Fosroc Nitocote ET440E
High-build, tar-extended epoxy coating that armours concrete and steel against corrosion in marine, sewage, effluent and buried environments.
What is it?
A two-pack, tar-extended (coal-tar modified) epoxy resin coating from Fosroc, formulated for high film build in a single application and long-term corrosion protection of concrete and metal.
Where is it used?
Marine structures, jetties and sheet piling, pipe lining and coating, sewage and effluent treatment plants, power and oil & gas facilities, channels, culverts, tank foundations and below-ground concrete and steel.
Why use it?
It combines the chemical and abrasion resistance of epoxy with the impermeable, anti-corrosive barrier of coal tar, giving a tough, waterproof film that resists water, sewage, salts and dilute chemicals in aggressive service.
How is it applied?
Mix the pre-weighed two-pack, then apply by brush, roller or airless spray over a properly prepared substrate (grit-blasted steel, laitance-free concrete), typically as a two-coat high-build system.
About Fosroc Nitocote ET440E
Fosroc Nitocote ET440E is a protective coating from the Nitocote ET family, the tar-extended (coal-tar modified) epoxy range that Fosroc has long supplied for heavy-duty corrosion protection of concrete and steel. The Fosroc product page describes it specifically as a “tar-extended epoxy resin coating” engineered to protect concrete and metal structures in some of the most aggressive service environments encountered on Indian infrastructure and industrial projects: marine structures, pipe lining and coating, sheet piling, industrial coatings in power plants and oil & gas refineries, sewage treatment and effluent plants, channels, culverts, tank foundations, and below-ground protection of concrete and steel. In chemical terms the system blends epoxy resins with coal tar (pitch). The epoxy fraction delivers adhesion, hardness, abrasion resistance and resistance to dilute acids, alkalis and many solvents; the coal-tar fraction contributes a dense, impermeable, water-excluding barrier that resists sea water, raw sewage and ground water and does not support bacterial or marine growth. The result is a coating that behaves as both a corrosion barrier and a waterproofing membrane in one application. ET440E is supplied as a pre-weighed two-pack (base resin plus hardener) ready for site mixing, and Fosroc highlights three headline benefits on the product page: high film build in a single application, easy application by brush, roller or airless spray, and long-term protection. The “E” suffix and the 440 grade place it within the same lineage as the well-known Nitocote ET402 / ET402E and ET140 coal-tar epoxies that Indian contractors have specified for decades on water-retaining and marine assets; ET440E is the higher-build, contemporary expression of that chemistry. For Space Arc Engineering’s customers in Delhi NCR and across India, this makes ET440E a credible choice wherever buried or immersed concrete and steel need a single, robust anti-corrosive barrier rather than a thin decorative paint.
The technical insight
The defining characteristic of a tar-extended epoxy like ET440E is its high-build behaviour: it is designed to lay down a thick wet film (the ET family is typically applied at around 200 microns wet film per coat) so that a two-coat application delivers a substantial dry film thickness without the multiple thin passes a conventional paint would need. That thickness is what creates the impermeable, corrosion-resistant barrier. Because coal tar is hydrophobic and chemically inert, the cured film excludes water and resists the electrochemical conditions that drive corrosion of rebar and steel. Two practical points follow. First, surface preparation governs performance far more than product choice: steel must be abrasive (grit) blasted to a bright finish meeting Sa 2½ (Swedish Standard SA 2½) with an adequate anchor profile, and concrete must be free of laitance, dust, grease and surface irregularities, blast-cleaned or etched and dry, with prep typically referenced to ACI 503R. On properly prepared concrete the Nitocote ET coatings are primerless, but freshly blasted steel should be coated promptly (or held with a compatible primer such as Nitoprime 25) to prevent flash rust. Second, this is a solvented, amine-cured epoxy, so it has a finite pot life that shortens sharply with temperature, it must be force-ventilated in confined spaces, and over-thick or under-cured films can solvent-entrap or sag. Contractors should always work to the current, country-specific ET440E Technical Data Sheet for the exact mix ratio, coverage, film thickness, pot life and curing figures applicable to their batch and ambient conditions, since Fosroc revises these per market.
