with raw material batch records, resin content verification, and load test certificates. Third-party inspection (SGS, TÜV, BV) available on request.
Continuous bi-directional E-glass roving laid in a mould and impregnated with liquid resin under controlled conditions. The simultaneous cure of load bars and cross bars creates a monolithic, one-piece panel with equal strength in both directions. Concave gritted anti-slip surface as standard.
- Mesh Sizes25×25 mm · 38×38 mm · 50×50 mm · 38×38 mm (mini-mesh)
- Panel SizeStandard: 1220×3660 mm (4′×12′) · 1000×2000 mm (metric) · Custom on request
- Depths (mm)25 mm · 38 mm · 50 mm · 75 mm (deep section for heavy loads)
- Bar Width~9 mm (standard) · Solid top surface available
- Open Area~70–75% (25×25) · ~68–72% (38×38) · ~65–70% (50×50)
- Resin SystemsIsophthalic · Vinyl Ester · Epoxy · Orthophthalic · Phenolic FR
- FibreE-glass (standard) · ECR-glass (acid/alkali service)
- Anti-Slip SurfaceConcave gritted top surface (standard) · Grit-top overlay · Plain smooth
- ColoursYellow (standard) · Grey · Green · Red · Blue · Black
- Load (25mm depth)~1.5 kN/m² (250mm span) · ~2.5 kN/m² (200mm span)
- Flexural Strength≥150 MPa (longitudinal) per ASTM D790
- Weight (38×38/38mm)~14–16 kg/m² (vs. 48 kg/m² steel open bar grating)
- Fire RatingClass 1 / Class I (ASTM E84 flame spread ≤25) — VE & FR grades
- Density~1.8 g/cm³ (¼ weight of steel at same load capacity)
Solid top moulded grating with a continuous flat upper surface. Prevents dropped tools from passing through, prevents heel-catch hazard, and allows easy cleaning. Available with meniscus anti-slip surface or grit overlay. Micro-mesh (12×25 mm) provides pedestrian comfort and high safety for narrow-heel footwear.
- TypesSolid top panel · Micro-mesh (12×25 mm) · Mini-mesh (13×38 mm) · Covered trench grating
- Panel Size1220×3660 mm · 1000×2000 mm · custom
- Depths25 mm · 38 mm · 50 mm
- Anti-SlipMeniscus moulded surface (integral) · Grit overlay · Silica grit bonded
- Open Area0% (solid top) · ~35% (micro-mesh) · ~40% (mini-mesh)
- Special UseHeel-safe (offshore, hospitals, food processing) · Chemical containment bunds · Vehicle trafficked areas
- Resin SystemsISO · VE · Phenolic (FR) · Ortho
- ColourYellow · Grey · Green · Custom RAL
Moulded FRP Grating — Load & Deflection Data
Safe working load (SWL) at maximum span for pedestrian and light industrial duty. Deflection limit = span/200. Values for isophthalic resin; multiply by 0.95 for vinyl ester (VE slightly stiffer). Load values are for uniformly distributed load (UDL). For concentrated (point) loads, consult engineering datasheet.
