Fosroc Nitocote EN901
Solvent-free, 100% solids epoxy novolac protective coating delivering broad-spectrum chemical resistance (pH 1-14) for concrete and steel in aggressive industrial environments.
What is it?
A two-part, solvent-free, highly cross-linked, high-build epoxy novolac coating supplied as a grey, 100% solids system that brushes or rolls onto concrete and steel.
Where is it used?
Aggressive chemical-exposure zones in industry and infrastructure: effluent and sewage treatment plants, desalination units, food processing floors, chemical and fertiliser plants, refineries, power stations and pulp/paper mills.
Why use it?
It offers exceptionally broad chemical resistance across the full pH 1-14 range plus strong abrasion resistance and adhesion, with no solvent emissions, making it suited to confined tanks and sumps where solvented coatings are impractical.
How is it applied?
Surfaces are prepared and primed-free; the base and hardener are blended and applied by stiff nylon brush or short-nap roller in two coats to a minimum 400-micron total dry film thickness.
About Fosroc Nitocote EN901
Fosroc Nitocote EN901 is a heavy-duty protective coating engineered for structures that face relentless chemical attack. Chemically it is an epoxy novolac, a more densely cross-linked relative of standard bisphenol epoxies, which is what gives it the ability to withstand strong acids, alkalis, solvents, oils and oxidising agents that would degrade conventional epoxy or polyurethane films. The product is solvent-free and 100% solids, so the entire applied wet film converts to a durable dry film with no shrinkage from evaporating solvents and no solvent vapour, an important practical advantage when lining tanks, sumps and other poorly ventilated spaces.
Supplied as a two-component grey material (base and hardener), Nitocote EN901 is designed to be used without a separate primer on properly prepared substrates, simplifying the application sequence on site. It bonds tenaciously to suitably prepared concrete and mild steel and is applied in two coats to reach a minimum total dry film thickness of 400 microns, with higher build specified for more severe duty. For Indian contractors and consultants, the coating sits in Fosroc’s protective-coatings range alongside products such as Nitocote ET (epoxy) and Dekguard surface coatings, but EN901 occupies the high chemical-resistance tier where novolac chemistry is genuinely required rather than nice to have. Space Arc Engineering supplies and applies Nitocote EN901 as an authorised Fosroc distributor and applicator across Delhi NCR and pan-India.
The technical insight
The defining feature of Nitocote EN901 is its novolac backbone. Epoxy novolac resins carry multiple epoxide groups per molecule, so on curing they form a tighter three-dimensional network than the difunctional bisphenol-A epoxies used in general-purpose coatings. That higher cross-link density translates directly into resistance to permeation and chemical breakdown, which is why EN901 holds up across the entire pH 1-14 spectrum at 25°C where standard epoxies are typically limited to mild acid/alkali exposure. Because the system is 100% solids and solvent-free, there are no micro-voids left behind by evaporating solvent, producing a dense, low-permeability film that resists the very chemicals it is meant to exclude. The practical trade-off is a relatively short working window: pot life is about 45 minutes at 23°C, so mixed material must be applied promptly. Build is controlled per coat (up to roughly 200 microns on vertical surfaces using a stiff nylon brush or short-nap roller) to avoid sag, and the two-coat regime ensures a continuous, pinhole-minimised barrier at the specified 400-micron minimum DFT.
