Fosroc Nitomortar 30
A trowel-grade, solvent-free epoxy repair mortar that restores concrete surfaces exposed to acids, alkalis and industrial chemicals, applied 3-6 mm thick over a Nitoprime 25 primed base.
What is it?
A solvent-free epoxy repair mortar from Fosroc, supplied as a pre-weighed kit with the two-part Nitoprime 25 primer, formulated for thin-section concrete repairs in chemically aggressive environments.
Where is it used?
Chemical plant floors, effluent and process areas, industrial slabs, tank surrounds and any concrete surface where the repair must survive acids, alkalis, fuels and oils rather than ordinary cementitious wear.
Why use it?
It gives a hard, chemically inert, fair-finish patch that bonds tightly to sound concrete and resists the aggressive media that would quickly break down a cement-based repair mortar.
How is it applied?
Prime the prepared surface with Nitoprime 25, mix the pre-weighed resin, hardener and filler, then trowel Nitomortar 30 in a 3-6 mm layer and finish to a granular fair surface.
About Fosroc Nitomortar 30
Fosroc Nitomortar 30 sits in a specific niche: the thin repair that has to shrug off chemicals. Plenty of sites can patch a spalled slab with a cementitious mortar, but the moment the surface is washed with dilute acid, dosed with alkali cleaning agents or splashed with fuel and oil, a cement repair starts to soften and erode. Nitomortar 30 is built for exactly those conditions. It is a solvent-free epoxy system supplied as a pre-weighed kit, so the resin, hardener and graded filler arrive in the right proportions and the crew simply mixes and applies. Because it is trowel grade and intended for a modest build of 3 to 6 mm, it suits the fair-faced reinstatement of surfaces and shallow patches rather than deep structural section loss.
The product is not used alone. Fosroc pairs it with Nitoprime 25, a two-part epoxy primer, which is the step that makes the whole repair durable. The primer wets out the prepared concrete, seals the porous surface and creates the chemical key that the epoxy mortar bonds into. Skip it and you invite the most common failure on aggressive-duty repairs, a patch that looks fine on day one and lifts at the edges a few months later. Applied as a system on clean, sound, primed concrete, Nitomortar 30 cures to a dense, slightly granular surface of uniform self-colour that is unaffected by a wide range of acids, alkalis and industrial chemicals. For engineers specifying repairs in plants where downtime is expensive and re-repair is unacceptable, that chemical stability is the whole point.
The technical insight
The performance comes from the epoxy chemistry rather than any hydraulic reaction. In a cement mortar, strength develops as cement hydrates, and that same calcium-rich matrix is what acids attack and dissolve. Nitomortar 30 has no such matrix to lose. Its epoxy resin cross-links with the amine hardener into a tightly bonded, three-dimensional polymer network that is inherently inert to acids, alkalis, fuels and oils, while the graded filler carries load and controls shrinkage. Chemical resistance is therefore a property of the cured polymer itself, not a surface treatment that can wear away. Two consequences matter on site. First, adhesion is created mechanically and chemically at the Nitoprime 25 interface, so surface preparation and priming govern the result far more than they would with a cement repair. Second, an epoxy patch is stiffer and expands and contracts differently from the surrounding concrete, so it is deliberately kept thin (3-6 mm) to keep interface stresses low and let the bond, not the bulk, do the work.
