Inside Chemical Plants, Steel Grating Is Failing. Here Is What Engineers Are Specifying Instead.
- Apr 29
- 11 min read
Updated: May 1
Chemical and process plants are among the most demanding infrastructure environments on earth. The flooring and platform grating inside them is exposed to acids, alkalis, solvents, and heat — every day, for the full operational life of the facility. The material specification made at the outset determines whether that infrastructure is an asset or a liability for the next 30 years.
Published by Reinforce Technology | April 2026
The UK chemical and process industry is one of the country's most significant manufacturing sectors, contributing over £50 billion to the economy annually and operating facilities that run continuously, often 24 hours a day, 365 days a year. The UK government's 2025 Industrial Strategy identified advanced manufacturing — including chemicals and pharmaceuticals — as one of eight priority sectors for growth investment, with energy-intensive industries including chemicals receiving a 90% discount on network charges from 2026 to support the sector's competitiveness and decarbonisation (Chemistry World, 2025).
Inside chemical and process plants, the platforms, walkways, stair treads, trench covers, and drainage grating that allow operators to access, inspect, and maintain process equipment are some of the most persistently stressed secondary infrastructure elements in any industrial facility. They are exposed to chemical splashes, acid vapours, solvent contamination, and persistent humidity — simultaneously, continuously, across operational cycles that may span decades without a major shutdown.
Steel grating has been the default specification in most chemical plant environments for the better part of a century. It is strong, familiar, and available at a low purchase price. It is also fundamentally incompatible with the chemical environments it is asked to perform in — corroding at fixing points and cut edges within years, losing slip resistance as surface profiles degrade, and creating compounding safety and maintenance liabilities that accumulate across the operational life of the facility.
FRP (Fibre Reinforced Polymer) grating addresses every one of these failure modes through material science rather than maintenance regimes. This article sets out the industry context, the technical specification, and the cost and safety case for FRP grating in chemical and process plant environments.
Why Chemical Environments Destroy Steel Grating
Galvanised steel grating in a chemical plant environment faces a challenge that its protective coating is not designed to meet. The zinc galvanising layer on structural steel grating provides corrosion resistance through sacrificial protection — the zinc corrodes preferentially, protecting the underlying steel for as long as the zinc layer is intact. In a benign environment, that zinc layer can last many years. In a chemical plant, it lasts considerably less.
Acid vapours — from hydrochloric acid, sulphuric acid, phosphoric acid, and the dozens of other acids common in process chemistry — attack zinc coatings rapidly and continuously. Alkali compounds, cleaning agents, and solvent splashes each attack the coating through different chemical pathways, but the outcome is the same: once the zinc layer is breached, the underlying steel is exposed to the process environment, and corrosion begins. In chemical plant conditions, breach can occur within two to three years of installation at fixing points, cut edges, and any location where mechanical contact has disrupted the coating surface.
From that point, the failure mechanism is gradual but relentless. Rust progresses laterally from the breach points. Load bar cross-sections reduce as material is lost. Deflection under load increases as effective stiffness decreases. Slip resistance deteriorates as the surface profile degrades and rust scale creates an uneven, unpredictable walking surface. Eventually — and the timeline in an aggressive chemical environment is measured in years, not decades — the grating no longer meets the structural or safety requirements of its application.
The HSE's Workplace (Health, Safety and Welfare) Regulations 1992 require flooring to be suitable, in good condition, and free from risk of slipping. In a chemical plant where steel grating is corroding, those three requirements are in progressive conflict with the material's condition from the moment corrosion begins. The compliance liability accumulates alongside the safety risk — and both compound silently until an inspection forces the issue.
What FRP Grating Delivers in Chemical Plant Environments
1. Chemical Resistance — Matched to the Specific Environment
FRP grating does not corrode in chemical environments. Its resistance is not provided by a surface coating that can be breached — it is an intrinsic property of the composite matrix, consistent throughout the full cross-section of every load bar, at every cut edge, and at every fixing point. The specific level of chemical resistance is determined by the resin system, and selecting the correct resin for the specific chemicals present in each application is the most important technical decision in FRP grating specification.