Where it is used
- Below-ground and buried protection of concrete foundations, pile caps and tank bases
- Coating of steel and concrete in sewage treatment works, effluent and ETP/STP tanks and channels
- Marine and coastal structures: jetties, piers, docks, sheet piling and sea-water intakes
- Internal and external lining and coating of pipes and pipelines against corrosion
- Water-retaining and water-conveyance structures such as culverts, channels and reservoirs
- Corrosion protection in power plants, oil & gas refineries and chemical-processing facilities
- Tank foundations and plinths exposed to spillage, condensation and ground moisture
Key advantages
- High film build achievable in a single application, reducing the number of coats and labour passes
- Combines epoxy chemical/abrasion resistance with coal-tar impermeability in one barrier coating
- Acts as both an anti-corrosive coating and an effective waterproofing layer
- Primerless on properly prepared concrete, saving a material and a labour step
- Versatile application by brush, roller or airless spray for varied geometries and access
- Resists sea water, raw sewage, ground water, salt solutions and dilute acids/alkalis
- Tough, abrasion-resistant cured film suited to immersed and buried long-term service
- Does not support bacterial or marine growth, extending service life on sewage and marine assets
Limitations & considerations
- Contains coal tar (pitch) and solvent: requires proper PPE, organic-vapour respirators and forced ventilation, especially in tanks and confined spaces
- Tar-extended epoxies are dark (black/brown) only and are not suitable where a decorative or light-colour finish is required
- Should not be over-applied on top of unknown existing coatings; best applied to bare prepared substrate or over itself
- Pot life is short and shortens further in hot weather; mixed material must be used promptly
- Demands high-quality surface preparation (Sa 2½ blast on steel; laitance-free, dry concrete) or adhesion and barrier performance suffer
- Application below roughly 5 to 15 degrees C or in high humidity slows cure and can discolour the film; accelerated heating must not be used
- Solvented, so flammability and naked-flame precautions apply during storage, mixing and application
Selection & best practice
Treat surface preparation as the project, not a preliminary. Grit-blast steel to Sa 2½ with a sound anchor profile and coat it promptly (or hold it with Nitoprime 25) to avoid flash rust; on concrete, remove all laitance, grease and dust, make good surface defects with a Fosroc repair mortar, and ensure the substrate is dry before coating. Mix the full pre-weighed two-pack mechanically with a slow-speed paddle for the specified time, apply two coats to the target wet-film thickness within the stated overcoating window, and respect the pot life, which collapses in NCR summer heat, by mixing only what the crew can place. In tanks and other confined spaces, enforce forced ventilation, organic-vapour respirators and full PPE, and keep ignition sources away from solvent-laden vapour. Always verify the current country-specific ET440E TDS for the exact mix ratio, DFT, coverage, pot life and cure data, and request batch and ambient-condition guidance from Space Arc Engineering before mobilising.
Specifications
| Product type | Tar-extended (coal-tar modified) epoxy resin protective coating (per Fosroc product page) |
| Components | Two-pack: base resin + hardener, pre-weighed for site mixing |
| Colour | Black / brown (tar-extended epoxy; family-typical) |
| Application methods | Brush, roller or airless spray (per Fosroc product page) |
| Number of coats | Typically 2-coat application (ET tar-epoxy family practice) |
| Wet film thickness | Approx. 200 microns per coat for the ET tar-epoxy family; high-build in single application (confirm on ET440E TDS) |
| Priming | Primerless on properly prepared concrete; steel coated promptly or primed with Nitoprime 25 (family practice) |
| Steel surface prep | Grit blast to bright finish, Swedish Standard Sa 2½ (family requirement) |
| Concrete surface prep | Laitance-free, dust/grease-free, dry; prep to ACI 503R (family requirement) |
| Cleaning solvent | Nitoflor Sol, immediately after use (family practice) |
| Chemical resistance | Resists sea water, raw sewage, ground water, salt solutions and dilute acids/alkalis (ET-family tested data) |
| Key benefits (official) | High film build in single application; easy brush/roller/airless spray; long-term protection |
| Note on figures | Exact mix ratio, coverage, DFT, pot life, cure and pack sizes must be read from the current country-specific Fosroc ET440E TDS |
Industry use cases
Water & Wastewater (STP/ETP)
Lining of sewage and effluent tanks, channels and clarifiers in municipal STPs and industrial ETPs, where the coal-tar epoxy resists raw sewage and effluent and does not support bacterial growth.
Marine & Ports
Protection of jetties, piers, docks, sheet piling and sea-water intakes along India’s coastline against chloride-driven corrosion and immersion in sea water.
Oil, Gas & Power
Industrial corrosion coatings on steel and concrete in refineries, petrochemical units and power plants, including bunds, plinths and process structures exposed to spillage and condensation.
Pipelines & Buried Infrastructure
Internal/external coating of pipes and below-ground protection of foundations, pile caps and tank bases where buried concrete and steel face soil moisture and aggressive ground water.
Hydraulic & Water-Conveyance Structures
Coating of culverts, channels, intakes and reservoir surfaces to provide a combined waterproof and anti-corrosive barrier.
Frequently asked questions
Is Fosroc Nitocote ET440E a real product?
What type of coating is ET440E chemically?
Where should ET440E be used?
How is ET440E applied, and does it need a primer?
What surface preparation does ET440E require?
What are the main alternatives to Nitocote ET440E?
How we position Fosroc Nitocote ET440E
Within the Fosroc protective-coatings portfolio, Nitocote ET440E sits in the tar-extended (coal-tar) epoxy family alongside Nitocote ET402 / ET402E and the older ET140, all sharing the same coal-tar-modified epoxy chemistry; ET440E is the high-build expression aimed at marine, sewage, pipeline and below-ground duty. Where a coal-tar-free, lighter-coloured or potable-water-compatible epoxy is needed, Fosroc’s Nitocote EP range (for example the solvent-free EP405 for potable water) is the natural cross-reference, and surface preparation and patch repairs are handled with companion products such as Nitoprime 25, Nitomortar and Nitoflor Sol. Against the wider Indian market, ET440E competes with coal-tar and high-build epoxy coatings from Sika (Poxitar and Sikagard lines), MC-Bauchemie (MBS), Dr. Fixit and STP (Pidilite), each of which offers comparable immersion-grade barriers; the right choice depends on exposure, colour and potable-water requirements rather than brand alone. As an authorised Fosroc distributor and applicator serving Delhi NCR and Pan-India, Space Arc Engineering supplies genuine ET440E, helps match it against these alternatives, and supports the system with verified, TDS-backed specification and application guidance. Note: while the chemistry, uses and headline benefits here are confirmed from Fosroc’s official ET440E page, the detailed film-thickness, coverage, pot-life and cure figures cited are typical of the Nitocote ET tar-epoxy family (ET402/ET140) and must be confirmed against the current country-specific ET440E Technical Data Sheet before specification.
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