| Depth (mm) | Mesh Size (mm) | Span 300mm SWL | Span 600mm SWL | Span 900mm SWL | Span 1200mm SWL | Weight (kg/m²) | Open Area |
|---|---|---|---|---|---|---|---|
| 25 mm | 25×25 | 6.0 kN/m² | 2.5 kN/m² | 1.2 kN/m² | 0.7 kN/m² | 13.0 | ~72% |
| 25 mm | 38×38 | 6.5 kN/m² | 2.8 kN/m² | 1.4 kN/m² | 0.8 kN/m² | 12.5 | ~70% |
| 38 mm | 25×25 | 18.0 kN/m² | 7.5 kN/m² | 3.5 kN/m² | 2.0 kN/m² | 16.5 | ~72% |
| 38 mm | 38×38 | 19.0 kN/m² | 8.0 kN/m² | 3.8 kN/m² | 2.2 kN/m² | 15.8 | ~70% |
| 38 mm | 50×50 | 18.5 kN/m² | 7.8 kN/m² | 3.6 kN/m² | 2.0 kN/m² | 14.5 | ~68% |
| 50 mm | 25×25 | 34.0 kN/m² | 14.0 kN/m² | 6.5 kN/m² | 3.8 kN/m² | 20.0 | ~72% |
| 50 mm | 38×38 | 36.0 kN/m² | 15.0 kN/m² | 7.0 kN/m² | 4.0 kN/m² | 19.0 | ~70% |
| 75 mm | 38×38 | 80.0 kN/m² | 33.0 kN/m² | 15.0 kN/m² | 8.5 kN/m² | 26.0 | ~68% |
SWL values based on deflection limit of L/200 with factor of safety ≥ 4 on ultimate failure load. Moulded gratings have equal strength in both directions. For vehicle loading (forklifts, vehicles), contact engineering department. All panels must be properly supported on all four sides or per manufacturer's span recommendations.
Pultruded load bars interlocked with pultruded cross rods to form a unidirectional structural grating panel. Load bars carry load in one primary direction — higher load capacity than moulded gratings at equivalent depth. Preferred where unidirectional loading and long spans are required.
- Load Bar ProfilesI-bar · T-bar · Rectangular (solid) · Bearing bar
- Load Bar Depths25 mm · 30 mm · 38 mm · 50 mm · 65 mm · 75 mm · 100 mm
- Load Bar Spacing30 mm c/c · 38 mm c/c · 50 mm c/c (pitch) — select per load/span
- Cross Rod Dia.8 mm · 10 mm · 12 mm (pultruded rod, locked into load bar)
- Cross Rod Spacing50 mm · 100 mm · 150 mm c/c
- Panel SizeStandard: 1220×3660 mm (4′×12′) · 1000×2000 mm · custom cut
- Resin SystemsIsophthalic · Vinyl Ester · Epoxy (structural duty) · Phenolic (fire rated)
- Fibre Content55–70% by weight (highest strength — unidirectional)
- Tensile Str. (axial)≥ 240 MPa (I-bar longitudinal) per ASTM D638
- Flexural Modulus17–22 GPa (longitudinal) — stiffer than moulded
- Anti-SlipGrit top bonded (epoxy sand) · Meniscus moulded · Concave gritted
- Open Area~78–85% (higher than moulded — better drainage)
- Max. SpanUp to 3600 mm (100mm I-bar at design load) — exceeds moulded capability
- Fire RatingClass I (ASTM E84) · Class B1 (DIN 4102) for FR grades
Purpose-designed stair tread panels with integrated nosing using pultruded or moulded GRP. High-visibility yellow nosing stripe standard. Certified slip resistance (R11 / R13) per DIN 51130. Available in open-mesh and solid-top variants.
- TypesOpen grating tread · Solid top tread · Cover tread with nosing · Retrofit tread (bonded to existing stair)
- Standard Widths600 mm · 800 mm · 1000 mm · 1200 mm · Custom
- Standard Depths200 mm · 250 mm · 300 mm (tread depth)
- NosingYellow GRP nosing strip bonded to leading edge (standard) · Black · Custom RAL
- Anti-Slip ClassR11 (moderate) · R13 (high — chemical / offshore) per DIN 51130
- Load Rating≥ 4.0 kN/m² UDL · 3.0 kN concentrated (heel load) — BS EN ISO 14122-3
- Resin SystemsISO · VE · Phenolic (FR for marine/offshore)
- ColourYellow (standard) · Grey · Custom. Yellow nosing compulsory per OSHA/EN.
