Fosroc Nitoflor EU10
High-strength, self-smoothing three-component epoxy underlay for levelling and preparing concrete floors from 3 to 10 mm ahead of Fosroc resin flooring systems.
What is it?
A three-component (resin base, hardener and graded aggregate) self-smoothing epoxy underlay from Fosroc’s Nitoflor EU range, formulated to withstand chemical attack and impact shock while creating a sound, level base for resin flooring.
Where is it used?
Industrial and commercial concrete floors that need levelling or making-good before epoxy screeds, toppings or coatings are applied – warehouses, factories, pharma and food-processing plants, workshops and logistics floors.
Why use it?
It is an economical, high-strength way to correct undulations, falls and surface defects in one pass and produce a uniform substrate, avoiding pinholing and poor levels in the finished resin floor.
How is it applied?
After surface preparation and priming, the pre-weighed components are mixed and spread by notched trowel or squeegee to between 3 and 10 mm, then spike-rolled to release air; the topping is applied within the overcoating window.
About Fosroc Nitoflor EU10
Fosroc Nitoflor EU10 is a high-strength, self-smoothing epoxy underlay engineered to level and repair concrete floors before a decorative or heavy-duty resin system is laid. It belongs to Fosroc’s Nitoflor EU range of epoxy underlays and sits one step above Nitoflor EU5: where EU5 is designed for build-ups up to about 5 mm, EU10 is formulated for application across a 3-10 mm thickness range, making it the right choice when a slab has deeper undulations, worn patches or falls that need correcting in a single application. The product is a three-component system – a resin base, a resin hardener and graded aggregate fillers – that are blended on site to produce a trowellable, self-levelling mortar.
The role of an underlay like EU10 is often misunderstood on Indian sites, where teams sometimes try to correct an uneven slab with extra topping material or cement screed. Neither approach works well: epoxy toppings are expensive to use as fillers and a fresh cement screed introduces a weak, moisture-bearing layer that can debond the resin floor. EU10 solves both problems at once. It bonds tenaciously to a properly prepared concrete substrate, develops strengths in the same order as the structural concrete beneath it, and presents a smooth, dense face that a thin-build coating (such as Nitoflor FC140 or FC150) or a self-smoothing topping (such as Nitoflor SL2000) can be applied over without telegraphing defects from the slab below.
For specifiers and contractors in Delhi NCR and across India, EU10’s appeal is practical: it shortens programme time because one levelling pass replaces multiple screed-and-cure cycles, it is laid with standard resin-flooring tools, and it is part of a single-supplier Fosroc system so warranty and compatibility questions are straightforward. Space Arc Engineering, as an authorised Fosroc distributor and applicator, supplies EU10 alongside the primers, toppings and coatings that complete the build-up, and provides on-site guidance on substrate moisture, priming and overcoating windows – the three areas where resin underlay jobs most commonly go wrong.
The technical insight
Nitoflor EU10 is best understood as an aggregate-filled epoxy mortar rather than a thin coating. The graded fillers do two jobs: they bulk the resin economically so that thicker 3-10 mm builds are affordable, and they give the cured underlay its compressive and impact resistance. Because the binder is an epoxy and not cement, the cured layer is effectively non-shrink and has negligible water absorption, so it does not introduce a moisture or shrinkage plane between the slab and the finished floor. Within the Nitoflor EU family, performance is verified against international test methods – compressive strength to ASTM C579, flexural and tensile strength to BS 6319, and water absorption to BS 1881 – and the range complies with IS 4631:2001 (the Indian standard for epoxy resin floor toppings). The governing design rule for any EU underlay is substrate condition: the concrete must be sound, fully cured (new slabs at least 21 days old), surface-dry and below roughly 5% moisture, with laitance removed by grit-blasting, scabbling or grinding and a Fosroc epoxy primer applied so the underlay achieves a bond stronger than the tensile strength of the concrete itself. Pot life is limited once the three components are combined, so EU10 is mixed in full packs and placed in batches, never part-mixed.
