Fosroc Nitobond E225
Two-component, colour-matched thixotropic epoxy mortar for rigid steel-to-concrete fixing and structural repair work.
What is it?
A two-component epoxy mortar from Fosroc with white and grey components that mix to a uniform colour, used both as a high-strength fixing adhesive and as a thixotropic repair/strengthening mortar.
Where is it used?
Rigid fixing of steel elements, dowels and plates to concrete and precast units, plus patch repair and section strengthening of beams, columns and slabs in industrial, infrastructure and water-retaining structures.
Why use it?
Delivers high cured mechanical strength, excellent adhesion and resistance to dilute acids, salts, mineral oils and aliphatic hydrocarbons, with a built-in visual mixing check that reduces on-site error.
How is it applied?
Mix the two pre-weighed components until the streaky white/grey blend turns one uniform colour, then trowel or press onto a clean, sound, prepared substrate; its thixotropy lets it hold on vertical faces and soffits without slump.
About Fosroc Nitobond E225
Fosroc Nitobond E225 is a solvent-free, two-component epoxy mortar engineered for situations where an ordinary cementitious patch or a thin bonding slurry simply will not carry the load. Unlike a brush-applied bonding agent, it is supplied as a trowellable, paste-grade epoxy system: a resin base and a hardener that are deliberately pigmented in contrasting white and grey shades. When the two are combined, the streaky appearance disappears only when mixing is complete, giving the applicator an unambiguous, on-site visual confirmation that the product has been correctly blended before it is placed. This single feature removes one of the most common causes of epoxy failure in the field — under-mixed or unevenly mixed material that never reaches full cure.
The product serves two distinct roles. First, it is used for the rigid, solid fixing of steel elements to concrete and precast — anchoring base plates, brackets, dowels, starter bars, cleats and connection hardware where a stiff, gap-filling, structural adhesive is required rather than a pourable grout. Second, it works as a thixotropic repair and strengthening mortar, allowing localised reinstatement of damaged concrete sections and the build-up of material on vertical surfaces and overhead soffits without sagging or slumping. Because it cures to a hard, dimensionally stable mass with high mechanical strength, it is suited to areas that will subsequently carry static and dynamic load.
For Indian contractors, consultants and procurement teams, Nitobond E225 sits in the structural-epoxy family alongside Fosroc’s wider Nitobond and Conbextra ranges. It is most relevant on projects where steelwork meets concrete — industrial sheds and plant rooms, water and wastewater structures, bridges, metro and precast assembly — and where the repair specification calls for a chemical-resistant, high-strength mortar rather than a polymer-modified cementitious one. As a Fosroc authorised distributor and applicator across Delhi NCR and pan-India, Space Arc Engineering can supply the genuine product, confirm the current region-specific technical data sheet and batch values for your tender, and advise on the correct grade for the substrate and exposure in question.
The technical insight
The defining characteristic of Nitobond E225 is that it is a paste-grade thixotropic epoxy mortar, not a low-viscosity bonding liquid — and that distinction drives every specification decision. Thixotropy means the material is stiff at rest but flows under the shear of a trowel, so it stays put on a wall or soffit yet spreads cleanly when worked. This makes it the right tool for non-sag, gap-filling fixing and for building section thickness in a single pass, where a thin epoxy bonding agent (such as Nitobond EP) would simply run off. The contrasting white/grey component colours are a genuine quality-control device: full colour homogeneity is the field indicator that the resin-to-hardener ratio has been properly achieved throughout the mix, which directly governs the ultimate cure and strength. Because epoxy cure is exothermic and temperature-sensitive, working time shortens in Indian summer heat and lengthens in cold — so mixed quantities should be sized to what can be placed within the pot life at the actual site temperature. Substrate condition is decisive: bond is only as good as the prepared surface, so concrete must be sound, clean, dry and laitance-free, and steel must be degreased and abraded to bright metal. Exact numeric figures (strengths, ratio, pot life, coverage) vary by the region-specific Fosroc datasheet revision and should be read off the current TDS for your market before specification.