Pultruded FRP Grating — I-Bar Load & Span Data
Load values for vinyl ester I-bar grating, 30 mm pitch load bars, 100 mm cross rod spacing. Pultruded gratings carry load primarily in the bar direction — span perpendicular to bars must be minimised or separately supported. Deflection limit = L/200.
| Bar Depth (mm) | Bar Pitch (mm) | Span 600mm SWL | Span 900mm SWL | Span 1200mm SWL | Span 1500mm SWL | Weight (kg/m²) | Max. Span (L/200) |
|---|---|---|---|---|---|---|---|
| 25 mm I-bar | 30 | 6.5 kN/m² | 3.0 kN/m² | 1.8 kN/m² | 1.2 kN/m² | 15.5 | 1000 mm |
| 38 mm I-bar | 30 | 15.0 kN/m² | 7.0 kN/m² | 4.0 kN/m² | 2.6 kN/m² | 18.0 | 1500 mm |
| 50 mm I-bar | 30 | 28.0 kN/m² | 13.0 kN/m² | 7.5 kN/m² | 5.0 kN/m² | 22.0 | 2000 mm |
| 50 mm I-bar | 38 | 22.0 kN/m² | 10.0 kN/m² | 6.0 kN/m² | 4.0 kN/m² | 18.5 | 1800 mm |
| 65 mm I-bar | 30 | 48.0 kN/m² | 22.0 kN/m² | 13.0 kN/m² | 8.5 kN/m² | 28.0 | 2500 mm |
| 75 mm I-bar | 30 | 65.0 kN/m² | 30.0 kN/m² | 18.0 kN/m² | 11.5 kN/m² | 32.0 | 3000 mm |
| 100 mm I-bar | 38 | 120.0 kN/m² | 55.0 kN/m² | 32.0 kN/m² | 21.0 kN/m² | 42.0 | 3600 mm |
All values for uniformly distributed load (UDL). For vehicle/forklift loads or concentrated point loads — use the design datasheet with safety factors. Pultruded bars must span in the correct direction. Cross bars provide lateral stability only — do not span in the cross bar direction without structural support.
Moulded vs Pultruded — Technical Comparison
| Property / Factor | Moulded GRP Grating | Pultruded GRP Grating | Verdict |
|---|---|---|---|
| Strength Direction | Equal biaxial (both directions) | Unidirectional (bar direction only) | Moulded for variable load; pultruded for defined span |
| Load Capacity at same depth | Moderate | Higher (~1.5–2× at same depth) | Pultruded wins for heavy load |
| Max. Span | Up to ~1200 mm (38mm) | Up to ~3600 mm (100mm bar) | Pultruded wins for long span |
| Customisability | High — mesh size, depth, resin, colour | High — bar depth/pitch, cross rod spacing | Both highly customisable |
| Open Area | ~65–75% | ~78–85% | Pultruded — better drainage |
| Weight (kg/m²) | 13–26 | 15–42 (depth dependent) | Moulded lighter for shallow depths |
| Anti-Slip Options | Integral gritted concave surface | Applied grit top / concave gritted | Moulded — integral (not added) |
| Chemical Resistance | Excellent (resin-rich surface) | Good (less resin-rich surface) | Moulded — better corrosion barrier |
| Fire Performance | Class 1 (ASTM E84) FR grades | Class I / Class B1 FR grades | Both achieve Class I with FR resin |
| Standard Panel Size | 1220×3660 mm (4′×12′) | 1220×3660 mm (4′×12′) | Same standard size |
| Typical Application | Walkways, platforms, trench covers, drainage | Heavy duty platforms, vehicle areas, long-span | Application dependent |
| Relative Cost | Medium | Medium–High | Moulded lower cost for standard service |
Correct fixing is critical — inadequately fixed grating panels become trip hazards and can fail under dynamic loading. Use only manufacturer-approved saddle clips and M-clips. Do not use standard steel washers against GRP.
