FRP Grating FAQ

FRP (fiberglass reinforced plastic) grating is an open-grid panel of glass fibre in a polyester, vinyl ester or phenolic resin. It replaces steel and cast-iron grating where corrosion, weight, electrical insulation or anti-slip matter. See our selection process and molded grating range.

They describe the same material: FRP, GRP (glass reinforced plastic) and GFRP are interchangeable; 'fibreglass' is the British spelling. ZeAllgrate manufactures both molded and pultruded grating under all these names.

With the correct resin, ZeAllgrate FRP grating delivers typically 20+ years with no painting in corrosive service, vs. steel that corrodes within a few years. Service life is set by resin and environment — see the sustainability and service-life article.

It is non-conductive, non-sparking, non-magnetic and inherently anti-slip, and it will not rust into a slippery surface. See electrical insulation and anti-slip surfaces.

Walkways, platforms, trench covers, stairs and drainage in wastewater, chemical, power, marine, food and solar applications. Browse the industries and technical library.

We supply panels, covers, profiles, handrail, ladders/stairs and clips & accessories as one matched package.

Molded is bi-directional, impact-tough and economical up to ~1.2–1.5 m spans; pultruded is ~2x stiffer for long spans and heavy, uni-directional loads. See selection process and span/load.

Isophthalic (ZeAll ISO) for general industry and dilute chemistry; vinyl ester for strong acids, oxidizers and chlorine; phenolic for fire/smoke-critical zones. Match it to your chemical list in the chemical resistance guide.

Concave/convex are the standard inherent anti-slip finish; grit-top (bonded silica) gives maximum wet traction for permanently wet, food and marine areas. See anti-slip surfaces and the COF data article.

Yes — ADA requires openings ≤13 mm (1/2 in). Standard mesh fails; 12.7 mm mini-mesh passes. See the ADA mini-mesh article.

A resin skin over the bars that retains product/liquid on the surface for food, pools and trench covers. See grating covers and the cover selection guide.

Thickness and mesh are chosen by span and live load from certified load/span tables. Send span, load and occupancy and we return the recommended configuration.

Molded panels carry typical walkway loads; pultruded panels carry heavier loads and longer spans. Values come from certified load/span tables with 4:1–5:1 safety factor and deflection limits — see span/load calculation.

Design to a deflection limit (L/100–L/200) and a working-load safety factor; see the worked examples in how to read load-span tables and span/load calculation.

FRP is orthotropic — it expands ~2–3x more across the panel than along the bars. Size gaps from ΔL = L·α·ΔT; see thermal expansion and outdoor thermal design.

Yes — size for cyclic wheel loads and check natural frequency to avoid resonance. See fatigue & dynamic loading and vibration & natural frequency.

FR grades meet ASTM E84 Class B; extra-FR reaches Class A (≤10 flame spread); phenolic gives the lowest smoke/toxicity for escape routes. See fire ratings.

Use bolted/clipped joints (FRP cannot be welded), SS316 hardware in chloride, snug torque and one fixed/one sliding support. See connection design details and structural connections.

Yes — with carbide-tipped tools and dust PPE. Band or seal every cut edge. See cutting & cut-outs and the installation guide.

Fasten every support intersection: minimum four clips per panel, spacing ≤1200 mm. Choose clip type by panel style — see clips & accessories and connection details.

Snug only — M8: 8–12 N·m, M10: 15–22 N·m. Never use an impact wrench. See the fastener torque article.

3–5 mm standard at ends and abutting edges; 6–8 mm on long/hot panels; one end fixed and one slotted; dividers every 6–9 m. See thermal expansion.

≥50 mm on each support for molded, ≥75 mm for pultruded. Flatness ±5 mm over a 2 m straightedge. See installation tolerances & leveling.

Yes — re-check clips at 6 months, then annually; panels bed in and relax under clip pressure. See the torque standards article.

Water + mild detergent, soft brush, high-pressure wash ≤100 bar; avoid solvents, steel wool and abrasive pads. See the cleaning & disinfection article.

Touch up minor surface damage with matching gel-coat; replace a cracked or delaminated panel — modular design makes swaps easy. Never load-bond a severed bar. See QA & inspection.

Annual walkdown for chalking, blistering, veil integrity and clip tightness; increase to twice-yearly in high-vapor or hot service. See cooling-tower maintenance for a worked programme.

UV-stabilized, C-veiled resin chalks slowly and holds colour for 15–25 years outdoors; unstabilized resin degrades in 2–5 years. See UV weathering.

In chloride service the clips outlast no one — specify SS316 and re-torque annually. See connection details.

On audible delamination (tap-test), through-thickness cracking, a severed bearing bar or widespread veil loss. Keep 5–10% spare panels on site — see incoming inspection.

Standard panels: 7–15 days; custom fabrication 15–25 days. MOQ is flexible and samples are available. See downloads and contact us for a current schedule.

Yes — A5/A4 coupons are free (freight collect) for inspection and colour matching; a trial production panel can be ordered for load/chemical testing. Email sales@izeall.com.

Yes — cut-to-size, drilled, notched, banded panels and Pantone-matched colours to a signed fabrication drawing. See the custom fabrication tolerances article and CAD/BIM resources.

Panels are palleted, banded, edge-protected and breathable-wrapped; 20 ft GP holds ~250–280 m², 40 ft HQ ~550–650 m² of 38 mm molded. See the export packaging & shipping article.

We quote FOB, CFR, CIF, DAP and DDP (Incoterms 2020) with packing list, COA, certificate of origin and SGS/BV inspection on request. See contact us.

Send environment (chemicals/concentration/temperature), span, live load, panel quantity and destination; we return panel selection, load/span data and a written quote. See selection process.

COA per batch (resin, glass content, batch number), load test reports and ASTM test reports travel with every shipment. Our facility is ISO 9001:2015 certified; marine grades carry DNV & ABS approvals; third-party SGS & Intertek inspection and testing is available on request. See standards & compliance and ASTM test methods.

ASTM (D638, D790, D695, E84, D696, G154, C581), ISO 14122, OSHA 1910.23 and ADA. See standards & compliance.

Yes — offshore-grade VE and phenolic with SS316 hardware and documentation packages for class review. See the offshore DNV/ABS article and offshore industry.

Food-grade/washdown-compatible resin with a cleanable surface is available for food and pharma zones. See food processing and the cleaning article.

Yes — SGS, BV or Intertek inspection before container closure on request, with a field acceptance checklist. See QA & inspection.

Charts are validated by physical panel tests; ask for the test report for your grade and configuration. See load/span tables and reading load-span tables.