Where it is used
- Rigid bonding and fixing of steel base plates, brackets, cleats and connection hardware to concrete and precast
- Anchoring and bonding-in of dowels, starter bars and reinforcement into prepared pockets and chases
- Thixotropic patch repair of damaged or spalled concrete on vertical faces and overhead soffits
- Localised section build-up and strengthening of beams, columns and slabs
- Bonding precast concrete elements and segmental units where a stiff structural adhesive is needed
- Repair work in chemically aggressive environments exposed to dilute acids, salt solutions, mineral oils and aliphatic hydrocarbons
Key advantages
- High mechanical strength once hardened, suitable for load-bearing fixings and structural repair
- Excellent adhesion to correctly prepared concrete, precast and steel substrates
- Thixotropic consistency holds on vertical surfaces and soffits without slump or sag
- Contrasting white and grey components give a clear visual confirmation of complete mixing
- Good chemical resistance to dilute acids, salt solutions, mineral oils and aliphatic hydrocarbons
- Solvent-free, two-component system supplied in pre-weighed packs for consistent site mixing
- Backed by Fosroc technical support and available through an authorised India distributor
Limitations & considerations
- Not a pourable grout or a thin brush-applied bonding agent — it is a stiff paste for trowel placement, not deep-pour or slurry use
- Pot life and cure are temperature-dependent; high ambient heat in India shortens working time and demands smaller mixed batches
- Bond strength depends entirely on substrate preparation — weak, dusty, oily, damp or laitance-bearing surfaces will compromise performance
- Resin-to-hardener ratio must be respected; under-mixing or guessing quantities risks incomplete cure
- As an epoxy it can yellow and chalk under prolonged UV, so it is intended for structural use rather than as a finished decorative surface
- Exact published values differ by region and TDS revision, so the current local datasheet must be confirmed before specifying
Selection & best practice
Prepare every substrate before opening a pack: concrete must be sound, clean, dry and free of laitance, dust, oil and curing compound (mechanical roughening or grit-blasting is preferred), and steel must be degreased and abraded to a bright, clean surface. Mix only the quantity that can be placed within the working time at the actual site temperature, and mix the full white and grey components together thoroughly until the streaks vanish and one uniform colour is achieved — that colour change is your acceptance criterion, not a guideline. Work the mortar firmly onto the surface to wet out the substrate and eliminate voids, then build to the required thickness. Protect freshly placed material from water, dust and direct sun during initial cure, and clean tools with the recommended solvent before the resin sets. Always read off the current region-specific Fosroc technical data sheet for exact ratio, pot life, cure times and coverage, and observe the SDS for PPE, ventilation and skin protection.
Specifications
| Product type | Two-component epoxy mortar (resin + hardener) |
| Component colours | White and grey, mixing to a uniform colour for visual mix check |
| Consistency | Thixotropic / non-sag paste; suitable for vertical and overhead application |
| Primary functions | Rigid fixing of steel to concrete/precast; thixotropic repair & strengthening mortar |
| Cured mechanical strength | High (load-bearing); confirm exact N/mm2 values from current regional TDS |
| Adhesion | Excellent to correctly prepared concrete, precast and steel |
| Chemical resistance | Dilute acids, salt solutions, mineral oils, aliphatic hydrocarbons |
| Mixing ratio / pot life | Pre-weighed two-part packs; ratio and pot life per regional datasheet (temperature-dependent) |
| Substrates | Concrete, precast concrete, structural steel (all suitably prepared) |
| Solvent content | Solvent-free system |
Industry use cases
Industrial & manufacturing plants
Fixing machine base plates, equipment brackets and structural steel connections to concrete plinths and floors, including in oil- and chemical-exposed areas.
Water & wastewater infrastructure
Patch repair and section reinstatement of tanks, channels and treatment structures exposed to dilute acids and salt solutions, where a chemically resistant mortar is required.
Bridges & transport infrastructure
Bonding-in of dowels and steel hardware and localised strengthening of beams and deck soffits during rehabilitation, using its non-sag property for overhead work.
Precast & prefabricated construction
Rigid bonding and fixing of precast connection components and steel inserts where a stiff, gap-filling structural adhesive outperforms a pourable grout.
Commercial & industrial buildings
Anchoring cleats, brackets and starter bars and repairing spalled concrete on columns and walls during structural retrofit and remediation.
Frequently asked questions
Is Fosroc Nitobond E225 a bonding agent or a mortar?
Why are the two components coloured white and grey?
Can Nitobond E225 be used overhead and on vertical surfaces?
What surface preparation does it need?
What chemicals can it resist?
Where can I buy genuine Nitobond E225 in India?
How we position Fosroc Nitobond E225
Within the Fosroc range, Nitobond E225 occupies the middle ground between a thin bonding agent and a pourable anchoring grout. It is distinct from Fosroc Nitobond EP, which is a low-viscosity epoxy bonding agent painted onto concrete before fresh concrete or repair mortar is placed; from Nitobond SBR and Nitobond AR, which are polymer-modified cementitious bonding aids and gauging liquids for less demanding, non-chemical exposure; and from the Conbextra EP epoxy grouts and Lokfix anchoring systems used for flowable deep-pour fixing of bolts and bars. Choose E225 when you specifically need a stiff, non-sag, high-strength epoxy mortar for fixing steel or rebuilding a section on a vertical or overhead face. Credible alternatives in the Indian market include Sika’s Sikadur structural epoxy adhesives and mortars (for example the Sikadur-31 family), MBCC/Master Builders Solutions MasterBrace and MasterEmaco epoxy systems, STP Limited’s epoxy adhesives, and Dr. Fixit (Pidilite) structural repair products — though Dr. Fixit’s strength tends to sit in waterproofing and cementitious repair rather than this exact paste-grade epoxy-mortar niche. Final selection should always be made against the current TDS values and the project’s load, exposure and substrate requirements.
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