- Clip TypesSaddle clip (M-clip) · Toggle clip · Side fixing clip · Retaining clip (removable panels)
- MaterialSS 316 (standard offshore / marine) · SS 304 (standard) · FRP moulded (non-metallic areas)
- Clip Qty.Min. 4 clips per 1220×3660 mm panel (OSHA 1910.23 requirement). Min. 1 per 500mm² bearing area.
- TorqueMax. 12–15 Nm (M10 SS clip) — do not over-torque GRP
- Removable PanelsUse toggle clips or quarter-turn retainers (tool-removable, tamper-resistant)
- Cut Panel SealingAll cut edges must be sealed with catalysed resin — prevents moisture ingress and wicking
Moulded GRP trench and drain covers for chemical plants, water treatment, food processing, and industrial flooring. Non-sparking, lightweight for maintenance access, and chemical resistant. Interlocking panels available for large trench areas.
- Load ClassesClass A15 (pedestrian) · Class B125 (light vehicle) · Class C250 (car park) — per BS EN 124
- Standard Widths150 mm · 200 mm · 300 mm · 400 mm · 500 mm · Custom
- Standard Lengths600 mm · 1000 mm · 1200 mm · custom per trench layout
- Frame TypeGRP angle frame · SS 316 channel frame · Polyester resin anchor frame
- Mesh Size25×25 mm · 38×38 mm · Solid top (food/pharma)
- InterlockingMale-female edge profile for continuous runs — prevents lateral movement
- Resin SystemsISO · VE · Phenolic
- Anti-SlipConcave gritted integral surface · Grit overlay
Complete GRP walkway system — grating panels, handrail post-and-rail, toe board (kick plate), and kerb angle — supplied as a coordinated system. Non-conductive, maintenance-free, and fully colour-matched. Corrosion-free alternative to painted steel handrails in chemical, marine, and offshore service.
- Handrail PostPultruded GRP square tube 50×50 mm · Round tube 50 mm OD · 1050 mm height (EN)
- Top RailPultruded GRP round tube 50 mm OD · Square 50×50 mm
- Mid RailPultruded GRP round tube 38 mm OD
- Toe BoardPultruded flat bar 150 mm height (min. per OSHA/EN) · Solid GRP kerb plate
- Post BracketsSS 316 base plate / clamp-on bracket / core-fixed into grating mesh
- Top Rail Load≥ 0.74 kN (750 N) horizontal — per OSHA 1910.29 / BS EN ISO 14122-3
- ColourYellow (safety standard) · Grey · Green · Custom
- ResinISO (standard) · VE · Phenolic (FR for marine/offshore)
Resin Selection
Resin determines chemical resistance, temperature capability, fire performance, and cost. Always specify resin based on the most aggressive chemical in the environment — not just splash risk, but full immersion and fume exposure.
Fire Performance — Standards & Classifications
| Standard | Classification | Test Method | Isophthalic FR | Vinyl Ester FR | Epoxy | Phenolic | Market |
|---|---|---|---|---|---|---|---|
| ASTM E84 | Class I (best) / Class II / Class III | Steiner tunnel test — flame spread + smoke | Class I (FR grade) | Class I | Class I | Class I | USA / North America |
| DIN 4102 | B1 (flame retardant) / B2 / B3 | Small flame test + building materials class | B2 standard / B1 FR grade | B1 FR grade | B1 | B1 | Germany / Europe |
| BS EN 13501-1 | Euroclass A–F (A1 best, F worst) | Multi-test Euroclass system | Class D–E (standard) / C (FR) | Class C–D (FR grade) | Class C–D | Class B | EU / UK (CE mark) |
| IMO A.653(18) | IMO fire test procedures | Radiant panel + smoke density (BSS 7239) | Not typically compliant | L (halogen-free VE) | ✓ (some grades) | ✓ Standard | Marine / Offshore (SOLAS) |
| ASTM D635 | HB (horizontal burn rate) | Self-extinguishing horizontal burn test | HB (FR grade) | HB | HB | Self-ext. | General reference |
FR = Fire Retardant grade. Standard (non-FR) gratings will burn — always specify FR resin for any application where fire risk exists. FR resin costs ~15–20% more but is mandatory for offshore, marine, and most chemical plant walkways. Flame retardant does not mean fireproof — it means the material self-extinguishes when the flame source is removed.