Polyester resin provides excellent general-purpose chemical resistance for mild acids, alkalis, and humid industrial environments. It is the most cost-effective grade and appropriate for the majority of general industrial applications where chemical exposure is moderate. Vinyl ester resin provides substantially enhanced resistance to concentrated acids, solvents, chlorinated compounds, and the full range of aggressive process chemistry. It is the correct specification for the majority of chemical plant environments and represents the critical upgrade from polyester where the specific chemical exposure would compromise polyester performance. Phenolic resin provides the highest level of fire performance alongside chemical resistance, with low flame spread and low smoke emission ratings that meet the most demanding fire safety classifications — appropriate for environments where process chemistry creates fire or explosion risk alongside chemical exposure (Bedford Reinforced Plastics, 2025).
Specifying polyester resin in an environment that requires vinyl ester is one of the most consequential and most common errors in FRP grating procurement. The cost difference between the two is modest. The performance difference in an aggressive chemical environment is the difference between maintenance-free service and premature failure.
2. Anti-Slip Performance That Does Not Degrade
FRP moulded grating is manufactured with an integral grit surface — coarse grit bonded into the walking surface of every load bar during the moulding process. This anti-slip surface is not a coating applied after manufacture. It cannot be worn away by foot traffic, dissolved by chemical contact, or degraded by UV exposure. It provides consistent slip resistance in wet, oily, and chemically contaminated conditions from day one of installation to the end of the grating's operational life (FGPL, 2025).
In a chemical plant environment where liquid spills are a routine rather than exceptional occurrence, the anti-slip performance of the flooring is a safety-critical property that must be maintained continuously, not restored periodically. Steel grating's slip resistance depends on the condition of the surface profile — a property that deteriorates with corrosion and wear and cannot be restored without replacement. FRP's anti-slip performance is independent of corrosion because FRP does not corrode, and independent of surface wear because the grit is bonded into the material rather than applied to its surface.
3. Non-Sparking — Essential in ATEX and HAZLOC Environments
Chemical and process plants frequently operate in atmospheres where hydrocarbon vapour, solvent fumes, or other flammable gases create explosion risk — classified as ATEX zones in UK and European regulatory frameworks, or HAZLOC zones under US standards. In these environments, any secondary infrastructure material that can generate a spark under impact or friction creates an unacceptable ignition risk.
FRP grating is non-sparking. It does not generate sparks under impact, mechanical friction, or contact with falling objects — a property that is particularly important in process areas where dropped tools or equipment strikes against grating surfaces are operational realities rather than theoretical risks. Steel grating in the same environments can generate sparks under the same conditions, requiring either spark-proof surface treatments or operational restrictions that FRP eliminates entirely (FGPL, 2025).
4. Non-Conductive — Safety in Electrically Sensitive Process Areas
Process plants operate substantial electrical infrastructure — motor control centres, high-voltage distribution, instrumentation panels, and drive systems — in close proximity to the process areas where grating is used. FRP grating is electrically non-conductive. It cannot become an accidental current path in the event of an electrical fault, does not require bonding and earthing in the way that metal grating does in electrically sensitive areas, and eliminates a category of electrical risk that steel grating cannot (Jiuding Composite, 2023).
This non-conductivity is particularly relevant for the access platforms around electrical switchgear, motor control centres, and instrumentation enclosures that are a standard feature of any process plant. Specifying FRP grating on these platforms removes the need for the earthing specification that metal grating requires, simplifies the electrical safety design, and reduces the ongoing compliance documentation burden across the operational life of the facility.
5. Open Mesh Design — Drainage and Secondary Containment
FRP moulded grating has an open mesh area of 65 to 75% — providing unobstructed drainage of liquid spills, chemical contamination, and wash-down water directly through the grating surface to the drainage system below (FGPL, 2025). This drainage performance prevents the liquid pooling that creates both slip hazards and localised corrosion on conventional solid-top or closely-spaced steel grating, where liquids can pond between bar surfaces and accelerate corrosion from the underside of the panel.