Where it is used
- Internal lining of effluent, sewage and wastewater treatment tanks, channels and sumps
- Protection of concrete and steel in desalination and water treatment plants
- Floors, bund walls and containment areas in chemical and fertiliser manufacturing units
- Lining of process tanks and structures in petroleum refineries and petrochemical plants
- Abrasion- and chemical-resistant surfaces in pulp and paper mills
- Food and beverage processing areas requiring a hygienic, chemical-resistant finish
- Corrosion protection of mild steel structures exposed to aggressive industrial atmospheres
- Secondary containment and spill-protection coatings in power generation facilities
Key advantages
- Broad chemical resistance across the full pH 1-14 range, covering strong acids and alkalis
- Solvent-free and 100% solids, so suitable for confined tanks and low-ventilation spaces with minimal odour and no solvent shrinkage
- High-build epoxy novolac film gives a dense, low-permeability barrier
- Excellent adhesion to properly prepared concrete and mild steel
- Excellent abrasion resistance for traffic and flow-exposed surfaces
- Designed for use without a separate primer, streamlining application
- Bonds to multiple substrates from a single product specification
- Long shelf life of around two years in unopened containers
Limitations & considerations
- Short pot life of about 45 minutes at 23°C demands quick application of mixed material
- Requires thorough, specification-grade surface preparation (blasting/grinding) for the no-primer performance to hold
- As a 100% solids epoxy novolac it is sensitive to low temperatures and high humidity during cure, which can affect cure and finish
- Grey is the standard colour, offering limited aesthetic/decorative options
- Manual brush/roller application means film build and uniformity depend on applicator skill
- Like most epoxies it can chalk and lose gloss under prolonged UV exposure, so it is primarily an immersion/industrial-protection product rather than a decorative topcoat
- Higher material cost than general-purpose epoxy coatings, justified only where genuine novolac-grade chemical resistance is needed
Selection & best practice
Specify Nitocote EN901 only where chemical exposure genuinely warrants novolac chemistry; for milder duty a standard epoxy is more economical. Prepare concrete by grinding or light blasting to a sound, dry, laitance-free profile, and prepare steel by abrasive blasting to a clean bright finish; ensure substrates are dry and above dew point before coating. Mix the full base and hardener units together in the correct proportions, never part-packs, and only mix what the team can apply within the ~45-minute pot life at site temperature. Apply two coats by stiff nylon brush or short-nap roller, keeping each coat within the recommended build (around 200 microns max on verticals) to avoid sag, and respect the 4-16 hour overcoating window at 23°C so inter-coat adhesion is not compromised. Allow the full 7-day cure at 20°C before exposing the lining to aggressive chemical service or immersion. Always confirm the exact chemical-resistance chart, mixing ratio and current values against the latest country-specific Fosroc TDS for the project chemicals.
Specifications
| Chemical type | Two-part, solvent-free, high-build epoxy novolac coating |
| Solids content | 100% solids (solvent-free) |
| Colour | Grey |
| Application method | Stiff nylon brush or short-nap roller |
| Number of coats | Two coats |
| Total dry film thickness | 400 microns minimum (higher can be specified) |
| Max film thickness per coat (vertical) | approx. 200 microns |
| Coverage | approx. 10 m² per pack at 400 microns DFT |
| Pot life | approx. 45 minutes at 23°C |
| Touch dry | approx. 4 hours at 23°C |
| Overcoating interval | 4 to 16 hours at 23°C |
| Full cure | 7 days at 20°C |
| Chemical resistance | pH 1-14 at 25°C |
| Suitable substrates | Properly prepared concrete and mild steel |
| Primer | Designed for use without a separate primer |
| Pack size | 4 litre packs |
| Shelf life | Approx. 2 years (12 months min per some markets) in unopened containers |
Industry use cases
Water & Wastewater
Lining of effluent and sewage treatment tanks, aeration channels and sumps where concrete and steel face continuous immersion in chemically aggressive, variable-pH liquors.
Chemical & Fertiliser Plants
Protection of floors, bunds, trenches and containment structures against spillage and immersion in strong acids, alkalis and process chemicals across the full pH range.
Oil & Gas / Refineries
Internal coating of process tanks and structural steel in refineries and petrochemical units exposed to hydrocarbons, oils and corrosive process streams.
Power Generation
Secondary containment and chemical-resistant linings in thermal and power stations, including FGD and effluent-handling areas subject to acidic attack.
Pulp, Paper & Food Processing
Abrasion- and chemical-resistant surfaces for mills and food/beverage facilities needing a dense, cleanable, solvent-free finish in wet, aggressive environments.
Frequently asked questions
Is Fosroc Nitocote EN901 a real product, and what exactly is it?
What chemical resistance does Nitocote EN901 offer?
How is it applied and how many coats are needed?
What is the pot life and cure time?
What coverage and pack size should I plan for?
How does it compare with other coatings available in India?
How we position Fosroc Nitocote EN901
Nitocote EN901 sits at the high chemical-resistance end of Fosroc’s protective-coatings portfolio. Where general-purpose epoxies such as Nitocote ET, or surface coatings like the Dekguard range, handle moderate exposure and weathering, EN901’s epoxy novolac chemistry is reserved for severe acid, alkali and solvent service across the full pH 1-14 spectrum; it pairs naturally with Fosroc’s Nitomortar and Renderoc concrete-repair systems where damaged substrates must be reinstated before lining. Among credible alternatives available in India, Sika offers epoxy novolac tank linings, while Dr. Fixit and STP (Pidilite) and MBS supply protective and chemical-resistant coatings that compete on milder-to-moderate duty; for the most aggressive immersion conditions, a novolac-grade product like EN901 or its Sika equivalent is the appropriate specification. As an authorised Fosroc distributor and applicator, Space Arc Engineering positions EN901 for clients who need verified novolac performance with correct surface preparation and application rather than an over-specified or under-specified general epoxy. Buyers should always confirm the exact mixing ratio, density and chemical-resistance data against the current country-specific Fosroc technical data sheet for their project chemicals.
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