Key Features
FRP/GRP grating combines structural performance with properties that steel, aluminium, and concrete cannot offer in corrosive or electrically sensitive environments.
Standard Colour Options
Colour is integral to the resin — not a surface coating — and does not fade or peel. Custom RAL colours available on minimum order quantities. Colour does not affect structural or chemical resistance properties.
Applications — Key Sectors
FRP/GRP gratings eliminate the inspection, painting, and replacement cycle that steel gratings require in corrosive industrial environments. Whole-life cost savings of 2–4× over painted steel grating in aggressive service are well documented.
FRP/GRP Grating vs. Steel
FRP grating has a higher initial material cost than steel but delivers significantly lower whole-life cost in corrosive environments where steel grating requires inspection, painting, and periodic replacement.
| Property / Factor | FRP/GRP (VE resin) | Hot Dip Galv. Steel | Painted Steel | Aluminium | Stainless SS 316 |
|---|---|---|---|---|---|
| Weight (kg/m²) — 38mm | ~16 | ~48 | ~48 | ~17 | ~48 |
| Corrosion Resistance — Chemical | Excellent (no metal) | Poor (acids attack zinc) | Poor (paint fails) | Moderate | Good |
| Corrosion Resistance — Marine | Excellent | Moderate (zinc depletes) | Poor | Good (above waterline) | Good |
| Anti-Slip Surface | Integral (permanent) | Applied abrasive (wears) | Applied (wears) | Applied (wears) | Applied (wears) |
| Electrical Conductivity | Non-conductive | Conductive | Conductive | Conductive | Conductive |
| Magnetic | Non-magnetic | Magnetic | Magnetic | Non-magnetic | Non-magnetic |
| Fire Performance | Class I (FR grade) | Non-combustible | Non-combustible | Non-combustible | Non-combustible |
| Thermal Conductivity (W/mK) | 0.3–0.4 | 50 | 50 | 160 | 16 |
| Maintenance (5 yr cycle) | None | Inspect + recoat zinc | Inspect + repaint (2 yr) | Inspect | Inspect + passivate |
| Design Life (chemical plant) | 30–50 years | 5–15 years | 2–5 years (aggressive) | 10–20 years | 20–35 years |
| Cutting on site | Angle grinder (no hot work) | Cutting disc (hot work) | Cutting disc (hot work) | Angle grinder | Cutting disc (hot work) |
| Initial Material Cost | Medium–High | Low | Lowest | Medium | High |
| Whole-Life Cost (20yr, corrosive) | Lowest | Medium | Highest | Medium-Low | Medium |
Export Standards
All FRP/GRP gratings supplied with raw material batch records, fire test certificates (ASTM E84 / DIN 4102 / IMO), load test reports, and dimensional inspection records. Third-party certification available.
Request a Quote
Tell us grating type, resin, mesh size, panel dimensions, and export standard — we'll respond within 24 hours with pricing, datasheet, and lead time.
- Full material batch records and resin content certificates with every order
- ASTM E84 / DIN 4102 / IMO A.653 fire test certificates (FR grades)
- Load test reports per ASTM D4385 / EN 716 on request
- DIN 51130 slip resistance classification certificates available
- Third-party inspection — DNV, Lloyd's, BV, SGS, TÜV on request
- CE marking for European export — EN 13501-1 compliance
- Custom panel sizes, cut-to-shape, and non-standard mesh on request
- Complete walkway systems — grating + handrail + toe board + fixings
- Export packing — fumigated wooden crates, sea and air freight ready