Where it is used
- Levelling and regularising concrete floors before epoxy or PU resin systems
- Filling localised depressions, worn patches and trowel marks in industrial slabs
- Re-establishing falls to drains in wash-down and process areas
- Providing a smooth base for thin-film coatings such as Nitoflor FC140 / FC150
- Providing a base for self-smoothing toppings such as Nitoflor SL2000
- Making-good and resurfacing old concrete floors during refurbishment
- Building a chemical- and impact-resistant intermediate layer in process plants
Key advantages
- Economical way to level floors 3-10 mm in a single application versus multiple screed cycles
- High compressive and impact strength once cured, comparable to the structural slab
- Self-smoothing and seamless, producing a uniform face for the topping
- Epoxy binder gives negligible water absorption and no drying shrinkage
- Resists chemical attack and impact shock during service and over-application
- Laid quickly with standard resin-flooring tools (notched trowel, squeegee, spike roller)
- Part of a single-source Fosroc flooring system for guaranteed compatibility
- Complies with IS 4631:2001 and is verified to ASTM C579 / BS 6319 test methods
Limitations & considerations
- It is an underlay/levelling layer, not a finished wearing surface – it needs a topping or coating over it
- Demands thorough substrate preparation: grinding/blasting, dust removal and priming are mandatory
- Sensitive to substrate moisture; slabs above ~5% moisture or subject to rising damp need a DPM first
- Limited pot life once mixed, so it must be batched and placed promptly; no part-mixing
- Application and cure rates are temperature-dependent, which matters in Indian summer and monsoon conditions
- Strict overcoating window – the topping must be applied within the specified time band for inter-coat adhesion
- Higher material cost than a cement levelling screed (offset by performance and programme savings)
- Not a structural repair mortar for deep spalls or full-depth concrete reinstatement
Selection & best practice
Treat EU10 as the make-or-break preparation layer. Verify the slab is at least 21 days old, surface-dry and below about 5% moisture (install a damp-proof membrane first if rising damp is possible); mechanically prepare the surface by grinding, scabbling or grit-blasting to remove laitance, oil and old coatings, then remove all dust. Apply the recommended Fosroc epoxy primer and let it become touch-dry but not tacky before placing EU10. Mix full three-component packs only – never part-mix – using a forced-action or paddle mixer, add the aggregate gradually and blend to a homogeneous consistency, then place by notched trowel or squeegee to the required 3-10 mm and spike-roll to release entrained air. Work within the pot life and discard any material that has started to stiffen, and apply the chosen Fosroc topping inside the specified overcoating window so the floor bonds as one monolithic system. Continue all substrate expansion joints up through the underlay and topping. In NCR summer heat, plan smaller batches and consider cooler hours of the day to protect workability.
Specifications
| Product type | High-strength, self-smoothing epoxy levelling underlay (Nitoflor EU range) |
| Composition | Three-component: resin base, resin hardener and graded aggregate fillers |
| Application thickness | 3-10 mm (single application range) |
| Primary use | Levelling / preparing concrete before epoxy screeds, toppings and coatings |
| Standards compliance | IS 4631:2001 (Nitoflor EU range) |
| Verification test methods | Compressive ASTM C579; flexural & tensile BS 6319; water absorption BS 1881 Part 122 |
| Compatible toppings/coatings | Nitoflor FC140, Nitoflor FC150, Nitoflor SL2000 and other Fosroc resin toppings |
| Substrate | Sound, primed concrete; new slabs min. 21 days old; moisture below ~5%; no rising damp |
| Mixing | Full packs only, forced-action or paddle mixer; no part-mixing |
| Placing tools | Notched trowel / squeegee, finished with a spike roller |
| Indicative supply | Approx. 12 litre, 3-component packs (distributor listing; confirm current Fosroc pack at order) |
| Water absorption | Negligible (epoxy binder) |
Industry use cases
Warehousing & logistics
Levels worn or out-of-tolerance floors and re-establishes flatness before a high-build epoxy coating is laid for forklift and pallet traffic.
Food & beverage processing
Creates a smooth, falls-corrected base in wash-down and HACCP areas ahead of a hygienic self-smoothing topping such as Nitoflor SL2000.
Pharmaceutical & clean manufacturing
Produces a defect-free, low-absorption intermediate layer so the finished resin floor meets cleanroom flatness and cleanability requirements.
Engineering & automotive workshops
Fills depressions and impact damage in old slabs during refurbishment, restoring a sound base for a chemical- and impact-resistant topping.
Cold stores & process plants
Provides a strong, chemically resistant underlay that bonds to the slab and carries thin-film Fosroc FC-series coatings in service areas.
Commercial & institutional fit-outs
Regularises existing concrete in showrooms, kitchens and utility areas so a decorative resin finish lays flat without telegraphing slab defects.
Frequently asked questions
What exactly is Fosroc Nitoflor EU10 used for?
How is EU10 different from Nitoflor EU5?
Is EU10 a finished floor on its own?
What thickness can EU10 be applied at?
What surface preparation does EU10 need?
Does Nitoflor EU10 meet Indian standards?
Can Space Arc supply EU10 with the rest of the floor system?
How we position Fosroc Nitoflor EU10
Within the Fosroc range, Nitoflor EU10 is the deeper-build companion to Nitoflor EU5 and the substrate-preparation partner for Fosroc’s finishing systems – it is laid first, then overcoated with thin-film coatings such as Nitoflor FC140 / FC150 or self-smoothing toppings such as Nitoflor SL2000, usually over a Fosroc epoxy primer. Specifying the whole stack from one manufacturer keeps compatibility and warranty clean. Where a project team is comparing brands, credible equivalents exist for the levelling/screed-preparation step: Sika offers epoxy levelling and screed mortars in its Sikafloor range, MBCC/MBS (Master Builders Solutions, the former BASF construction-chemicals line) offers Mastertop epoxy systems, STP (Saint-Gobain) carries Zentrifix/industrial flooring options, and Dr. Fixit (Pidilite) competes more at the coating and waterproofing end than on heavy epoxy underlays. For most Indian industrial floors, the deciding factors are documented IS 4631 compliance, single-source system compatibility, local technical support and applicator track record – which is where sourcing EU10 and its companion products together through Space Arc Engineering, as an authorised Fosroc distributor and applicator, is the pragmatic route.
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Source Fosroc Nitoflor EU10 for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.