Where it is used
- Fair-faced repair of chemically attacked concrete floors in process and effluent areas
- Thin-section patch repair of industrial slabs exposed to acids, alkalis and solvents
- Reinstatement of spalled or eroded surfaces around tanks, bunds and drainage channels
- Repair of concrete in chemical plants, dairies, breweries and food-processing areas
- Surface reinstatement where a hard, chemically inert finish is required over sound concrete
- Bedding and making-good of small areas in aggressive industrial environments
- Localised repairs on floors that will later receive a chemical-resistant coating or screed
- Restoration of trafficked concrete surfaces that ordinary cementitious mortars cannot survive
Key advantages
- Solvent-free epoxy formulation that is unaffected by a wide range of acids, alkalis and industrial chemicals
- Supplied as a pre-weighed kit with matched Nitoprime 25 primer, removing on-site batching guesswork
- Trowel-applied for straightforward hand placement without specialist plant
- Cures to a hard, dense, fair finish with a uniform granular texture
- Strong bond to sound, primed concrete for durable, long-lasting repairs
- Ideal for thin 3-6 mm reinstatement where cementitious mortars would erode
- High early strength gain that minimises downtime in working plants
- Chemically inert cured surface that resists the aggressive media found in industrial settings
Limitations & considerations
- Intended for thin 3-6 mm build, not deep structural section loss – use a high-build epoxy or micro-concrete for those
- Requires Nitoprime 25 priming of a clean, sound, dry substrate; the repair fails if this step is skipped or rushed
- Epoxy has a different thermal movement from concrete, so large or thick patches risk interface stress
- Pot life is limited and shortens sharply in hot Indian site conditions, so only mix what can be placed quickly
- Colour matching to the parent concrete is not practicable because of natural aggregate variation
- More expensive than cementitious repair mortars, so best reserved for genuinely chemical-duty repairs
Selection & best practice
Success is decided at the substrate. Break out to sound, clean concrete, remove all laitance, dust, oil and previous coatings, and ensure the surface is dry and free of contamination before you start. Prime the prepared area thoroughly with Nitoprime 25 and apply the mortar within the primer’s recommended overcoat window while it is still tacky, not after it has fully cured. Mix the full pre-weighed kit; do not split packs by eye, as the resin-to-hardener ratio is fixed for a reason. Trowel Nitomortar 30 in a 3-6 mm layer, working it firmly into the primed surface to expel air and consolidate against the edges, then finish to the required fair texture. In warm weather keep material shaded and mix only what the crew can place before the pot life expires, because heat cuts working time significantly. Protect the fresh repair from water, contamination and traffic until it has hardened, and allow full cure before returning the area to chemical service.
Specifications
| Product type | Solvent-free epoxy repair mortar (resin, hardener and graded filler) |
| Supplied as | Pre-weighed kit with Nitoprime 25 two-part epoxy primer |
| Application method | Trowel applied by hand |
| Applied thickness | 3-6 mm (depending on requirement) |
| Primer | Nitoprime 25 (two-part epoxy resin primer) |
| Chemical resistance | Unaffected by a wide range of acids, alkalis and industrial chemicals |
| Finish | Fair finish, slightly granular texture, uniform self-colour |
| Colour matching | Not practicable due to natural aggregate variation |
Industry use cases
Chemical & Process Plants
Reinstating floor and bund surfaces attacked by dilute acids, alkalis and solvents where a cement repair would not last.
Food, Dairy & Beverage
Patching washdown floors exposed to lactic and organic acids, cleaning chemicals and constant wet-duty in hygiene-critical areas.
Effluent & Water Treatment
Repairing concrete around tanks, channels and drainage runs that see aggressive chemical and biological loading.
Heavy Industrial Flooring
Making good spalled or eroded slab surfaces in plants where fuels, oils and chemicals rule out ordinary repair mortars.
Coating Preparation
Providing a sound, chemically compatible base repair on concrete that will subsequently receive a protective floor coating.
Frequently asked questions
Is Nitomortar 30 a structural repair mortar?
Do I have to use Nitoprime 25 with it?
How thick can I apply it in one pass?
What chemicals does the cured mortar resist?
Will the repair match the colour of my existing concrete?
Can Space Arc supply Nitomortar 30 across India?
How we position Fosroc Nitomortar 30
Nitomortar 30 is Fosroc’s answer for thin, chemical-resistant surface repairs, and it works as a system with Nitoprime 25 primer. Where the damage is deeper or a high-strength structural patch is needed, step up to Fosroc Nitomortar S, a three-component high-strength, abrasion-resistant epoxy mortar. For pinholes and blowholes ahead of a coating, Nitomortar FC epoxy fairing coat is the right partner rather than a full mortar. If the repair is large-volume or better suited to a cementitious system, our Renderoc range of polymer-modified repair mortars from Fosroc is the practical alternative. Across our other brands, teams needing chemical-duty flooring often combine these repairs with epoxy or PU floor coatings from Sika or Dr. Fixit, and where a general concrete bonding agent is wanted, Fosroc Nitobond EP is commonly specified alongside. Space Arc can advise on the right combination for each site.
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