Mini-mesh FRP grating — with apertures of 25x25mm — is specifically designed for sump covers, drain trench covers, and bund floor grating in chemical environments. The smaller aperture limits chemical spill-through while maintaining drainage performance, providing a level of secondary containment at platform level that conventional open-bar steel grating cannot match. In environments where chemical spill containment is a regulatory requirement, this is a specification advantage with direct compliance implications (FGPL, 2025).
The Technical Specification: Moulded vs Pultruded
FRP grating is manufactured in two fundamentally different forms, and understanding the distinction is essential for correct specification. Selecting the wrong type for an application can result in structural performance below design requirements — an error that is both consequential and entirely avoidable with proper technical guidance.
Moulded FRP grating is manufactured in a one-piece interwoven construction — continuous glass fibres running in both directions are impregnated with resin and cured in a single moulding operation. The result is a panel with equal strength in both directions (isotropic) that can be installed in any orientation and that tolerates cutouts — for pipe penetrations, equipment bases, or drainage points — without requiring additional structural support around the opening. Moulded grating is the standard specification for chemical plant applications where chemical resistance, anti-slip performance, and drainage are the primary requirements. It provides high impact resistance and bi-directional load capability across standard chemical plant span configurations.
Pultruded FRP grating is manufactured with continuous glass strands running the length of each load bar, assembled with cross-rods and bonded with epoxy. The higher glass content in the load bar direction provides greater span capability and higher load capacity than moulded grating for equivalent depths — making pultruded the correct specification for longer spans or heavier concentrated loading. It is anisotropic — the load bars must span between supports, and installing pultruded grating with load bars running parallel to the supports rather than across them reduces load capacity drastically. This installation orientation error is the single most common and consequential FRP grating specification mistake, and it underlines the importance of clear technical documentation and installer guidance on every project (Wikipedia, 2024).
For standard chemical plant walkway, platform, and stair tread applications, moulded grating in vinyl ester resin is the specification that delivers the broadest chemical resistance, consistent anti-slip performance, and maintenance-free service across the operational life of the facility. Pultruded grating in vinyl ester or epoxy resin is the correct upgrade for longer spans or heavier loading where moulded grating's span tables do not meet the structural requirement.
UK Standards and Compliance
FRP grating for industrial and chemical plant applications in the UK must comply with BS 4592 — the standard for industrial flooring performance, with Part 4 specifically addressing GRP (glass reinforced plastic) grating. Fire performance is assessed under BS 476 Part 7 and EN 13501-1, with Class 1 surface spread of flame ratings available from fire-retardant resin formulations. For ATEX zone applications, the non-sparking certification of FRP grating provides the compliance evidence that metal grating in equivalent applications requires additional surface treatment to achieve.
The Workplace (Health, Safety and Welfare) Regulations 1992 require floors to be suitable, in good condition, and free from obstructions and risk of slipping. The Management of Health and Safety at Work Regulations 1999 require employers to assess and actively manage slip and trip risks. FRP grating's maintenance-free anti-slip performance, corrosion immunity, and consistent structural integrity across its operational life are the material-level properties that deliver compliance with these regulations without the periodic intervention that steel grating requires (HSE, 2025).
Reinforce Technology supplies FRP grating products manufactured to BS 4592-4 with fire performance data to BS 476 Part 7, and can provide independent third-party test documentation for load performance, chemical resistance, and fire rating for each product in our range.
The Cost and Lifecycle Case
FRP grating carries a higher upfront material cost than galvanised steel — typically 1.5x to 2x depending on specification and panel size. In a chemical plant procurement context, where the purchase price line is visible and the lifecycle cost line is not, that premium frequently ends the specification discussion prematurely. Here is the comparison that should precede that conclusion.
A steel grating installation in a chemical plant environment carries, in addition to its lower upfront cost: corrosion inspection every two to three years; recoating or surface treatment where the zinc layer has failed, requiring specialist access, preparation, and materials; structural assessment as section loss from corrosion reduces load capacity; and replacement — typically required within 10 to 15 years in aggressive chemical environments — at a cost substantially exceeding the original installation. Each maintenance intervention in a live chemical plant also requires access planning, permit-to-work procedures, and in many cases partial process shutdown, all of which carry operational costs beyond the direct maintenance expenditure.
An FRP grating installation in the same environment carries a periodic visual inspection programme. No recoating. No structural assessment. No replacement within a 25 to 50-year service life. No access in live process areas for maintenance purposes.
At 70% lighter than equivalent steel panels, FRP grating also significantly reduces installation-phase manual handling injuries and reduces the crane requirements and crew sizes needed during plant construction, turnarounds, and panel replacement (FGPL, 2025). The installation cost saving on a large chemical plant platform replacement project can be significant — and on a turnaround where production downtime is valued by the hour, faster installation directly reduces the most expensive element of the intervention.
The break-even point — where FRP's lower maintenance cost has offset its higher purchase price — typically falls within 8 to 12 years of installation. For a chemical plant with a 20 to 30-year operational horizon, that means the substantial majority of the asset life is spent in net positive territory for FRP. The lifecycle cost case is not marginal. In a chemical environment, it is decisive.
Reinforce Technology FRP Grating for Chemical and Process Plants
Reinforce Technology supplies moulded and pultruded FRP grating systems for chemical plant, process industry, and industrial flooring applications across the UK and internationally. Our product range covers open mesh, mini mesh, and solid top configurations in standard panel sizes and cut-to-size for site-specific applications.
Available resin systems: polyester (general industrial), vinyl ester (chemical and process plant standard specification), and phenolic (fire-rated, ATEX and offshore environments). All products are manufactured in ISO 9001, ISO 14001, and ISO 45001 certified facilities and supplied to BS 4592-4 with full fire performance documentation to BS 476 Part 7 available on request.
We work with process plant engineers, HSE managers, facilities managers, EPC contractors, and procurement teams across the UK chemical, petrochemical, pharmaceutical, and general process industry. Contact us for technical data sheets, chemical resistance guides, load and span tables, resin system recommendations, and ATEX zone application guidance for your project.
As with any structural or infrastructure material, final confirmation of suitability for a specific chemical plant application remains the responsibility of the appointed project engineer or HSE manager. Reinforce Technology provides technical guidance and material recommendations based on the information supplied to us, but specification sign-off should always sit with the qualified professional responsible for the design. We are happy to provide full technical data sheets, chemical resistance guides, and application-specific support to assist with that review.
References
Chemistry World (2025) UK Industrial Strategy Prioritises Advanced Manufacturing and Life Sciences. Available at: https://www.chemistryworld.com/news/uk-industrial-strategy-prioritises-advanced-manufacturing-and-life-sciences/4021759.article [Accessed: April 2026].
Creative Fibrotech (2025) FRP vs Steel Cost: Complete Analysis for 20 Year Projects. Available at: https://creative-fibrotech.com/frp-vs-steel-cost/ [Accessed: April 2026].
FGPL (2025) FRP Grating Solutions for Chemical and Industrial Use. Available at: https://fibrograts.com/frp-grating-solutions/ [Accessed: April 2026].
HSE (2025) Slips, Trips and Falls — Employer Guidance. Available at: https://www.hse.gov.uk/slips/employers.htm [Accessed: April 2026].
NACE International (2016) International Measures of Prevention, Application and Economics of Corrosion Technology (IMPACT). Houston, TX: NACE International.
Wikipedia (2024) Fiberglass Reinforced Plastic Grating. Available at: https://en.wikipedia.org/wiki/Fiberglass_reinforced_plastic_grating [Accessed: April 2026].
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